Principal Systems Engineer/IVVQ Engineer- Maidenhead- Permanent-Excellent salary and benefits package.. Join a team redefining defence technology. We are partnering with a team that design and deliver advanced secure systems that protect lives, enable critical missions, and shape the future of defence and cyber capability. Within our Cyber business unit, you will work on cutting-edge cryptographic and key management solutions that enable the secure exchange of sensitive information across tactical and strategic environments. This is an opportunity to lead engineering excellence in systems that demand the highest levels of trust, assurance, and performance. What You’ll Do As a Principal Systems Engineer, you will play a leading role in delivering complex defence and cyber programmes, ensuring robust systems engineering practices are applied across the full lifecycle. You will: * Lead systems engineering activities across major work packages, ensuring delivery on time, within budget, and to specification * Support Engineering Project Leads in delivering technical outcomes aligned to programme plans * Define and develop high-quality technical solutions to complex engineering challenges * Ensure stakeholder and system requirements are fully captured, validated, and realised * Produce and maintain key systems engineering artefacts across the product lifecycle * Contribute to design assurance, technical r...