Principal software engineer

Salary: £70,000 - 75,000 per year Requirements: We require a degree in engineering, mathematics, or a science-based subject, or equivalent experience. We require significant experience in embedded product development, including bare-metal and RTOS environments such as Linux or ThreadX. We require expertise in C and C++, with a strong grasp of object-oriented design and design patterns. We require familiarity with software testing, defensive coding standards, version control, and automated testing tools. We require candidates to be eligible for UK security clearance. We require a proactive approach to problem-solving and a commitment to delivering high-quality solutions. Responsibilities: We architect, design, develop, and test embedded and application software, ensuring high-quality and timely deliverables. We apply object-oriented design techniques to enable efficient code reuse and integration with testing frameworks. We review system design artefacts to derive software requirements and architecture aligned with high-level system objectives. We develop and maintain knowledge of best practices in software development, including TDD/BDD, DevSecOps, and secure coding standards. We mentor junior engineers, provide technical leadership, and contribute to improving tools, processes, and techniques. We generate technical proposals and accurate estimates for bids and projects, ensuring cost and schedule adherence. We lead the design, architecture, and delivery of secure embedded and application software across the full software lifecycle. We support bids, cost estimation, and technical reviews. We work across multiple concurrent projects with varying scales and complexity. Technologies: Architect DevSecOps Embedded Support Linux Security TDD C++ More: We are offering a senior Principal Software Engineer role in our cutting-edge defence technology team, where innovation meets impact. This is a full-time onsite position based in Maidenhead. You will work in a dynamic and collaborative environment delivering innovative cryptographic and key management solutions that support secure communication for customers worldwide. We offer excellent benefits including private medical cover, flexible working hours, and participation in an annual bonus scheme. This role combines hands-on development with technical leadership and strategic input, helping us shape advanced cyber and defence programmes and protect lives. last updated 24 week of 2026