Software Engineer

Build Engineer | Bazel

📍 London

🏠 Hybrid - 2 days in the office, 3 days wfh

💶 Up to £750/day - Outside IR35

📄 12 months contract, possible extensions

5V Tech are working with a fast-growing deep tech company building a completely new class of AI accelerator hardware and software from first principles.

They’re now looking for an engineer to take ownership of Bazel at scale and build the tooling infrastructure that powers the entire engineering organisation.

This is a genuinely high-impact role in a greenfield environment, where you’ll help shape the build systems, developer workflows, and CI infrastructure from the ground up.

What you’ll be working on:

• Designing and owning Bazel rules and extensions

• Scaling a large monorepo across Python , C++ , Rust , SystemVerilog, and ML workloads

• Building reproducible, multi-language build pipelines

• Optimising CI performance across large compute clusters

• Improving the developer experience across engineering teams

• Contributing upstream to Bazel rules and tooling

• Working closely with teams across AI/ML, Runtime, Simulation, Compilers, and Hardware

Why this role stands out:

• Greenfield environment with no legacy systems

• Huge technical variety across software, ML, infrastructure, and hardware

• High ownership and visibility across the business

• Opportunity to define how engineering operates as the company scales

• Cutting-edge AI and accelerator technology

What they’re looking for:

• Extensive experience in Software Engineering or Infrastructure Engineering

• Proficient in working with build systems

• Strong Bazel experience

• Python scripting and automation skills

• Experience building and maintaining CI/CD pipelines at scale

Nice to have:

• ML pipeline experience

• GitHub Actions

• Multi-language build environments

• Docker / Kubernetes / containerisation experience

5V Tech are acting as an Employment Agency for the purposes of this temporary vacancy. We offer a reward scheme if you can recommend someone for this contract, up to €£250 for you and an additional £250 to a charity of your choice, 5V Tech are recognised talent solutions experts within IoT and Deep Tech working across Europe, the UK and North America.