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.


Why This Role Matters

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.


What You’ll Do

*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


Requirements (Must Have)

*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


Nice to Have

*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


Benefits

*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.


Full Stack Engineer (TDD / C# / JavaScript)