> Markdown version of [/jobs/ext/2452579-performance-engineer](https://www.wearedevelopers.com/jobs/ext/2452579-performance-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Performance Engineer - **Company:** source - **Location:** London, UK - **Contract:** Permanent contract - **Skills:** Artificial Intelligence, C++ (Programming Language), Data Structures, File Systems, Linux Kernel, Performance Tuning, Software Systems, System Programming, Caching, Yocto, Build Tools, Hardware Infrastructure - **Published:** August 28, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=03ecb89d87b0a1e6 ## About the Role * 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. ## Description 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., * 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., * 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 ## Related Videos - [But, you're not Facebook](https://www.wearedevelopers.com/videos/378-but-you-re-not-facebook) - [Modern Data Architectures need Software Engineering](https://www.wearedevelopers.com/videos/1030-modern-data-architectures-need-software-engineering) - [HTTP headers that make your website go faster](https://www.wearedevelopers.com/videos/1676-http-headers-that-make-your-website-go-faster) - [Shipping Faster with Less: Render on Cloud Hosting, AI Workloads, and the Future of DevOps](https://www.wearedevelopers.com/videos/1894-shipping-faster-with-less-render-on-cloud-hosting-ai-workloads-and-the-future-of-devops) - [Building a framework-independent component library](https://www.wearedevelopers.com/videos/1679-building-a-framework-independent-component-library) - [Event based cache invalidation in GraphQL](https://www.wearedevelopers.com/videos/433-event-based-cache-invalidation-in-graphql) ## Related Articles - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Top Characteristics of a Software Engineer](https://www.wearedevelopers.com/magazine/166-top-characteristics-of-a-software-engineer) - [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again) - [Dev Digest 131 - AI'm not sure about OSS](https://www.wearedevelopers.com/magazine/472-dev-digest-131-ai-m-not-sure-about-oss) - [Dev Digest 102 - Race conditions](https://www.wearedevelopers.com/magazine/386-dev-digest-102-race-conditions)