Full Stack Engineer (TDD / C# / JavaScript)

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)