Join a growing consultancy delivering secure, mission-critical technology across some of the UK’s most sensitive and complex environments. As a Software Engineer, you’ll help build high-impact digital solutions that support critical operations, working alongside multidisciplinary teams solving genuinely challenging problems.
Role Overview
Location: Cheltenham, London or Manchester (with significant client-site travel)
Package: Competitive salary + comprehensive benefits package
Industry: Security, Intelligence & Defence Consulting
What You’ll Be Doing
- Design, build and maintain secure software applications, APIs and services within highly secure environments.
- Develop modern full-stack and backend solutions using technologies such as Java, JavaScript, TypeScript, Python or C++.
- Build scalable, distributed systems to support mission-critical workloads, data processing and analytics.
- Develop APIs, microservices and event-driven architectures that power secure digital services.
- Collaborate with architects, DevOps engineers, testers and data specialists to deliver production-grade software.
- Contribute to software design decisions, architecture discussions and technical documentation.
- Apply modern engineering practices including clean code, testing, peer reviews and secure development standards.
- Support DevSecOps delivery through CI/CD pipelines, cloud-native services and containerised deployments.
- Integrate software with cloud, streaming and data platforms across complex technology estates.
- Implement monitoring, logging and observability to support stable, secure live services.
Main Skills Needed
- Experience working within UK Security & Intelligence, defence or other secure government environments.
- Strong software engineering experience across modern development frameworks and secure application delivery.
- Proficiency in one or more languages such as Java, JavaScript, TypeScript, Python or C++.
- Experience developing APIs, backend services and full-stack applications.
- Strong understanding of distributed systems, microservices and event-driven architectures.
- Experience working with cloud-native technologies, particularly AWS and containerised environments.
- Knowledge of DevSecOps principles, CI/CD pipelines, automated testing and secure coding practices.
- Ability to work effectively within Agile, multidisciplinary engineering teams.
- Current high-level UK security clearance is essential.
What’s in It for You
- Flexible working with a blend of remote and onsite delivery.
- 25 days holiday plus your birthday off, with the option to buy or sell additional leave.
- Private healthcare with family upgrade options.
- Ongoing learning and development opportunities to support your technical growth.
- Fitness reimbursement to support an active lifestyle.
- Life assurance and pension contributions to help you plan ahead.
- Access to employee perks and discounts across a wide range of products and services.
- Internal recognition schemes celebrating exceptional contributions.
- Opportunities to get involved in volunteering and community initiatives.
- Meaningful projects delivering real-world impact in secure, high-profile environments.
Call to Action
Big plans. Big impact. Ready to be part of it?
We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.
By applying you are confirming you are happy to be added to the Addition Solutions mailing list regarding future suitable positions. You can opt out of this at any time simply by contacting one of our consultants.
