--- title: "Performance Engineer" company: "source.dev" company_url: "https://www.remjobs.works/companies/source-dev" url: "https://www.remjobs.works/job/source-dev-performance-engineer-7e15fb4c-4f9e-405b-aefc-5958a10c3077" apply_url: "https://jobs.ashbyhq.com/sourcedev/3365f30d-5b3e-4c47-8901-34480d3e1bd0" workplace: hybrid location: "London " employment_type: full-time seniority: mid role: software-engineering region: united-kingdom skills: ["cpp", "linux", "rust"] date_posted: 2026-08-28T12:29:37.706Z first_seen_by_remjobs: 2026-09-19T22:14:59.999Z --- # Performance Engineer **source.dev** · London Apply: https://jobs.ashbyhq.com/sourcedev/3365f30d-5b3e-4c47-8901-34480d3e1bd0 ## About the role **UK | Full-Time** #### The Mission: [Source.dev](http://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](http://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. - 10x Faster Builds: Intelligent caching and virtualization that only materializes files when they are actually needed. - 10x Lower Costs: Enabling a standard 16-vCPU machine to outperform even a 128-vCPU machine. - 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](http://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. ##### What You’ll Work On - System Bottleneck Hunting: Profile, trace, and eliminate latency across CPU, memory, and disk I/O bottlenecks in Rust systems code using tools like perf, eBPF, valgrind, and custom microbenchmarks. - Kernel & File System Tuning: Deep dive into Linux kernel interactions, optimizing FUSE drivers, VFS caches, asynchronous I/O (io_uring), memory-mapped execution, and thread scheduling. - Memory & Cache Efficiency: Optimize data structures for cache locality, minimize allocation overhead, and eliminate unnecessary memory copies across boundary transitions. - Benchmarking Infrastructure: Design robust, reproducible benchmarking suites to measure micro- and macro-performance regression in high-concurrency environments. - Scaling Build Primitives: Squeeze peak performance out of massive build graphs (Android, Yocto, and more) running on high-core hardware configurations. ##### Ideal Candidate Profile: - The Performance Systems Mindset: You have a deep understanding of computer architecture (CPU caches, memory barriers, SIMD, system calls) and proven experience writing hyper-optimized code in Rust or C/C++.(or other). No prior experience with Rust required, just a willingness to learn is all we are looking for. - Scale-Obsessed: You have experience with (or a burning desire to fix) large-scale build systems and developer tooling. - Impact-Driven: You embody the "Own It" mentality - you see a friction point in the developer journey and you don’t stop until it’s gone. - Curious & Collaborative: You enjoy translating real-world customer problems into robust, production-grade solutions. - Low Ego, High Impact: Beyond being a brilliant coder, you are a thoughtful and empathetic teammate - someone who leads with kindness - Feedback Culture Champion: You embrace feedback and provide it thoughtfully; you see open, honest communication as the foundation of great teamwork. #### A Note on Our Search We are looking for the best talent, wherever it may be. If you’re on the fence about whether you’re a perfect fit, please do apply - we value diverse backgrounds and unique problem-solving approaches. #### Why Join [Source.dev](http://Source.dev)? - AI-Native Infrastructure: We merge deep systems expertise with AI to solve the "impossible" - using AI to automate complex merges and conflict resolution for the next generation of devices. - Architect the Future: Have a direct, visible impact on the infrastructure used to build the world’s most advanced hardware. - Early-Stage Ownership: You’ll have a seat at the table to shape our technical roadmap, product direction, and culture from day one. - Tier-One Partnerships: Work side-by-side with world-class customers, from global automotive giants to leading cloud providers. - Elite Engineering Culture: Join a high-trust & passionate team of engineers --- Source: source.dev's own career page, read by RemJobs. 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