Back End Developer

Join to apply for the Back End Developer role at BAE Systems
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BAE Systems Digital Intelligence is home to 4,500 digital, cyber and intelligence experts. We work collaboratively across 10 countries to collect, connect and understand complex data, so that governments, nation states, armed forces and commercial businesses can unlock digital advantage in the most demanding environments.

Location(s): UK, Europe & Africa – Guildford, London.

As a Back End Developer you will analyse software requirements to define and document REST API endpoints, develop and implement secure REST API endpoints using modern .NET, use appropriate software development tools, follow industry standard disciplines and best practices, collaborate with cross‑functional teams to design and ship new features, translate API requirements into high‑quality, stable, secure and performant code, understand web vulnerabilities and best practices to avoid vulnerable code, troubleshoot and debug issues on various platforms to ensure smooth user experiences, and participate in code reviews to maintain code quality and consistency.

• Analyse software requirements to define and document REST API endpoints
• Develop and implement secure REST API endpoints using modern .NET
• Use appropriate software development tools; e.g., source control, continuous integration
• Follow industry standard disciplines and best practices
• Collaborate with cross‑functional teams to design and ship new features
• Translate API requirements into high‑quality, stable, secure and performant code
• Understand web vulnerabilities and best practices to avoid vulnerable code
• Troubleshoot and debug issues on various platforms to ensure smooth user experiences
• Participate in code reviews to maintain code quality and consistency

• Experience in C#, ASP.NET Core Controller, and Minimal APIs (Essential)
• Experience coding in T‑SQL and MSSQL database best practices (Essential)
• Experience with unit and integration testing using tools such as xUnit (Essential)
• Familiarity with RESTful APIs and integration (Essential)
• Understanding of front‑end build tools such as Vite, NPM (Essential)
• Understanding of CI/CD pipelines using software such as Git Lab (Essential)
• Familiarity with .NET libraries used by BAE Systems, such as Fluent Validation, Dapper, Polly (Preferred)
• Knowledge of modern authorization mechanisms such as JSON Web Tokens and PKI (Preferred)
• Experience using OpenAPI specification tools such as Swagger, NSwag (Preferred)
• Comfortable developing on both Linux and Windows (Preferred)
• Experience with containerisation technologies such as Docker, Docker Compose (Preferred)
• Experience with the Atlassian suite of tools (Jira, Confluence) for development, documentation, and Agile delivery (Preferred)
• Knowledge of the wider Tech Stack used by BAE Systems, such as React, Keycloak, Elasticsearch, NiFi (Preferred)

We are embracing Hybrid Working. This means you and your colleagues may work in different locations, from home, another BAE Systems office, or client site, sometimes all at once, to suit your personal and professional needs. By embracing technology, we collaborate and create together, even when we’re working remotely from one another. Hybrid Working allows for increased flexibility in when and where we work, helping us to balance our work and personal life more effectively, and enhance well‑being.

Diversity and inclusion are integral to the success of BAE Systems Digital Intelligence. We are proud to have an organisational culture where employees with varying perspectives, skills, life experiences and backgrounds can work together to achieve excellence and realise individual and organisational potential.

Entry level

Full‑time

Engineering and Information Technology

Defense and Space Manufacturing