Performance Engineer
Posted 28 Aug 2026
Advertised as “Performance Engineer ”
BranchFactor Summary
The original posting with the fluff stripped out
- Management level
- Individual contributor
- Employment
- Hybrid
- Contract
- Full-time
No salary listed for this role.
UK | Full-Time
The Mission: Source.dev
Our founders spent over a decade at Google shaping the Android operating systems - building and shipping the software that now runs on billions of devices. They didn't just use Android; they led teams responsible for the Android Virtualization Framework, Security, and the Android Runtime (ART).
Through that journey, they saw a quiet but massive crisis: as device software grew in complexity, the tools used to build it remained stuck in the past. Today, a standard Android checkout exceeds 200GB of code, and builds can take hours. This "wait time" is the single biggest tax on innovation.
Source.dev was founded to reimagine software development workflows for device makers. We’re building a new generation of software tools that make building complex device software feel as simple as building a webpage - starting with SourceFS.
The Core Product: SourceFS
SourceFS is a high-performance virtual filesystem designed to turn multi-hour workflows into minutes.
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10x Faster Builds: Intelligent caching and virtualization that only materializes files when they are actually needed.
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10x Lower Costs: Enabling a standard 16-vCPU machine to outperform even a 128-vCPU machine.
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True Engineering Productivity: Replaying hundreds of thousands of build steps instantly when inputs match.
The Cultural Anchor: Own It
We operate with a high degree of trust and a shared value of End-to-End Ownership:
"We own our work end-to-end, from spark to finish. It’s about more than just tasks; it’s the dedication to see things through, staying curious to solve problems, thinking from first principles and ensuring we fix our customer’s problems in the best possible way.”
The Role: Pushing the Speed Limits of Rust, Linux & I/O
We are looking for a Performance / Systems Engineer to join us at Source.dev. In this role, your primary metric of success is speed. You will dissect execution paths, eliminate kernel-space context-switching costs, optimize memory layouts, and ensure SourceFS runs as close to the hardware limits as physically possible.