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.
We love tackling tough engineering problems and look for Engineers who specialize in certain areas but are passionate about building, owning & 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.
Klaviyo operates a real-time data platform built for massive scale on Amazon Web Services (AWS). Engineers come to Klaviyo with experience in a variety of languages and from a number of disciplines.
**This role is based in Boston and requires working onsite three days per week**Software Engineer II — EventsBoston, MA (Hybrid)
Klaviyo’s Core Data Platform is built on three foundational concepts: Profiles, Objects, and Events. Events represent the actions taken by customers’ end users and are the backbone of Klaviyo’s platform — powering segmentation, flows, analytics, and an expanding set of AI-driven features.
About the RoleThe Events team owns Klaviyo’s real-time event ingestion and processing platform, one of the highest-scale systems in the company. As a Software Engineer II on the Events team, you’ll help build and operate distributed systems that ingest, validate, transform, and persist billions of events reliably and efficiently.
This role is ideal for engineers who enjoy working on high-throughput, latency-sensitive systems, care deeply about production quality, and want to grow their skills operating large-scale platforms.
How You’ll Make an Impact- Build and operate real-time event ingestion pipelines used by nearly every Klaviyo feature
- Improve system reliability, performance, and observability in a high-scale environment
- Work on systems that directly power customer-facing automation, analytics, and personalization
- Gain hands-on experience debugging and operating distributed systems in production
- Collaborate closely with engineers across Core Data and product teams
- Design, implement, and maintain event ingestion and processing systems
- Deliver well-scoped projects end-to-end with guidance from senior engineers
- Write high-quality, maintainable, and well-tested production code
- Participate in code reviews and technical design discussions
- Help monitor and improve system performance, reliability, and cost efficiency
- Participate in on-call rotations and incident response with mentorship and support
- Work cross-functionally to ensure event data is reliable and usable by downstream systems
- 3–5 years of professional software engineering experience
- Experience building and maintaining production systems and working with databases
- Proficiency in at least one programming language (Python preferred)
- Understanding of distributed systems fundamentals (e.g. concurrency, failure modes)
- Strong debugging and problem-solving skills
- Ability to deliver well-scoped work independently while collaborating effectively with a team
- Experience with data pipelines, databases, streaming systems, or real-time processing
- Experience operating systems in a cloud environment (AWS preferred)
- Familiarity with monitoring, alerting, and incident response
- Exposure to high-throughput or low-latency systems
- Work on some of the highest-scale systems at Klaviyo
- Solve challenging real-time data problems with real customer impact
- Learn how large distributed systems behave in production
- Grow alongside experienced platform engineers and mentors
- Build foundational infrastructure used across the entire product
At Klaviyo, we value ownership, curiosity, and continuous improvement. Engineers are encouraged to understand the systems they work on deeply, collaborate openly, and take pride in building software that lasts. You’ll be supported in growing your technical skills while making meaningful contributions from day
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.
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.
Top Skills
Klaviyo Boston, Massachusetts, USA Office
We're in the heart of the Financial district with easy access to public transportation and a short walk from South Station. We also have hubs in Denver, London and Sydney.
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