DevOps Engineer; Senior - Bazel Monorepo

Bristol or London

Hybrid:
Three days on-site

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.

• Designing and owning Bazel rules and extensions
• Scaling our monorepo as we grow across Python, C++, Rust, System Verilog 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

• 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

• 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

• ML pipelines
• Git Hub Actions
• Multi-language build systems
• Containers