# Software Engineer (Developer Infrastructure)

**Company:** [World Labs](https://hotfix.jobs/companies/world-labs)
**Location:** San Francisco, CA
**Role:** DevOps / SRE
**Experience:** 5+ years
**Skills:** Bazel, Python, Go, Rust, Buck, Pants, Remote Caching, Remote Execution, Canarying, Rollback
**Posted:** 2026-05-08

> Owns developer infrastructure including Bazel-based monorepo build systems, test infrastructure, and release pipelines to enhance engineering velocity and reliability. Requires 5-10 years experience with build tools like Bazel and languages like Python, Go, or Rust.

## Job Description

## What You Will Do

- Own the design and evolution of the build, test, and release systems that power the platform.
- Define architecture for a **Bazel** based monorepo, including performance, caching, and dependency graph scalability.
- Improve build performance and correctness, including incremental builds, caching strategies, and graph optimization.
- Design and operate test infrastructure, focusing on reliability, isolation, and signal quality.
- Build and improve release and rollout systems, including deployment pipelines, canarying, and rollback.
- Improve end to end developer velocity, from local iteration to production deployment.
- Debug and resolve complex issues across the pipeline, including build failures, dependency issues, test flakiness, and release regressions.
- Establish standards for reproducibility, observability, and operability across build and release systems.
- Identify and eliminate systemic failure modes across the development lifecycle.
- Contribute broadly across infrastructure and reliability work when needed.
- Mentor engineers and raise the bar for system design and technical decision making.

## Key Qualifications

- 5-10 years of experience building and operating production systems at scale, with ownership of critical infrastructure.
- Strong experience with build systems and dependency graphs such as **Bazel**, **Buck**, **Pants**, or similar, or the ability to quickly ramp on **Bazel** in a large monorepo environment.
- Experience designing and improving build, test, and release pipelines, with a focus on performance, correctness, and reproducibility.
- Strong systems understanding of how code moves from source to build to test to production.
- Hands on experience debugging complex system issues, including build failures, dependency issues, test flakiness, and release regressions.
- Experience owning systems with strict reliability and performance requirements.
- Strong proficiency in at least one of **Python**, **Go**, or **Rust**, with a strong preference for **Python**.
- Comfort working across languages in a polyglot codebase.
- Proven ability to define architecture and drive technical decisions end to end.
- Strong judgment in balancing developer velocity, system complexity, and reliability.
- Ability to operate effectively in ambiguous, fast moving environments with high ownership.
- You have worked on systems where build performance, correctness, and reproducibility were first order concerns, not afterthoughts.

## Preferred Qualifications

- Deep experience with **Bazel** at scale, including remote caching, remote execution, and build graph optimization.
- Experience designing hermetic and reproducible build systems.
- Experience improving test infrastructure at scale, including eliminating flakiness and improving signal quality.
- Experience building or operating release and rollout systems, including canarying, staged rollouts, and rollback mechanisms.
- Experience instrumenting systems for observability and debugging of build, test, and release pipelines.
- Experience in early stage or high growth environments.

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**Apply:** https://hotfix.jobs/jobs/48e98fbc-f0bf-406e-b04b-594c8ee283a7
**Canonical:** https://hotfix.jobs/jobs/48e98fbc-f0bf-406e-b04b-594c8ee283a7