Job Title: Systems Engineer / Architect (C3 and Payload Integration Lead) Location: Salisbury / Chilmark, Wiltshire (Hybrid: 3 days/week onsite) Domain: Uncrewed Aerial Systems (UAS), Flight Control Avionics, Power Distribution Clearance: UK SC Cleared or SC Eligible (Day 1 BPSS mandatory)The RoleLead the architectural integration of 3rd-party COTS payloads (radios, GPS, AI vision/LIDAR hardware) onto advanced UAV platforms. Operating within fast-paced 4-week agile sprints, this is a hands-on, highly technical role focused on first-principles engineering and physical calculations rather than heavy process documentation.Core ResponsibilitiesArchitecture and Integration: Draft Interface Control Documents (ICDs) and logical connection methodologies between 3rd-party sensors, edge processors, and flight control units.First-Principles Engineering: Execute calculations in Excel/Python for RF link margins, power distribution budgets, and thermal/mass balances.RF and Communications: Evaluate EMC/EMI considerations, optimize antenna placement, and assess radio performance characteristics across Command, Control and Communications (C3) equipment.Hardware Review: Review avionics schematics in Altium/KiCad and manage change control through PLM/DDM systems.Required Skills and DNAExperience: 5 to 8 years in fast-paced UAV, robotics, or agile defence SME environments.Technical Stack: Strong knowledge of CAN bus, Ethernet, Serial protocols, and C3 radio links.Tools: Python/Excel for ..... full job details .....