Full Stack Engineer (Contract)

Work on Technology That Protects What Matters

At SiXworks, we build secure digital solutions that support Defence and National Security missions. Our teams work on complex problems where reliability, security, and speed of innovation matter.

We’re looking for a Full Stack Engineer who enjoys solving difficult technical challenges and wants their work to have real operational impact.

What You’ll Do

As a Full Stack Engineer, you’ll help design, build, and deliver secure digital solutions in highly secure environments. You’ll work alongside engineers, architects, and delivery specialists to develop technology that enables faster, safer decision-making for critical operations.

Your work may include:

• Collaborate with the Technical Lead to develop and contribute to the High Level and Low Level Designs (Frontend, backend and APIs) for Pj BLUTO.


• Define data models and database schemas.


• Enable integration of AI/LLM engineering strategy to the overall design.


• Develop and build UI/UX interface.


• Contribute, in collaboration with QA tester, to the experimental testing strategy to enable outputs


• Writing clean well documented code.

What We’re Looking For

We value people who take ownership, think critically, and enjoy working as part of a collaborative team tackling complex challenges. You don’t need to tick every box, but we’re particularly interested in people with skills/experience in:

• Previous experience as a full stack developer


• Extensive experience working with: PostgreSQL, Python, React, JSON


• A moderate to strong level of experience of working with LLM and other AI approaches GenAI, demonstrating how to integrate this into viable technical solutions.


• ASP (Answer Set Programming) or other logic programming language


• Experience dealing with geospatial file formats 


• Expertise in optimisation problems 

Just as important are curiosity, strong problem solving ability, and the motivation to continuously improve how technology is designed and delivered.

About SiXworks

SiXworks is a specialist digital innovation partner delivering secure, mission-critical technology to Defence and National Security organisations. We focus on digital experimentation, secure-by-design architecture, cloud technologies, and rapid application development to help our customers move faster and stay ahead of evolving challenges.

Our team combines expertise from across technology, business, and operational backgrounds including the armed forces creating a collaborative environment where practical thinking and innovation thrive.

Why Join Us

Our culture is guided by six principles: Agility, Security, Innovation, Quality, Collaboration and Inclusivity our North Star for how we work. SiXworks is a leading provider of secure digital solutions, specialising in digital experimentation and focused on fail-safe-fast cutting-edge technology solutions deployed in highly secure environments.

As an end-to-end digital innovation and delivery partner, we turn complex challenges into mission-critical digital advantages. This is a thrilling time for us, with ambitious plans for growth. We are looking for brilliant, experienced, driven and self-motivated people to join the team on our journey.

A word on UK Security Clearance 

Due to the secure nature of the position and working environment, you must have or be eligible to obtain Security Clearance. More details relating to UK Security Clearance can be found here:  

United Kingdom Security Vetting: clearance levels - GOV.UK (www.gov.uk) 

Interested? 

Please apply!