Software Engineer II - Events

Location: Boston

This job is with Klaviyo, an inclusive employer and a member of my Gwork – the largest global platform for the LGBTQ+ business community. Please do not contact the recruiter directly.

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  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 — Events
Boston, 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 Role
The  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

What You’ll Do

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

What We’re Looking For
Required

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

Nice to Have

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

Why Join the Events Team?

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…