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<h3>Job Description</h3>
Job Description
At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.
At Klaviyo, we love tackling tough engineering problems and look for engineers who specialize in certain areas but are passionate about building, owning &amp; scaling features end to end from scratch and breaking through any obstacle or technical challenge in their way. We push each other to move out of our comfort zone, learn new technologies and work hard to ensure each day is better than the last.

Team Overview:
Klaviyo operates a real-time data analytics platform coded primarily in Python that is built for massive scale and hosted on Amazon Web Services (AWS). The teams in the Data Platform area work with large scale distributed systems and databases to power core Klaviyo functionality and generate data-driven insights. As an engineering manager in this area, you will be responsible for leading a team to design, build, and maintain systems that support other engineering teams and departments across Klaviyo.
Team Tech Stack:
<ul>
<li>AWS</li>
<li>Python</li>
<li>Java</li>
<li>Iceberg</li>
<li>Spark</li>
<li>Kafka</li>
<li>Flink</li>
<li>Airflow</li>
<li>Terraform</li>
<li>DataHub</li>
<li>Kubernetes</li>
<li>ClickHouse</li>
<li>MySQL</li>
</ul>
How You'll Make a Difference
<ul>
<li>You will be responsible for leading and managing a team of 8-10 engineers to deliver high impact work.</li>
<li>Responsible for coaching engineers, managing/reviewing technical documentation, and articulating a phased approach to achieving the team's overall technical vision.</li>
<li>Be responsible for the mission, technical direction, and operations of projects that have immediate impact.</li>
<li>Owning the systems that make our data discoverable and usable to power features that 50,000+ customers rely on daily to reach 4B+ consumers to drive their business forward.</li>
<li>Partnering with teams across the company to help them manage and leverage petabytes of data.</li>
</ul>
Who You Are
<ul>
<li>BA or BS Degree in Computer Science, related field, or equivalent experience</li>
<li>8+ years of software engineering in a DevOps environment with specific experience in data processing systems.</li>
<li>3+ years of people management experience</li>
<li>Experience writing code using best practices in a language such as Python, Java, Go, etc.</li>
<li>Experience designing, building, and operating reliable, fault-tolerant, and high performance distributed systems</li>
<li>Proven ability to come up to speed quickly</li>
<li>You've already experimented with AI in work or personal projects, and you're excited to dive in and learn fast. You're hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient.</li>
</ul>
 
We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.
Please see the independent bias audit report covering our use of Covey here
Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.
Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant's job-related skills, relevant experience, education or training, and work location.
In addition to base salary, our total compensation package may include participation in the company's annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. 
Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.
Base Pay Range For US Locations:$188,000—$282,000 USD
Get to Know Klaviyo
We're Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we're developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you're ready to do the best work of your career, where you'll be welcomed as your whole self from day one and supported with generous benefits, we hope you'll join us.
AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. 
By participating in Klaviyo's interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our Job Applicant Privacy Notice. 
Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls.By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

Engineering Manager, Data Platform

<h3>Job Description</h3>
Job Description Apply now: Data Analyst, location is Hybrid (Waltham, MA). The start date is ASAP for this permanent position.
 Job Title: Data Analyst Location-Type: Hybrid (3 days in-office) – Waltham, MA Start Date Is: ASAP Duration: Permanent Compensation Range: $85,000/year
 Job Description:
 The Data Analyst will analyze, interpret, and visualize data to provide actionable insights that drive strategic business decisions. This role collaborates with cross-functional teams, develops reports and dashboards, and ensures data accuracy.
 Day-to-Day Responsibilities:
<ul>
<li> Analyze, interpret, and visualize data to support business decisions</li>
<li> Collaborate with business stakeholders and IT teams</li>
<li> Develop and maintain dashboards and reports (Power BI)</li>
<li> Conduct data validation to ensure accuracy and consistency</li>
<li> Support AI implementation by quantifying data</li>
<li> Optimize SQL queries and ETL processes</li>
<li> Take ownership of databases and documentation</li>
<li> Engage in continuous learning and mentorship</li>
</ul>
 Requirements: Must-Haves:
<ul>
<li> 1-2 years of experience in a Data Analyst or related role</li>
<li> Strong SQL and Python skills (immediate proficiency required)</li>
<li> Proficiency in Power BI and DAX language</li>
<li> Passion for coding, AI, and development</li>
<li> QA-focused mindset with attention to documentation and database management</li>
<li> Ability to quantify data for AI applications</li>
<li> Strong problem-solving and technical explanation skills</li>
<li> Experience with RAG (Retrieval-Augmented Generation)</li>
</ul>
 Nice-to-Haves:
<ul>
<li> Exposure to statistical analysis and machine learning</li>
<li> Experience in a mid-sized, fast-paced company</li>
</ul>

Data Analyst

<h3>Job Description</h3>
Job Description
At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.
Founded in 2012, Klaviyo was built around data processing and analytics from the start. Over the years our data foundation has evolved to a multi-tier architecture, supporting transactional access, real-time analytics, and off-line data processing jobs at multi-petabyte scale. As Klaviyo diversifies and moves up-market, and as the pace of machine learning advancement increases, the requirements on and importance of the data platform continue to rapidly grow. Our team has a wide mix of talents and experience, and we are uniquely positioned to advance the state of the practice by applying what we have learned in the past to the challenges of the future.
As Head of Data Platform, you will report directly to the VP of Data Infrastructure Engineering. You will own the data lake, on-line analytics systems, data ingestion and movement, query processing, automation, compliance, and other related areas, and will coordinate the efforts of those teams to build our next generation of data platform that meets our scale, performance, reliability, and flexibility requirements.
How you'll make a difference:
Your work will be foundational, enabling machine learning (ML), artificial intelligence (AI), business intelligence (BI), and advanced analytics (AA) product features across the organization, while directly contributing to Klaviyo's strategic growth in the mid-market (MM+) segment and expansion into new verticals. You will do this by leading teams to build a data platform that is accessed through a clear and cohesive set of APIs which could enable it to become a product itself.
<ul>
<li>Drive Vision &amp; Strategy: Lead the strategic planning, architectural design, and execution for the Data Platform, ensuring alignment with overall company objectives to dominate retail marketing and productize AI agents.</li>
<li>Build Foundational Data Capabilities: Oversee the development of core data structures, including a Common Data Model (CDM), unified data collection via Change Data Capture (CDC), and a scalable Key Value Store (KVS), serving as the bedrock for flexible data models and future innovations.</li>
<li>Enhance Data Access &amp; Performance: Lead efforts to significantly improve data discovery, exploration, querying capabilities, and reducing processing times for ML, BI, and analytical use cases.</li>
<li>Scale for Growth: Ensure the platform's scalability and reliability to support multiple customers with over 100M profiles by 2026, improving event processing, and reducing profile ingest times, all while controlling costs.</li>
<li>Improve Data Quality &amp; Governance: Champion initiatives for data quality, transactional consistency, GDPR compliance, and rigorous data governance, including data access control and operating in multiple geographies.</li>
<li>Foster Internal &amp; External Partnerships: Collaborate closely with internal teams (Data Science, BI, Product Analytics, Application Developers) and prepare for externalizing data platform services for third-party developers.</li>
</ul>
Who you are: 
<ul>
<li>Deep Technical Expertise: Extensive experience in designing, building, and operating large-scale data platforms, distributed systems, and data warehousing solutions. Experience working with technologies such as Kafka, Iceberg, Snowflake, Airflow, Clickhouse, MySQL/Postgres, etc.</li>
<li>Strategic Leadership: Proven ability to define and execute complex technical strategies, manage trade-offs, and secure cross-organizational commitment for foundational initiatives.</li>
<li>Team &amp; Organizational Development: Experience in leading and growing high-performing engineering teams, fostering a culture of ownership, innovation, and operational excellence.</li>
<li>Problem-Solving Acumen: A track record of identifying critical pain points in data management (e.g., data silos, performance bottlenecks, cost inefficiencies) and delivering impactful solutions.</li>
<li>Customer-Centric Mindset: An understanding of how data infrastructure directly impacts customer experience, product adoption, and business revenue.</li>
</ul>
 
We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.
Please see the independent bias audit report covering our use of Covey here
Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.
Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant's job-related skills, relevant experience, education or training, and work location.
In addition to base salary, our total compensation package may include participation in the company's annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. 
Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.
Base Pay Range For US Locations:$248,000—$372,000 USD
Get to Know Klaviyo
We're Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we're developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you're ready to do the best work of your career, where you'll be welcomed as your whole self from day one and supported with generous benefits, we hope you'll join us.
AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. 
By participating in Klaviyo's interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our Job Applicant Privacy Notice. 
Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls.By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

Director of Engineering - Data Platform

<h3>Job Description</h3>
Job Description
 Apply now: Software Engineer, location is Hybrid. The start date is ASAP (May 13th) for this permanent position.
 Job Title: Software Engineer Location-Type: Hybrid (3 days onsite – Andover, MA / 2 days remote) Start Date Is: ASAP (May 13th) Duration: Permanent Compensation Range: $135,000 – $150,000 base 12% bonus
 Job Description: Join a cross-functional team driving the design and implementation of new features within a clinical systems product, with a heavy focus on C development and risk mitigation.
 Day-to-Day Responsibilities:
<ul>
<li>
 Partner with clinical and systems engineers to understand feature requirements
</li>
<li>
 Drive documentation and high-level design discussions
</li>
<li>
 Propose, mature, and implement new features using C 
</li>
<li>
 Identify and mitigate risks throughout development
</li>
<li>
 Pull and analyze data to inform feature development
</li>
<li>
 Debug and investigate field issues
</li>
<li>
 Work independently and proactively with various teams
</li>
</ul>
 Requirements:
<ul>
<li>
 Must-Haves:
<ul>
<li>
 8 years of experience (staff level)
</li>
<li>
 Strong C programming skills
</li>
<li>
 BS in Computer Science or Electrical Engineering
</li>
<li>
 Working knowledge of IEC 62304
</li>
<li>
 Experience with Class II or III medical devices
</li>
<li>
 Proven documentation skills and systems-level thinking
</li>
<li>
 Excellent communication and self-starting attitude
</li>
</ul>
</li>
<li>
 Nice-to-Haves:
<ul>
<li>
 Passion for developing innovative device features
</li>
<li>
 Data analysis for feature development
</li>
<li>
 Interest in system-wide improvements and collaboration
</li>
</ul>
</li>
</ul>

Software Engineer

<h3>Job Description</h3>
Job Description
At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.
Why You Should Join the Billing Team:
The Billing team at Klaviyo is at the heart of how we deliver value to our customers and drive revenue for the business. We're responsible for everything from pricing and payments to product entitlements. Our systems ensure customers are billed accurately and have access to the features they've selected. As Klaviyo expands globally and launches new product offerings, our team plays a pivotal role in enabling speed, flexibility, and scale across the company.
As an Lead Software Engineer on this team, you'll lead a group of engineers focused on building internal platforms that empower teams across Klaviyo to self-serve product packaging, entitlements, and billing logic. You'll oversee work to build a pricing and packaging platform, and to build scalable infrastructure that supports international growth. This is a hands-on leadership role where you'll contribute to code, design, and strategy. Your work will directly enable faster product launches, better customer experiences, and improved business outcomes.
How You Will Make a Difference:
<ul>
<li>Lead a team of engineers building a new internal pricing and billing platform</li>
<li>Own Klaviyo's 3rd party payment and billing integrations and expand payment capabilities</li>
<li>Build scalable systems to support international markets and payment flexibility</li>
<li>Contribute directly to architecture and code, driving best practices and quality</li>
<li>Collaborate with cross-functional teams to unlock product revenue opportunities</li>
<li>Grow and mentor engineers while helping shape the future of billing at Klaviyo</li>
<li>Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up.</li>
</ul>
Who You Are:
<ul>
<li>8+ years of engineering experience with strong backend skills (Python or similar)</li>
<li>Comfortable coding and reviewing complex systems — this is a hands-on role</li>
<li>Experience with fullstack development (React familiarity is a plus)</li>
<li>Proven experience with third-party APIs, especially Stripe or payment systems</li>
<li>Skilled in system design and scaling infrastructure using AWS</li>
<li>Experience building developer platforms or internal tooling is a strong plus</li>
<li>Clear communicator and collaborative team player</li>
<li>You've already experimented with AI in work or personal projects, and you're excited to dive in and learn fast. You're hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient.</li>
</ul>
Technologies We Use:
<ul>
<li>Python, Django</li>
<li>React, TypeScript</li>
<li>Stripe API, RESTful integrations</li>
<li>AWS, Terraform, Redis, MySQL </li>
</ul>
Location:
This is a hybrid role based in Boston, with 3 days in office and 2 days remote per week.

We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.
Please see the independent bias audit report covering our use of Covey here
Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.
Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant's job-related skills, relevant experience, education or training, and work location.
In addition to base salary, our total compensation package may include participation in the company's annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. 
Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.
Base Pay Range For US Locations:$188,000—$282,000 USD
Get to Know Klaviyo
We're Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we're developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you're ready to do the best work of your career, where you'll be welcomed as your whole self from day one and supported with generous benefits, we hope you'll join us.
AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. 
By participating in Klaviyo's interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our Job Applicant Privacy Notice. 
Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls.By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

Lead Software Engineer - Billing

<h3>Job Description</h3>
Job Description
 Apply now: Sr. Software Developer (SuccessFactors), location is Remote (EST/CST preferred). The start date is 3 weeks from offer for this 6-month contract-to-hire position.
 Job Title: Sr. Software Developer (SuccessFactors) Location-Type: Remote (EST hours; EST/CST candidates preferred) Start Date Is: 3 weeks from offer (includes background check) Duration: 6-month contract-to-hire Compensation Range: $60-$65/hour W2
 Job Description: The Sr. Software Developer (SuccessFactors) will be responsible for developing and integrating Korn Ferry's digital products with SAP SuccessFactors and Workday. The role requires a hands-on approach to development while also contributing to functional requirements gathering and implementation.
 Day-to-Day Responsibilities:
<ul>
<li> Develop and integrate applications with SuccessFactors.</li>
<li> Work with third-party vendors on end-to-end integration.</li>
<li> Handle infrastructure, integration support, and coding aspects.</li>
<li> Maintain and enhance integration features for the SuccessFactors marketplace.</li>
<li> Gather and analyze functional requirements.</li>
<li> Collaborate with internal teams for development and deployment.</li>
</ul>
 Requirements:
 Must-Haves:
<ul>
<li> 6-7 years of experience in software development.</li>
<li> Strong experience integrating with SAP SuccessFactors.</li>
<li> Hands-on coding and development experience.</li>
<li> Experience with packaged solutions and database structures within SuccessFactors.</li>
<li> Working with third-party vendors for integration projects.</li>
<li> Bachelor's degree in Computer Science or related field (or equivalent experience).</li>
<li> Backend development experience, including SFTP/API integration.</li>
<li> Experience with SuccessFactors modules such as Talent Management and Payroll.</li>
<li> Understanding of object-oriented programming and relational databases.</li>
</ul>
 Nice-to-Haves:
<ul>
<li> Experience with ReactJS.</li>
<li> Prior experience in developing apps for the SuccessFactors marketplace.</li>
<li> Experience working in Agile teams.</li>
</ul>

SuccessFactors Software Developer

<h3>Job Description</h3>
Job Description
At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.
Team Overview 
The Integrations team is responsible for building and maintaining Klaviyo's integrations to a variety of 3rd party vendors. These vendors can be grouped across a number of industries such as ecommerce, point of sale, payment processing, advertising, and fundraising. In order to enable our customers to integrate with these different vendors we provide easy-to-use interfaces that guide our customers through the setup and management of an integration. Behind the scenes, we use a variety of pipelines to process data flowing to and from these vendors at scale. We collaborate closely with internal stakeholders and have substantial exposure to Klaviyo's customers, including businesses, partners, and third-party developers.

How you'll make an impact
The Integrations team operates at the intersection of distributed systems, software architecture data mapping &amp; pipelining, scalability, and reliability. As a Software Engineer, you will help us build thousands of integrations across various verticals in a fast, flexible, efficient, and maintainable way, resulting in world class customer and developer experiences. Critical components of the Integrations space include Klaviyo's V3 APIs, 3rd party vendor's APIs, inbound and outbound data pipelines, and data mapping and transformation. You will have an opportunity to learn our existing end-to-end integration workflow and help scale it up to support the next evolution of Klaivyo's growth into several verticals beyond e-commerce. You'll work closely with a team of talented software engineers, data scientists, product managers, and UX/UI designers who are eager to make the process of integrating with Klaviyo fast, efficient, and seamless. Your skills as a software engineer, outside-the-box thinking, and execution will help shape Klaviyo's trajectory for the next decade.

Who you are
<ul>
<li>You are passionate about building software effectively and for the long-term. </li>
<li>You have 4+ years of hands-on software development experience creating and maintaining highly available, full-stack SaaS products at scale.</li>
<li>Bachelor's degree or equivalent.</li>
<li>A good understanding of the Integrations technical space - 3rd party APIs, authentication, storage, and data pipelines.</li>
<li>You have an in-depth understanding of commonly used web architecture design patterns when it comes to highly scalable systems. </li>
<li>You have been a successful interface between the team and the rest of your product area. You have been responsible for owning and delivering projects or features of projects including design, development, and deployment.</li>
<li>You possess excellent verbal and written communication skills. Through effective proactive communication and planning, you keep your team up to date on project progress and any blockers or delays.</li>
<li>You like to question convention, proactively find ways to innovate, and are intrinsically motivated to drive incremental improvements that deliver value to the business.</li>
<li>You like working on small, autonomous agile teams. Enjoy shipping code early and often in an agile fashion, pairing with product management, business stakeholders, and other engineers to craft better software.</li>
<li>You have a good understanding of popular AI tools (ChatGPT, Claude Code, Cursor, Gemini, etc.) and know how to use them effectively in your own day-to-day workflow to increase coding and productivity efficiency.</li>
<li>You enjoy working with new technologies ranging from the frontend to backend, and are particularly passionate and an expert in various tech stacks.</li>
<li>Ability to dig into performance and scalability issues to drive breakthrough solutions-- whether it's a slow loading UI or too many clicks in a workflow, a database query timing out, or a queue that just won't drain.</li>
<li>You like creating, teaching, and improving shared engineering processes. </li>
<li>You are successfully able to estimate and manage project timelines and risks to ensure the team will be in a position to deliver on its commitments.</li>
<li>You are proficient in writing technical specifications and documents based on product feature specifications provided by the Product team, and are adept at breaking down and articulating complex technical concepts in a clear and concise manner.</li>
<li>You are capable of leading discussions and presentations to ensure alignment on architectural decisions, promoting transparency, and facilitating a shared understanding across teams. </li>
<li>Highly collaborative, ambitious, and ability to champion ideas based on merit. At the same time, being humble enough to recognize your own areas of improvements and open to feedback and continuous learning.</li>
<li>You've already experimented with AI in work or personal projects, and you're excited to dive in and learn fast. You're hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient.</li>
</ul>
What You'll do:
<ul>
<li>Have an opportunity to make a major impact on the direction and priorities of the Integrations team - wholly owning features that 160,000+ customers rely on daily to reach 4B+ consumers to drive their business forward.</li>
<li>Be responsible for the mission, technical direction and operations of projects that have immediate impact.</li>
<li>Responsible for building and managing Klaviyo's integrations, integration settings pages, API services that communicate with 3rd-party vendor APIs, data transformation of data flowing between Klaviyo and the 3rd-party vendors, as well as wiring up the API Services into a number of data pipelines.</li>
<li>Helping architect and design robust and high performance data processing and storage systems to serve different internal and external use cases.</li>
<li>Build prototypes, establishes design patterns, consults with domain experts and otherwise wors to ensure a team's successful delivery of technical solutions.</li>
<li>Contribute to the Klaviyo R&amp;D team as a subject matter expert in multiple areas.</li>
<li>Provide quality PR reviews for our code-owned areas of the application.</li>
<li>Lead by example and help improve engineering processes and workflows within the Integrations space as well in the wider engineering community.</li>
</ul>

Tech Stack:
Klaviyo operates a real-time data analytics platform coded primarily in Python that is built for massive scale and hosted on Amazon Web Services (AWS). New hires come to Klaviyo from a number of disciplines with experience in a variety of languages and tech stacks. Here is our primary tech stack:
<ul>
<li>Python / Django </li>
<li>Typescript / React</li>
<li>MySQL / Redis / Memcached</li>
<li>RabbitMQ / Celery / Apache Kafka / Apache Pulsar</li>
<li>Kubernetes</li>
<li>AWS</li>
</ul>
At Klaviyo, we love tackling tough engineering problems and look for employees who are passionate about building, owning, and scaling features end-to-end and breaking through obstacles or technical challenges in their way. We push each other to move out of our comfort zone, learn new technologies, and work hard to ensure each day is better than the last. 
Klaviyo is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at <a href="https://klaviyo.tech" target="_blank">https://klaviyo.tech</a>

We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.
Please see the independent bias audit report covering our use of Covey here
Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.
Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant's job-related skills, relevant experience, education or training, and work location.
In addition to base salary, our total compensation package may include participation in the company's annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. 
Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.
Base Pay Range For US Locations:$120,000—$180,000 USD
Get to Know Klaviyo
We're Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we're developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you're ready to do the best work of your career, where you'll be welcomed as your whole self from day one and supported with generous benefits, we hope you'll join us.
AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. 
By participating in Klaviyo's interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our Job Applicant Privacy Notice. 
Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls.By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

Software Engineer II, New Verticals/Integrations

<h3>Job Description</h3>
Job Description
At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.
Lead AI Engineer
At Klaviyo, we believe the future of software lies not in productivity tools for human users but in systems that can learn, run, and optimize themselves based on measurable outcomes. We've built the infrastructure and applications that power the interface between businesses and consumers — supporting over 167,000 customers, billions of consumer profiles, and hundreds of billions of customer interactions.
Now, we're building the next generation of AI and machine learning technologies to power these products — enabling AI agents that can automatically create, execute, and optimize marketing and customer experience strategies for any business.
As a Lead AI Engineer, you'll take ownership of designing, building, and scaling the backend and machine learning systems that form the foundation of Klaviyo's AI strategy. You'll partner closely with product managers, data scientists, and engineers to deliver intelligent, outcome-driven systems that operate at massive scale — while mentoring others and setting technical direction for the team.
How You Will Make a Difference
<ul>
<li>Lead the design and development of backend and ML systems that scale to serve 167K+ customers. </li>
<li>Build robust, reliable, and efficient data processing and model-serving pipelines that power production ML models. </li>
<li>Develop and optimize predictive systems (e.g., conversion likelihood, engagement ranking, personalization, anomaly detection). </li>
<li>Architect systems and services that enable our AI agents to learn and improve autonomously from reward or outcome signals. </li>
<li>Collaborate cross-functionally to translate business challenges into scalable, measurable ML solutions.</li>
<li></li>
<li>Collaborate with software engineers and product managers to turn predictive models into intuitive product features for our customers. </li>
<li>Mentor engineers and help evolve Klaviyo's ML engineering best practices, tooling, and architecture. </li>
<li>Foster a culture of ownership, experimentation, and data-driven innovation across teams. </li>
</ul>
Who You Are
<ul>
<li>7–10 years of experience in machine learning engineering or applied software engineering, with a focus on classical ML and predictive modeling. </li>
<li>Deep understanding of supervised learning methods such as random forests, XGBoost, logistic regression, and ensemble techniques. </li>
<li>Proven track record of building and scaling production-grade ML systems end to end (data pipelines, training, deployment, and monitoring). </li>
<li>Experienced backend engineer comfortable with distributed systems and high-scale architectures. </li>
<li>Proficient in Python and modern frameworks (FastAPI, Django preferred). </li>
<li>Skilled with big data and streaming technologies (Apache Spark, Kafka, Hadoop). </li>
<li>Hands-on with asynchronous processing and distributed task queues (Celery, SQS, RabbitMQ, Redis). </li>
<li>Strong understanding of databases and ORMs (SQLAlchemy, Alembic) and cloud-native architectures (AWS, Kubernetes, CI/CD). </li>
<li>Excellent communicator who can set technical direction, influence product strategy, and mentor junior engineers. </li>
<li>Curious, pragmatic, and passionate about building AI systems that drive measurable business impact. </li>
</ul>
Nice to Have
<ul>
<li>Experience training and deploying ML models in production environments that generated measurable impact. </li>
<li>Familiarity with reinforcement learning or agentic AI systems that adapt based on outcome or reward signals. </li>
</ul>

We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.
Please see the independent bias audit report covering our use of Covey here
Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.
Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant's job-related skills, relevant experience, education or training, and work location.
In addition to base salary, our total compensation package may include participation in the company's annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. 
Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.
Base Pay Range For US Locations:$188,000—$282,000 USD
Get to Know Klaviyo
We're Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we're developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you're ready to do the best work of your career, where you'll be welcomed as your whole self from day one and supported with generous benefits, we hope you'll join us.
AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. 
By participating in Klaviyo's interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our Job Applicant Privacy Notice. 
Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls.By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

Lead AI Software Engineer

<h3>Job Description</h3>
Job Description
Reports To: Director of Data &amp; AI Product Partners With: Product, Engineering, Data Science, and Growth teams Salary Range: $80,000–$120,000 per year Location/Schedule: Downtown Boston; 2–3 days/week in-office
About AdeptID
AdeptID is building the AI-first Talent Company to solve talent shortages at scale. Our talent matching APIs (Candidate Match, Candidate Search, Job Search) are embedded in ATS, HCM, and job boards, powering 8–10 million job recommendations per month.
This API-first strategy generates training data, strengthens our models, and advances our mission to match every person to the right job. Many ATS platforms have tried to build their own search and match, only to learn it is slower, costlier, and riskier than expected. AdeptID has shown early partners that our APIs are better, safer, faster to implement, and far cheaper than repeated in-house initiatives.
Role Overview
<ul>
<li>Own end-to-end enterprise implementations of our AI platform: gather requirements, develop POCs, lead onboarding, and drive customer value from initial setup to launch and beyond.</li>
<li>Be the primary technical and product partner for a select group of high-value customers, ensuring their success while advocating for their needs internally</li>
<li>Serve as the voice of the customer to the product team, helping to shape our roadmap and create features that solve real-world hiring and talent matching challenges.</li>
<li>Support the sales process by developing prototypes and demonstrating product value in high-stakes client conversations.</li>
<li>Innovate and document processes that make future implementations easier, faster, and more impactful.</li>
<li>Build hands-on expertise with production-grade AI systems, gaining experience with APIs, data integration, and real-world model deployment.</li>
</ul>
What You Bring
<ul>
<li>5+ years of relevant experience. That might be in software implementation, solutions or sales engineering, product enablement, technology consulting, or another relevant function.</li>
<li>Exceptional communication skills and the ability to build trust with both technical and non-technical stakeholders at a range of seniority levels.</li>
<li>Proficiency in Python. You'll be working with dataframes, JSON files, RESTful APIs, Snowflake databases, and more - mostly via Jupyter Notebooks in VSCode. You won't be building production software, but will be analyzing large volumes of data and developing POCs.</li>
<li>An ability to "figure it out" - our team members use ChatGPT, tutorials, and other resources to learn new skills daily.</li>
<li>Strong technical curiosity and eagerness to grow expertise in AI and scalable product solutions.</li>
<li>Excellent problem-solving skills, with experience translating business needs into technical outcomes.</li>
<li>Self-motivated and adaptable, thriving in a fast-paced, early-stage environment</li>
<li>Experience in HR tech is a plus.</li>
</ul>
Why Join Now
<ul>
<li>Adept's API business already powers millions of matches each month.</li>
<li>Early partners have validated that Adept's matching is better, faster, safer, and cheaper than in-house efforts.</li>
<li>We are combining our API business with an AI-first staffing business, creating a unique position in the market: infrastructure + direct placement at scale.</li>
</ul>

Solutions Engineer

<h3>Job Description</h3>
Job Description
At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you're a close but not exact match with the description, we hope you'll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.
Team Overview:
The Advanced Reporting team is building the next generation of analytics tools that provide Klaviyo customers with actionable, data-driven insights. This team is responsible for designing and developing our advanced reporting experiences that empower our users to understand marketing performance, identify trends, and make smarter business decisions. As our customers' data needs grow more complex, the Advanced Reporting team plays a crucial role in transforming massive datasets into scalable, intuitive, and powerful visualizations. You will lead a team working at the intersection of big data, sophisticated frontend interfaces, and scalable backend systems.
How You Will Make a Difference:
You will lead a team of talented engineers to deliver high-impact, customer-facing analytics features used by more than 160,000 businesses. Your technical leadership will directly shape the future of Klaviyo's reporting capabilities, helping our customers' data into clear, actionable strategies.
<ul>
<li>Lead, grow, and mentor a team of full-stack engineers, fostering a high-performance and inclusive team culture. </li>
<li>Drive the technical vision for our advanced reporting features, ensuring our systems are scalable, reliable, and performant.</li>
<li>Collaborate closely with Product and Design to translate a strategic vision into technical execution and exceptional user experiences.</li>
<li>Coordinate and collaborate with teams across Klaviyo to ensure we deliver the most value to our customers.</li>
<li>Own the systems that make our customers' data discoverable and usable, powering insights that businesses rely on daily to drive their growth. </li>
<li>Contribute to code reviews, design discussions, and the continuous improvement of our engineering processes and technical excellence.</li>
<li>Represent your team in broader architectural discussions and help maintain a high technical bar across the organization. </li>
</ul>
Who You Are:
You are a passionate leader who is motivated to build great products and high-performing teams. You have a proven track record of delivering complex, data-intensive applications in a fast-paced, product-led environment.
<ul>
<li>8+ years of software engineering experience with strong frontend and/or backend skills.</li>
<li>2+ years of engineering management experience leading productive, high-functioning teams. Ideally managing fullstack, product delivery teams.</li>
<li>Comfortable leading teams that contribute to backend systems using Python (or equivalent).</li>
<li>Skilled in system design and architecture, particularly for building reliable and scalable analytics platforms.</li>
<li>An excellent communicator and collaborator who can align the team and stakeholders behind a shared vision.</li>
<li>Experience with agile methodologies and a passion for shipping code early and often.</li>
<li>You have a strong understanding of popular AI tools (ChatGPT, Claude Code, Cursor, Gemini, etc.) and know how to use them effectively in your own day-to-day workflow as well as having your teams effectively use them for high productivity. </li>
</ul>
Technologies We Use:
Our platform is coded primarily in Python and is built for massive scale on Amazon Web Services (AWS). While we look for engineers who have experience in our stack, we are always open to those who come from different disciplines and are eager to learn. 
<ul>
<li>React, TypeScript</li>
<li>Python, Django</li>
<li>MySQL, Redis</li>
<li>Kafka, RabbitMQ</li>
<li>AWS, Kubernetes, Terraform </li>
</ul>
Hybrid role out of our Boston office. 
 
We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.
Please see the independent bias audit report covering our use of Covey here
Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.
Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant's job-related skills, relevant experience, education or training, and work location.
In addition to base salary, our total compensation package may include participation in the company's annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. 
Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.
Base Pay Range For US Locations:$188,000—$282,000 USD
Get to Know Klaviyo
We're Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we're developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you're ready to do the best work of your career, where you'll be welcomed as your whole self from day one and supported with generous benefits, we hope you'll join us.
AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. 
By participating in Klaviyo's interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our Job Applicant Privacy Notice. 
Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.
IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls.By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

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