Full Stack Engineer (TDD / C# / JavaScript)
CV-LibraryWarringtonpermanentPosted: 10 April 2026
Apply NowFull 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)
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)