Web Developer

Senior Web Engineer | Product Security | Remote, 1-2 times per month in London | Salary up to £95,000

I’m working with a high-growth technology business looking for a Senior Web Engineer to join the team. This is a highly technical role combining both Web Engineering and Security, for this role they are comfortable within finding a really strong Mobile Engineer who has some exposure to security, application protection, authentication, biometrics etc.

What you'll be doing:

• 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.

What they're looking for:

• 5+ years of professional web development experience.
• JavaScript/Typescript or C++ Or Rust
• Some Experience with App Security, cryptography, secure communications and authentication.

Nice to have:

• JavaScript obfuscation and de-obfuscation
• WebAssembly (WASM) binary analysis
• Static and dynamic code analysis
• Anti-debugging, anti-tamper, and software protection techniques
• Runtime integrity verification and secure code signing
• Secure SDLC practices
• Browser engine internals, including V8, SpiderMonkey, JavaScriptCore, or Chromium
• WebGPU, WebRTC, or WebCodecs
• Binary instrumentation and compiler toolchains
• SDK and developer platform development
• Mobile browser security
• Biometrics, identity verification, or fraud prevention technologies
• Open-source security contributions or published security research

What's on offer:

• Up to £95,000
• Equity/share options
• Up to 10% bonus
• Remote Working- 1-2 a month in London
• Private healthcare and wellbeing benefits
• Pension and life assurance
• Professional development and training
• Enhanced annual leave and flexible benefits

If you're a Web engineer that has an interest in the world of Cyber Security then please click apply now!