Platform Engineer - Build and CI in London

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

• Meaningful time off to rest and recharge: 23 days of annual leave (accrued), 15 days of paid sick leave, and paid company holidays.
• Fully funded private healthcare for UK employees, with broad provider access, virtual and in‑person care, and strong mental health and serious illness support.
• Equity included–we believe builders should share in what they build.
• Pension scheme with a total 8% contribution (5% employee, 3% employer) on full earnings.
• Free daily breakfast, catered lunch, and snacks in‑office.
• Collaboration with top‑tier engineers, researchers, and product experts in AI and robotics.
• Freedom to influence the product and own key initiatives.