Software Engineer, Build Systems / CI

About this role

Join OpenAI's Engineering Acceleration team to design and maintain build systems and CI infrastructure that power the organization's engineering velocity. You'll own Bazel-based builds, Buildkite pipelines, remote caching, and developer tooling across a large monorepo while partnering with product and infrastructure teams to eliminate bottlenecks.

What you'll do

• Own and evolve Bazel build workflows, Starlark rules, and toolchains for a polyglot monorepo
• Optimize CI performance including build time, queue time, cache hit rates, and test flakiness
• Build systems for test selection, dependency analysis, and intelligent scheduling to reduce unnecessary CI work
• Improve local development workflows so engineers can reproduce and debug CI behavior quickly
• Operate and optimize build infrastructure including Docker, Kubernetes runners, and remote execution systems
• Instrument systems with metrics, dashboards, and analytics to measure speed, reliability, and developer impact

What they're looking for

• 5+ years software engineering experience with infrastructure/tooling focus
• Hands-on experience with Bazel, Buck, Pants, or similar build systems
• CI/CD systems design and operation at scale
• Distributed systems debugging across containers, runners, and remote caching
• Python, Go, TypeScript, Rust, or C++
• Kubernetes and containerization (Docker/OCI)
• Infrastructure as code (Terraform)
• Strong communication and cross-team collaboration