Senior Software Engineer - Developer Infrastructure

Our core focus is empowering engineers to ship code efficiently and safely. We own the build systems, dependency lifecycle, and platform infrastructure that underpin every engineer's daily workflow. As a Senior Software Engineer on this team, you will help define and execute the technical roadmap for Klaviyo's backend platform — from dependency management and major framework upgrades to developer productivity tools that reduce toil and accelerate velocity. By building and maintaining the systems

You have 5+ years of software engineering experience with strong computer science fundamentals and a focus on clean, maintainable, well-architected code. You don't just fix symptoms — you hunt down root causes, implement systemic fixes, and build in safeguards to prevent recurrence. You are comfortable reasoning about distributed systems, dependency graphs, and the downstream impact of platform-level decisions across many teams. You can move across the stack when needed — whether debugging a Pyt