Software Engineer - Developer Experience

We’re looking for an engineer who wants to own Bazel at scale and build the tooling that powers every part of Fractile, from ML models to kernel drivers to hardware simulation.This is a greenfield Bazel role in a fast-growing deep-tech company building a new class of ML hardware and software from first principles.

What You’ll Work On

Designing and owning Bazel rules and extensions

Scaling our monorepo as we grow across Python, C++, Rust, SystemVerilog and ML workloads

Creating reproducible, multi-language build pipelines

Optimising CI performance across large compute clusters

Defining the developer experience for every engineer at Fractile

Contributing upstream to Bazel rules we depend on

Why this role is unique?

No legacy — you’re building the Bazel ecosystem from scratch

Extreme variety — ML, compilers, kernel drivers, simulators, hardware verification

High impact — your work becomes the backbone of the entire engineering organisation

Deep collaboration with Simulation, Runtime, and Hardware teams

Real ownership — you shape how Fractile builds software

What We’re Looking For

5+ years in software or infrastructure engineering

3+ years with build systems

Strong experience with Bazel

Python scripting and automation

Experience with CI/CD for large-scale products

Bonus: ML pipelines, GitHub Actions, multi-language build systems, containers