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DevOps Engineer (Junior/Mid-Level) - Bazel Monorepo

Fractile
London

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Job details

Full-time

Qualifications

Rust (programming language)
C++
Continuous integration
Scripting
GitHub
SystemVerilog
Python

Full job description

DevOps Engineer (Junior/Mid-Level) - Bazel Monorepo

Fractile · London or Bristol · Full-time

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 100+ person team spans hardware and software, and we're growing fast to deliver our product at scale.

We're an exceptional team working on an exceptional problem. If you want to build infrastructure that powers the future of AI computing, you'll fit right in.

The Role

We're looking for a Build Systems Engineer to own Bazel at Fractile and build the tooling that underpins every part of what we do — from ML models and kernel drivers to hardware simulation and compilers. This is a greenfield role: no legacy systems, no inherited constraints. You'll be designing the Bazel ecosystem from scratch in a fast-growing deep-tech company.

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 stack
Scale our monorepo as we grow across Python, C++, Rust, SystemVerilog, and ML workloads
Create reproducible, multi-language build pipelines
Optimise CI performance across large compute clusters
Define the developer experience for every engineer at Fractile
Contribute upstream to Bazel rules we depend on

Why This Role Stands Out

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

You'll be a strong fit if you have:

5+ years in software or infrastructure engineering
3+ years working with build systems
Strong hands-on experience with Bazel
Python scripting and automation skills
Experience with CI/CD for large-scale products

Bonus Points

These aren't requirements, but they'd make you stand out:

Experience with ML pipelines
GitHub Actions or similar CI tooling
Multi-language build systems
Container-based build environments

Why Fractile

Work on genuinely novel problems at the frontier of AI hardware
A collaborative culture built on curiosity, initiative, and technical depth
Hybrid working: 3 days onsite (London or Bristol), 2 days remote
Modern offices in London and Bristol — choose your base
Competitive salary and equity in a fast-growing company

Export Control & 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.

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.

Apply Now

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