Summary
✨ AI‑Generated
Be a key builder of the core infrastructure that powers our cutting‑edge AI hardware and software. You will craft the Bazel build system, creating reusable rules and extensions that span machine learning models, kernel drivers, and hardware simulation. Your work will become the foundation for every engineer in the company, enabling rapid, high‑performance development in a greenfield environment. Enjoy a hybrid work arrangement and contribute to a pioneering team redefining AI capabilities.
Highlights
Designs and owns Bazel build system for an AI hardware and software platform, creating foundational tooling that supports ML models, kernel drivers, and hardware simulation. Works in a fast‑growing, cross‑disciplinary team to deliver high‑performance AI infrastructure, with a flexible hybrid work model.
Description
Build Systems Engineer (Bazel)
Fractile
London or Bristol Full-time Hybrid (3 days onsite)
About Fractile
Fractile is building silicon, systems, and software that will redefine the frontier of AI — running the world's most advanced models at radically higher speed and lower cost.
Founded in 2022, our fast-growing team spans hardware and software, working hand in hand to deliver a new class of ML hardware from first principles.
If you want to build infrastructure that every engineer in the company depends on, this is the role.
The Role
We're looking for a Build Systems Engineer to own Bazel at Fractile — designing the tooling that powers every part of what we build, from ML models and kernel drivers to hardware simulation.
This is a greenfield role: no legacy, no inherited constraints.
Your work will become the foundation every engineer at Fractile builds on.
That's the scope, and that's the opportunity.
What You'll Work On
Design and own Bazel rules and extensions across the stackScale our monorepo as we grow across Python, C++, Rust, SystemVerilog, and ML workloadsCreate reproducible, multi-language build pipelinesOptimise CI performance across large compute clustersDefine the developer experience for every engineer at FractileContribute upstream to Bazel rules we depend on
Why This Role Stands Out
No legacy — you're building the Bazel ecosystem from scratchExtreme variety — ML, compilers, kernel drivers, simulators, hardware verificationHigh impact — your work becomes the backbone of the entire engineering organisationDeep collaboration with Simulation, Runtime, and Hardware teamsReal ownership — you shape how Fractile builds software
What We're Looking For
You'll Be a Strong Fit If You Have
5+ years in software or infrastructure engineering3+ years working with build systemsStrong hands-on experience with BazelPython scripting and automation skillsExperience with CI/CD for large-scale products
Bonus Points
These Aren't Requirements, But They'd Make You Stand Out
Experience with ML pipelinesGitHub Actions or similar CI toolingMulti-language build systemsContainer-based build environments
Why Fractile
Work at the frontier of AI hardware on genuinely novel engineering problemsA collaborative culture built on curiosity, initiative, and technical depthHybrid working: 3 days onsite (London or Bristol), 2 days remoteModern offices in London and Bristol — choose your baseCompetitive salary and equity in a fast-growing company
Fractile is committed to building a diverse and inclusive team.
We welcome applications from people of all backgrounds and actively encourage candidates from underrepresented groups to apply.
Ready to apply? Send us your CV and a brief note on what excites you about this role.
