Web Developer

develop; Greater London; Hybrid; GBP 86,000 - 105,000; Full time

Benefits offered by this job

Equity/share options

Bonus up to 10%

Remote working

London travel (1–2 times/month)

Private healthcare

Pension and life assurance

Professional development

Flexible benefits

Job summary

develop is seeking a Senior Web Engineer to join a security-focused product team. This remote-first role blends web development with application security, exploring authentication, cryptography, and advanced defense techniques.

You’ll collaborate with engineers, security specialists and product stakeholders to design robust client-side protections, deploy defensive controls, and promote secure software practices across the roadmap. Occasional travel to London will be required.

Qualifications

• 5+ years of professional web development experience.
• Some experience with application security, cryptography, secure communications and authentication.

Responsibilities

• Engineer defensive controls for software running in untrusted client environments.
• Develop mechanisms to detect and respond to unauthorised modification, inspection, manipulation and automated interaction.
• Identify weaknesses across client-side architectures and turn security research into deployable solutions.
• Collaborate with engineers, security specialists and product stakeholders to embed security from design to production.
• Lead investigations into complex security issues and engineer preventive solutions.
• Influence architectural decisions around security, resilience, performance and client-side trust.
• Share specialist knowledge to help teams adopt stronger secure design and implementation.

Skills

Web development

App security

Cryptography

Secure communications

Authentication

Job description

Senior Web Engineer | Product Security | Remote first, 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:

• 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.
• Identify weaknesses across client-side application architectures and turn security research into deployable engineering solutions.
• 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.
• Some Experience with App Security, cryptography, secure communications and authentication.

Nice to have:

• 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
• WebGPU, WebRTC, or WebCodecs
• Binary instrumentation and compiler toolchains
• SDK and developer platform development
• 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