Senior Software Engineer - Developer Infrastructure

Klaviyo • Boston, MA

21h

About The Position

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.

Requirements

• 5+ years of software engineering experience with strong computer science fundamentals and a focus on clean, maintainable, well-architected code.
• Comfortable reasoning about distributed systems, dependency graphs, and the downstream impact of platform-level decisions across many teams.
• Can move across the stack when needed — whether debugging a Python integration, optimizing a Go service, or wiring up infrastructure automation.
• Have already experimented with AI in your work or personal projects and are eager to find ways to use it to make your work smarter and more efficient.
• Take pride in the end-to-end health of the platform and proactively advocate for engineering excellence.

Nice To Haves

• 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.
• Lead the planning and execution of major software releases and updates — from design through production rollout — including hands-on individual contribution throughout.
• 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.
• Contribute to the standards for code quality, dependency hygiene, and platform reliability that all teams follow.
• Spearhead efforts to leverage AI within the platform lifecycle and use AI tooling to accelerate your own development work.
• Partner with engineers, security teams, and stakeholders to gather requirements, resolve conflicts, and roll out platform changes that teams can adopt with confidence.
• Proactively monitor the health and reliability of the platform, diagnosing and resolving complex issues before they become critical incidents.

Responsibilities

• 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.
• Lead the planning and execution of major software releases and updates — from design through production rollout — including hands-on individual contribution throughout.
• 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.
• Contribute to the standards for code quality, dependency hygiene, and platform reliability that all teams follow.
• Spearhead efforts to leverage AI within the platform lifecycle and use AI tooling to accelerate your own development work.
• Partner with engineers, security teams, and stakeholders to gather requirements, resolve conflicts, and roll out platform changes that teams can adopt with confidence.
• Proactively monitor the health and reliability of the platform, diagnosing and resolving complex issues before they become critical incidents.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed
• Number of Employees: 501-1,000 employees