Role: Software Engineer Grade: £45k - Junior (2-3 years) up to Lead/Principal levels (7-10 years) - £80k Location: Gloucester, United Kingdom Job Type: Full-time, Permanent Schedule: 4xFlex (37.5 hours/week) Security Clearance: Must be eleigible for SC/DV clearance About the Opportunity Our client is a global leader in advanced technology solutions for defence, security, and aerospace, with a proud legacy of delivering cutting-edge software and mission systems. They are now seeking a Software Engineer to support a range of high-impact programmes within their Defence, Cyber, and Intelligence portfolio. Please note: To be considered for this role, you must be eligible for UK security clearance at DV (Developed Vetting) level. Based in Gloucester, this is an opportunity to be part of a collaborative, high-security environment where your contributions will play a critical role in national infrastructure and digital resilience. What You’ll Be Doing As a Software Engineer, you’ll work across the full software development lifecycle within a secure delivery environment. You may focus on one area or operate across multiple disciplines with an emphasis on DevSecOps and secure software engineering. Responsibilities include: Designing and developing robust, testable software solutions Debugging and correcting code while following secure coding best practices Collaborating with stakeholders to refine software based on mission needs Building and maintaining CI/CD pipelines using GitLab and other tools Preparing documentation and contributing to system design reviews Supporting junior engineers and contributing to agile team delivery ✅ What You’ll Bring We’re looking for a Software Engineer with strong technical foundations and a passion for building secure, scalable systems. Key skills & experience: Proficiency in Java (and other languages such as Python) Experience with Linux-based development environments Solid knowledge of unit testing frameworks like JUnit 5.x Strong experience with Git, CI/CD pipelines, and Agile (SCRUM) methodologies Familiarity with Oracle/MongoDB, React, TypeScript, Apache NiFi, Elasticsearch Experience mentoring junior team members Bonus points for: Exposure to AWS cloud services (e.g. EC2, Lambda, S3, EKS) Knowledge of serverless and microservice architectures Experience in developing software for cloud deployments Hands-on with the Atlassian suite (Jira, Bitbucket, Confluence) Previous involvement in secure government programmes or environments Why You Should Apply As a Software Engineer in this role, you’ll work in a high-trust environment with the flexibility to manage your schedule (4xFlex) while contributing to meaningful and technically complex national programmes. Our client offers a hybrid working model, career progression pathways, and ongoing access to certifications and technical training. Enjoy: A competitive salary and comprehensive benefits Flexible work-life balance and hybrid working 30 days holiday (including bank holidays) Supportive, inclusive work culture Ready to Apply? Whether you’re a passionate mid-level developer or an experienced Software Engineer seeking your next challenge, this is your chance to help shape the future of mission-critical systems in the UK. Apply today to make a lasting impact where it truly matters.