Back End Developer, Engineering, Defense & Security (DV clearance required)

City of London, United Kingdom Posted on 05/02/2026

Contract Job Title: Back End Developer, Engineering, Defense & Security (DV clearance required)

Contract Start Date:March 2026

Contract Length: 12 months, with potential extension

Contract Classification: Inside IR25

Contract Location: London, Bristol or Manchester with hybrid working (2/3 days in the office)

Mandatory requirement: Must have DV Clearance

Role Overview:

We are proud of the impact we have with our Defence & Security clients, the strength of our relationships, and the variety of our skills and expertise that we bring to help them achieve their mission. We're growing our teams across all of Technology and Transformation.

If you are cleared DV level, we are very keen to hear from you.

Are you able to guide defense users through complex technology challenges, and rapidly develop new solutions to meet defence needs? We are looking for individuals to help digitise defense with new thinking on technology capabilities and adoption processes, and someone who is sensitively able to combine the latest thinking with traditional military functions.

You will guide our clients through their digital journey from strategy through to a working and breathing environment supporting their most critical services.

Building robust and scalable digital platforms that enable teams to deliver modern micro-services based and digital solutions to continuously improve environments through automation and infrastructure-as-code.

You will work with colleagues across back and front-end developers, creatives and UX experts, integration teams and the client themselves.

Key Responsibilities:

• Help deliver features end to end. We don't throw our work "over the wall," everyone is expected to pull together to design new features and figure out bugs
  
• Deliver cloud native and containerised applications using technologies including AWS Lambda, Spring Boot, NodeJS, Python FastAPI, Oracle, PostgreSQL and MongoDB
  
• Build solutions as part of a DevSecOps and Agile ecosystem supported by tooling including Atlassian, Jenkins, GitLab, OWASP and AWS component
  
• Ensure your solution works in a reliable and resilient way using Site Reliability Engineering methods to increase availability while reducing costs and callouts
  
• Help the client and end users to understand trade-offs when making product decisions and explain why you would do things a certain way
  
• Keep learning! We are a learning organisation and have a great community of architects and back-end developers who run workshops together, share the best articles they find on Slack, and contribute to the engineering culture
  

• All applicants must hold UK security clearance to Developed Vetting level.
  
• Candidates will have hands on experience with one or more technologies relevant to these areas:
  
• Experience in software development and an evident passion for writing code.
  
• Demonstrable experience and understanding of working in teams, particularly in agile methodologies such as Scrum & Kanban.
  
• Overall, you're an ideas person and problem solver as well as a hands-on doer - that's important. And you know it takes a mix of people to do amazing work, so you love collaborating with and learning from people with different skills, backgrounds, and perspectives. If you have an interesting or unusual mix of skills yourself, even better.
  
• We're looking for people who are natural initiative-takers who bring out the best in others, are brilliant listeners and can help us grow our business without compromising standards, integrity, or culture.