Senior Power System Engineer (Contract)

Location: London, UK (Hybrid)
Duration: 6 months
Start Date: January
Engagement: Outside IR35

A leading space engineering programme is seeking an experienced Senior Power System Engineer to support spacecraft power subsystem development on a 6-month outside IR35 contract.

The successful engineer will take technical ownership of spacecraft power systems across multiple mission phases-from initial architecture definition and requirements engineering to hardware procurement, integration, testing, and operational support. This is a high-impact role suited to someone with strong spacecraft power electronics expertise and hands on integration experience.

• Lead end-to-end engineering of spacecraft power subsystems, covering both high-level architecture and detailed electronics design.
• Serve as the technical point of contact for all power/avionics topics, engaging with internal teams, customers, and subcontractors.
• Perform requirements analysis, flow-up and down, and interface definition for spacecraft power systems.
• Develop and maintain power subsystem architectures and mission-aligned design documentation.
• Create and manage spacecraft power budgets, load analyses, and parametric models.
• Analyse EMC constraints and define effective mitigation strategies for power subsystems.
• Support definition and specification of power-related test equipment and ground support hardware.
• Define verification and validation strategies, test plans, and test procedures.

• Support integration and testing of power subsystem hardware throughout the project lifecycle.
• Generate test and verification reports, technical dossiers, and system documentation.
• Participate in system-level integration, environmental tests, and verification campaigns.
• Provide engineering support for operational activities, including in-orbit procedures and subsystem performance monitoring.
• Contribute to internal and customer design reviews with up-to-date technical documentation.

• Prepare and support Requests for Proposals (RFPs) for power-related avionics units.
• Review supplier responses and support technical down-selection.
• Provide technical oversight of procured hardware, ensuring performance, interface, and quality compliance.
• Review power electronics aspects of spacecraft equipment across engineering disciplines.

• Support the development of next-generation spacecraft power architectures.
• Contribute to detailed design activities for in-house power electronics hardware.
• Assist with concept studies, trade off analyses, and early phase architecture modelling.

• Professional experience as a Power System Engineer or Power Electronics Engineer within the space or aerospace domain.
• Strong understanding of spacecraft power subsystems: power conversion, distribution, energy storage, regulation, and protection.
• Hands on experience with spacecraft or avionics hardware integration, verification, and environmental testing.
• Strong familiarity with systems engineering processes, requirements management, and interface control.
• Knowledge of EMC constraints and mitigation techniques for space hardware.
• Experience managing suppliers and reviewing technical deliverables.
• Strong documentation skills, including test plans, DDVPs, FMEAs, and design review material.