Software Engineer II - Events

Klaviyo•Boston, MA

18d•Hybrid

About The Position

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.

Requirements

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 Haves

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

Responsibilities

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