Platform Engineer - Build & CI

Here at Humanoid, we believe in a future where robots amplify human potential. That’s why we’ve set out on a mission to build the world’s most capable, commercially-scalable, and safe humanoid robots. We’re bringing that mission to life with HMND‑01 Alpha - our rapidly developed humanoid platform now running in real industrial pilots - and we’re growing the team to take it even further. ABOUT THE ROLE We are looking for a Software Engineer to own the build system and CI infrastructure that every engineer at Humanoid depends on every day. This is foundational work: a slow, unreliable, or opaque build pipeline is a tax on the entire engineering organisation, and getting it right directly determines how fast we can ship robots. We are investing heavily in build infrastructure - hermetic, incremental, fully cached builds across a complex multi-target monorepo spanning firmware, robot software, simulation, and cloud - and we need someone to drive that work and own the system it produces. This is a deeply technical infrastructure role. You will work closely with every engineering team in the organisation, and the quality of your work will be felt by every person who opens a PR. WHAT YOU’LL DO - Build and maintain CI pipelines in GitHub Actions: incremental test selection based on affected targets, nightly full builds, and clear triage tooling when main goes red - Instrument the build: CI telemetry, dashboards showing build and test times broken down by job type, branch, and author — so we stop flying blind on build health - Define and enforce the policies that keep main green: merge queue configuration, PR gating, and the on-call process when broken builds block other engineers - Own and maintain the remote build cache infrastructure, ensuring cache correctness, invalidation on environment changes, and read-only promotion from main only - Own the developer environment story — local builds, dependency management, and the tooling that lets engineers iterate quickly without fighting their environment - Maintain and evolve the dependency mirroring infrastructure (apt, PyPI, and other upstream registries) so that external package availability never blocks a build WHAT WE’RE LOOKING FOR - Solid experience with build systems - ideally Bazel, but deep knowledge of CMake or similar is fine; the instincts matter more than the specific tool - Experience designing and operating CI pipelines at scale: incremental testing, artifact caching, runner management, and keeping feedback loops short - Strong understanding of hermetic build environments - Comfort debugging complex build failures across multiple languages and toolchains - Experience with dependency management and the tradeoffs between reproducibility, speed, and upstream risk - Good instincts for developer experience NICE TO HAVE - Familiarity with ROS/ROS2 build tooling (colcon, ament, CMake) - Familiarity with Kubernetes: self-hosted runners, ARC - Experience with GitHub Actions at scale - Background in robotics or embedded systems where build artifacts span multiple target architectures and deployment environments WHAT WE OFFER - Competitive equity: stock options with meaningful upside as we scale. - 30+ paid days off, including 23 days of annual leave, all UK bank holidays, and additional company closure days (including Christmas–New Year shutdown). - Private healthcare, including virtual and in-person care. - Pension scheme with 8% total contribution (5% employee, 3% employer) on full earnings. - Free daily breakfast, catered lunch, and snacks in-office. - Work at the frontier - collaborate daily with world-class engineers, researchers, and product experts building the next generation of AI and humanoid robotics. - Real ownership - direct access to founding leadership, meaningful input on product direction, and the ability to drive key initiatives from day one.