Full Stack Engineer (TDD / C# / JavaScript)

We are hiring a Full Stack Software Engineer with a strong test-driven development (TDD) background to help build the next generation of a mission-critical cybersecurity and communications platform used globally.

This is a hands-on role focused on designing and delivering partner API integrations across a complex security ecosystem - including endpoint protection, network security, user awareness tooling, and monitoring systems.

You'll work as part of a collaborative product team alongside full stack and front-end developers, supported by QA and DevOps, reporting into engineering leadership.

The next-generation platform will provide customers with a unified view of security across distributed environments. As integrations expand, maintaining a high bar for quality, reliability, and test coverage is critical.

This role will also play a key part in strengthening TDD practices across the team - leading through code and delivery.

• Design and build API integrations across a cybersecurity-focused product stack
• Deliver clean, maintainable full stack solutions using .NET and modern JavaScript frameworks
• Lead by example in test-driven development practices
• Integrate third-party systems using REST APIs, OAuth2, webhooks, and resilient patterns
• Contribute to a scalable, observable integration layer
• Collaborate with Product, QA, and DevOps to deliver high-quality releases
• Use AI-assisted development tools as part of your daily workflow

• Experience with C# / .NET Core
• Strong experience with ASP.NET Core / Web API
• Modern JavaScript / TypeScript experience
• Experience with a component-based SPA framework (e.g. Vue, React, or Angular)
• Proven, hands-on test-driven development experience
• Strong experience integrating third-party APIs (REST, OAuth2, webhooks, retries, rate limiting)
• Solid SQL skills (e.g. MariaDB or MySQL)
• Experience with Git workflows (branching, pull requests, code reviews)
• Regular user of AI-assisted development tools (e.g. Claude Code, Cursor, Copilot or similar)
• Strong ownership mindset and commitment to quality

• Commercial experience integrating AI APIs (e.g. Claude, Bedrock, OpenAI or similar)
• Experience with AWS (e.g. EC2, RDS, Lambda, S3)
• Microservices or distributed systems experience
• Familiarity with iterative product development methodologies
• Awareness of secure-by-design principles (e.g. ISO 27001)
• Background in SaaS or cybersecurity environments

• Hybrid working
• Excellent career development / Training budget
• Flexible working

If you take pride in writing well-tested, production-grade code and want to contribute to building critical cybersecurity software used at global scale, we'd love to hear from you.