Senior Software Engineer; Developer Infrastructure

Requirements

• Experienced Engineer:
  You have 5+ years of software engineering experience with strong computer science fundamentals and a focus on clean, maintainable, well-architected code
• Analytical Problem Solver:
  You don't just fix symptoms — you hunt down root causes, implement systemic fixes, and build in safeguards to prevent recurrence
• Platform-Minded:
  You are comfortable reasoning about distributed systems, dependency graphs, and the downstream impact of platform-level decisions across many teams
• Technical Generalist:
  You can move across the stack when needed — whether debugging a Python integration, optimizing a Go service, or wiring up infrastructure automation
• AI Enthusiast:
  You 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
• Extreme Ownership:
  You take pride in the end-to-end health of the platform and proactively advocate for engineering excellence

• 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
• 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 velocity. Relentlessly reduce toil and increase engineering efficiency across the organization
• Set Engineering Standards:
  Contribute to the standards for code quality, dependency hygiene, and platform reliability that all teams follow
• AI-Driven Strategy:
  Spearhead efforts to leverage AI within the platform lifecycle and use AI tooling to accelerate your own development work
• Cross-Functional Collaboration:
  
  Partner with engineers, security teams, and stakeholders to gather requirements, resolve conflicts, and roll out platform changes that teams can adopt with confidence
• Operational Excellence:
  Proactively monitor the health and reliability of the platform, diagnosing and resolving complex issues before they become critical incidents
• High-Leverage Work:
  You are not just building features; you are building the systems that determine how fast every engineer at Klaviyo can ship
• Real Architectural Impact:
  You will influence the structure of a large, complex backend codebase and make decisions that scale with the company
• Innovation at the Edge:
  You will have the autonomy to experiment with AI and emerging tooling to solve hard problems in dependency management, build performance, and developer experience
• Technologies we use (not exhaustive):
• Backend:
  Python, Django, FastAPI, Go
• Frontend:
  React, Type Script
• Infrastructure and CI: AWS, Kubernetes, Terraform, Helm, Buildkite, Pants
• Data:
  MySQL, Postgre
  
  SQL, Redis, Kafka
• AI Tools:
  Claude, Cursor, Copilot, or internal AI enablement frameworks