The Senior Software Engineer on the Code Scalability team at DoorDash will focus on improving build systems and continuous integration for large monorepos. This role involves making software building efficient and predictable while addressing challenges that arise from shared dependencies and multiple teams contributing to a monorepo. The engineer will work with tools like Bazel and Buildkite to enhance build execution, caching, and diagnostics. The impact of this role is significant, as it supports all teams relying on the platform by reducing delays and improving overall development efficiency.

• 5+ years of software engineering experience, particularly in developer infrastructure, build systems, or CI platforms.
• Proficiency in writing maintainable production software in languages such as Go, Java, Kotlin, or Python.
• Experience with build or CI systems at scale, including reasoning about dependencies, incremental builds, caching, and distributed execution.
• Demonstrated ability to lead technical projects across teams and manage practical design tradeoffs.
• A product-oriented mindset, focusing on developer needs and workflow adoption.

• Evolve build and CI workflows for large monorepos to maintain fast feedback and manageable changes.
• Develop Bazel rules, toolchains, and integrations to ensure reproducible builds and ease of adoption.
• Improve Buildkite pipeline throughput and reliability by addressing build bottlenecks and reducing queue times.
• Reduce redundant build work through dependency analysis, incremental builds, caching, and parallel execution.
• Build developer tools that assist in explaining build failures and help engineers reproduce CI behavior locally.
• Rethink build and CI platform capabilities using AI for intelligent diagnosis and automated recovery.
• Instrument and operate build and CI infrastructure, using metrics to track performance and address issues.
• Lead platform improvements from design through rollout and mentor teammates in technical decisions.