Senior Software Engineer - Developer Infrastructure

<div class="content-intro"><p><em>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 <a class="_ymio1r31 _ypr0glyw _zcxs1o36 _mizu194a _1ah3dkaa _ra3xnqa1 _128mdkaa _1cvmnqa1 _4davt94y _4bfu18uv _1hms8stv _ajmmnqa1 _vchhusvi _kqswh2mm _ect4ttxp _syaz13af _1a3b18uv _4fpr8stv _5goinqa1 _f8pj13af _9oik18uv _1bnxglyw _jf4cnqa1 _30l313af _1nrm18uv _c2waglyw _1iohnqa1 _9h8h12zz _10531ra0 _1ien1ra0 _n0fx1ra0 _1vhv17z1" href="http://klaviyo.com/careers" data-renderer-mark="true">klaviyo.com/careers</a> to see how we empower creators to own their own destiny.</em></p></div><p><strong>Why You Should Join the Developer Infrastructure Team </strong></p> <p>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.</p> <p><strong>What You'll Achieve: Key Responsibilities</strong></p> <p>As a Senior Software Engineer for this team, you will drive the evolution of our developer platform across the organization:</p> <ul> <li><strong>Dependency Management:</strong> 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.</li> <li><strong>Platform Upgrades and Rollouts:</strong> Lead the planning and execution of major software releases and updates — from design through production rollout — including hands-on individual contribution throughout.</li> <li><strong>Developer Productivity:</strong> Drive improvements across key cycle time metrics including PR CI speed, code review turnaround, and commit velocity. Relentlessly reduce toil and increase engineering efficiency across the organization.</li> <li><strong>Set Engineering Standards:</strong> Contribute to the standards for code quality, dependency hygiene, and platform reliability that all teams follow.</li> <li><strong>AI-Driven Strategy:</strong> Spearhead efforts to leverage AI within the platform lifecycle and use AI tooling to accelerate your own development work.</li> <li><strong>Cross-Functional Collaboration:</strong> Partner with engineers, security teams, and stakeholders to gather requirements, resolve conflicts, and roll out platform changes that teams can adopt with confidence.</li> <li><strong>Operational Excellence:</strong> Proactively monitor the health and reliability of the platform, diagnosing and resolving complex issues before they become critical incidents.</li> </ul> <p><strong>What Makes This Role Exciting:</strong></p> <ul> <li><strong>High-Leverage Work:</strong> You are not just building features; you are building the systems that determine how fast every engineer at Klaviyo can ship.</l