Senior Software Engineer - Developer Infrastructure

About this role

*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 klaviyo.com/careers to see how we empower creators to own their own destiny.*

Why You Should Join the Developer Infrastructure Team

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 foundational systems that keep our codebase healthy and scalable, you will play a pivotal role in ensuring every engineer at Klaviyo can move fast with confidence.

What You'll Achieve: Key Responsibilities

As a Senior Software Engineer for this team, you will drive the evolution of our developer platform across the organization:

• **Dependency Management:** Analyze, optimize, and secure backend and third-party dependencies across the codebase. Build frameworks for evaluating risk and ensuring our dependency graph stays healthy, performant, and maintainable.
• **Platform Upgrades and Rollouts:** Lead the planning and execution of major software releases and updates — from design through production rollout — including hands-on individual contribution throughout.
• **Developer Productivity:** Drive improvements across key cycle time metrics including PR CI speed, code review turnaround, and commit...