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!

Work arrangement
No