We are seeking an exceptional Principal Systems Engineer to join a pioneering team developing next-generation in-space systems. This is an exciting opportunity to contribute to complex space missions, including full spacecraft lifecycle development from concept through prototyping, detailed design, integration, testing, launch, and operations. About the Role As Principal Systems Engineer, you will provide expert insight, practical problem-solving, and technical leadership across multiple flight development programmes. You will work closely with colleagues and partners across Europe to establish robust system architectures, define clear requirements, and enable innovative satellite servicing missions. You will draw on your breadth of experience developing complex systems within budget and on schedule, bringing passion for space systems engineering, whether across large or small space missions, or other technically challenging projects. Key Responsibilities Define system architecture for spacecraft, interfacing with all subsystem leads, external partners, and key suppliers Perform analysis and modelling of spacecraft systems Manage development schedules, system requirements, and design budgets Guide systems engineering processes and facilitate technical trades across disciplines Control and trade-off platform systems budgets (mass, power, data, fuel) Perform top-level mission analysis and support the development of internal too...