About this role
Salary: £33,000 - 73,000 per year
Requirements: 5+ years of professional web development experience.JavaScript, TypeScript, C++, or Rust experience.Experience with app security, cryptography, secure communications, and authentication.Nice to have: JavaScript obfuscation and de-obfuscation.Nice to have: WebAssembly (WASM) binary analysis.Nice to have: static and dynamic code analysis.Nice to have: anti-debugging, anti-tamper, and software protection techniques.Nice to have: runtime integrity verification and secure code signing.Nice to have: secure SDLC practices.Nice to have: browser engine internals, including V8, SpiderMonkey, JavaScriptCore, or Chromium.Nice to have: WebGPU, WebRTC, or WebCodecs.Nice to have: binary instrumentation and compiler toolchains.Nice to have: SDK and developer platform development.Nice to have: mobile browser security.Nice to have: biometrics, identity verification, or fraud prevention technologies.Nice to have: open-source security contributions or published security research. Responsibilities: Build and evolve security-focused technologies that strengthen the resilience of browser-based products and applications.Engineer defensive controls designed to safeguard software executing in untrusted client environments.Develop mechanisms that detect and respond to unauthorised modification, inspection, manipulation, and automated interaction.Create performance-critical browser components using native and compiled-to-web technologies, including Rust, C++, AssemblyScript, and WebAssembly.Explore the internals of modern browsers and execution environments to understand how applications behave under both legitimate and adversarial conditions.Identify weaknesses across client-side application architectures and turn security research into deployable engineering solutions.Investigate new approaches used to analyse, manipulate, instrument, or circumvent browser-delivered software, and develop appropriate countermeasures.Work alongside software engineers, security specialists, offensive security teams, and product stakeholders to ensure defensive requirements are incorporated from initial design through production.Lead technical investigations into complex security issues, establishing underlying causes and engineering preventative solutions rather than short-term fixes.Influence architectural decisions around application security, resilience, performance, and client-side trust boundaries.Share specialist knowledge across the engineering organisation, helping teams adopt stronger approaches to secure software design and implementation. Technologies: CryptographyJavaScriptMobileRustSecurityTypeScriptWebAssemblyWeb More:
We are a high-growth technology business hiring a Senior Web Engineer for a highly technical role combining web engineering and security. This is a remote position with 1-2 visits per month to London. We offer up to £95,000, equity or share options, up to a 10% bonus, private healthcare and wellbeing benefits, pension and life assurance, professional development and training, and enhanced annual leave with flexible benefits.
last updated 38 week of 2026