At a Glance
- Tasks: Design and own Bazel rules, optimise CI performance, and create multi-language build pipelines.
- Company: Fractile, a fast-growing deep-tech company redefining AI with innovative hardware and software.
- Benefits: Hybrid work model, collaborative culture, and opportunities for professional growth.
- Other info: Dynamic team environment with a focus on curiosity and entrepreneurial initiative.
- Why this job: Join a greenfield project with real ownership and high impact on cutting-edge technology.
- Qualifications: 5+ years in software engineering, 3+ years with build systems, strong Bazel experience.
The predicted salary is between 50000 - 60000 £ per year.
Bristol or London Hybrid: Three days on-site Fractile is building silicon, systems and software which will redefine the frontier of AI: running the world’s most advanced models at radically higher speed and lower cost. We have an exceptional team across hardware and software capable of bringing about this change, and we are growing fast to meet demand and deliver our product at scale.
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 Will 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 Are 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 Skills
- ML pipelines, GitHub Actions, multi-language build systems, containers
About Us
- Founded in 2022, team of 100+ which is expanding rapidly
- Modern, open offices in London and Bristol
- Collaborative, problem‑solving culture built on deep curiosity, entrepreneurial initiative and technical fluency
Export control and security clearance Certain roles may involve working on technologies subject to export restrictions. Applicants may be required to undergo additional eligibility checks to ensure compliance with applicable law.
DevOps Engineer (Junior/Mid-Level) - Bazel Monorepo employer: Fractile
Fractile is an exceptional employer that fosters a collaborative and innovative work culture, where engineers can take ownership of cutting-edge projects in AI and ML hardware and software. With modern offices in Bristol and London, employees benefit from a hybrid work model, ample opportunities for professional growth, and the chance to contribute to groundbreaking technology without the constraints of legacy systems. Join us to be part of a fast-growing team that values curiosity, initiative, and technical excellence.
