Full Stack Engineer (National Security)

Full Stack Software Engineer

Location: Cheltenham

Business Unit: National Security

Employment Type: Permanent or Contract

Clearance: Must hold active UK Security Clearance

About the Opportunity

We are partnering with a leading Engineering business seeking experienced Full Stack Software Engineers to help deliver mission-critical capabilities that protect the UK's security and prosperity. You will work at the intersection of advanced engineering and real-world problem-solving, developing cutting-edge products that counter evolving threats.

Our teams work with leading technologies across AI/DS, Cyber, Cloud, DevOps/SRE, and Platform Engineering, supporting customers across the National Security, Defence and Intelligence community. With long-term programmes secured, this is an opportunity to join a high-growth environment with genuine impact.

What You'll Be Doing

• Designing, developing, and delivering secure, high-quality software solutions.
• Producing clean, test-driven code and ensuring adherence to engineering best practice.
• Translating logical designs into physical implementations and producing detailed designs.
• Integrating UI/API components with existing data stores and services.
• Maintaining and enhancing architectural elements such as data ingest pipelines, data stores and REST APIs.
• Collaborating with user researchers, product teams, and customers to align solutions with real user needs.
• Participating fully in Agile ceremonies: sprint planning, daily stand-ups, demos, and backlog refinement.
• Contributing to technical strategy, innovation, and tactical upskilling across emerging technologies.

Key Skills & Experience

• Strong commercial experience with Spring Boot and Java Enterprise development.
• Front-end proficiency with React, Vue.js, or AngularJS.
• Experience with modern testing frameworks and TDD.
• Ability to work across UI, API, and data layers.
• Technically curious and willing to adopt emerging tools and approaches.
• Strong documentation and design discipline.

Why Join?

You'll be part of a trusted engineering organisation with over 60 years of heritage in sensors, communications, cyber, AI and ML. They solve complex challenges that make a tangible difference protecting people, platforms and missions, today and for the future.