Salary: £70,000 - 70,000 per year Requirements: We are looking for strong commercial experience developing full-stack software applications using Java and modern front-end frameworks such as React. We require previous experience operating at Senior, Lead, or Principal Engineer level. We need a strong understanding of software architecture, API design, and scalable distributed systems. We are looking for experience building cloud-native applications and working within AWS, Azure, or similar cloud environments. We require strong knowledge of DevOps tooling, CI/CD pipelines, containers, and automation. We need experience delivering secure, production-grade systems within agile teams. We are looking for excellent communication, stakeholder engagement, and technical leadership skills. We want someone with a passion for balancing hands-on engineering with mentoring and leadership responsibilities. Experience working within Government, Defence, or National Security environments is highly desirable. Familiarity with secure or classified programmes is a plus. Knowledge of ITSM or operational support environments is beneficial. Experience working within highly regulated or mission-critical sectors is advantageous. Responsibilities: We lead the design, development, and delivery of secure full-stack applications using Java, React, and modern web technologies. We build scalable back-end services, APIs, and distributed systems. We develop responsive and user-focused front-end applications using React and associated frameworks. We design and maintain cloud-native solutions across AWS, Azure, and private cloud environments. We drive DevOps and automation best practices including CI/CD, containers, and infrastructure-as-code. We support and mentor engineers within agile delivery teams. We collaborate closely with clients, stakeholders, architects, and multidisciplinary teams to shape technical solutions. We contribute across the full software development lifecycle, from discovery and architecture through to deployment and production support. We promote engineering excellence, clean coding standards, and continuous improvement across teams. Technologies: API AWS Azure CI/CD Cloud DevOps Support ITSM Java React Security Web Fullstack More: We are a growing, mission-led consultancy delivering secure and modern software solutions across the UK Government and Defence sectors. This is an exciting opportunity for an experienced Principal Full Stack Software Engineer to join our collaborative and forward-thinking engineering team, where you will remain hands-on across both back-end and front-end development while also helping shape technical direction and mentoring teams. We offer flexible remote and hybrid working options, a 37.5-hour working week, a learning and development budget for certifications, conferences, and training, private healthcare, a matched pension scheme, monthly socials and quarterly company meetups, and clear progression opportunities into senior technical and leadership positions. We are committed to an inclusive environment where everyone feels supported, valued, and able to thrive, and we welcome applications from individuals of all backgrounds and experiences. last updated 20 week of 2026