Senior Platform Engineer

Responsibilities

• Lead migration from Node Bazel rules to a maintained successor and complete the JavaScript toolchain migration to Bazel modules.
• Replace image and packaging workarounds with proper module linking and incremental compilation.
• Establish and improve p50 and p95 pull-request build and test-time metrics through caching, incremental builds, and test parallelism.
• Own remote cache fleet sizing, eviction behavior, and cost.
• Build telemetry for per-target timing, cache hit rate, flake rate, and cost.
• Own developer test workflows across unit, integration, browser end-to-end, and visual testing.
• Make local and CI commands consistent, support single-file and affected-graph execution, and detect and quarantine flaky tests.
• Improve lint, static analysis, and coverage as reliable quality gates.
• Replace shared environments with short-lived, isolated environments created per branch or task.
• Deliver hermetic, sandboxed, reproducible build and test environments that support safe parallel agent execution and automated review and presubmit signals.

Requirements

• 6+ years owning a monorepo build system at scale.
• Deep knowledge of hermeticity, sandboxing, action graphs, and cache invalidation.
• Experience owning incremental builds, test sharding, self-hosted runner fleets, presubmit/postsubmit design, and merge queues.
• Deep experience with production frontend bundler pipelines and shared UI packages.
• Strong Node.js and TypeScript expertise, including CJS/ESM module resolution and packaging, with comfort working alongside Go.
• Experience eliminating hidden network calls, machine-dependent toolchains, and undeclared inputs to ensure reproducible builds and prevent cache or sandbox poisoning.
• Proven ownership of flake detection and quarantine, balanced sharding, merge signals, and measurable improvements in build times, CI spend, or artifact and bundle sizes.

Preferred Qualifications

• Strong Bazel experience preferred; Buck2, Pants, Nx, or Turborepo also considered.
• Experience with webpack, Vite, esbuild, or Turbopack.
• Experience with Jest, Playwright, and Cypress.

Compensation & Benefits

• Base salary: $180,000–$260,000 annually.
• Competitive employee equity.
• 401(k) program.
• Medical, dental, and vision benefits.
• FSA/HSA benefits.
• $175/month commuter benefit.
• Additional wellbeing benefits.
• Flexible paid time off.
• Paid parental leave.
• Professional development stipend.
• Hybrid office policy.
• Lunch and dinner provided daily.
• Company-sponsored social events.