🚀 Senior Web Security Engineer | Browser Internals/ Web Security | £95,000 base 10% bonus & shares | remote UK
We're looking for an experienced Senior Web Security Engineer to join our team and help secure high-performance web applications operating in some of the world's most demanding environments.
This is a hands-on, technically challenging role at the intersection of browser security, JavaScript, WebAssembly, anti-reverse engineering and application hardening. You'll be tackling sophisticated client-side threats while building secure, highly optimised solutions that perform across modern browsers and devices.
What you'll be doing:
• Design and develop secure JavaScript and WebAssembly components for production applications
• Build anti-tamper, integrity verification and runtime protection mechanisms
• Develop high-performance WebAssembly modules using C++, Rust or AssemblyScript
• Research and mitigate emerging client-side attack techniques
• Analyse browser behaviour, JavaScript engines and WebAssembly runtimes
• Investigate vulnerabilities and lead root-cause analysis and remediation
• Work closely with engineering, product and red teams to embed security throughout the SDLC
• Help shape technical architecture and mentor other engineers
What we're looking for:
• 5+ years' software engineering experience
• Expert-level JavaScript/TypeScript and strong production WebAssembly experience
• Experience with Rust, C++ or another systems language used to produce WASM
• Deep understanding of browser internals and modern web APIs
• Experience defending applications against reverse engineering, runtime modification, instrumentation and code injection
• Knowledge of areas such as WASM binary analysis, obfuscation/de-obfuscation, anti-debugging, anti-tamper and runtime integrity
• Strong testing, debugging, profiling and CI/CD experience
• Excellent communication skills and the ability to explain complex technical concepts clearly
If you are keen to find out more please apply for a detailed discussion.