Paradigm Tech
Senior Web Security Engineer
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🚀 Senior Web Security Engineer | Browser & WebAssembly Security | £80,000 base 10% bonus & shares | London twice a month
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
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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
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