Role : Principal Infrastructure Engineer - Facility & Building Upgrade Location : Salisbury (3 days per week on-site) Duration : 6 months Rate : Negotiable Inside IR35 - Umbrella only SC Cleared Lead the technical delivery of complex Test, Trials, Training and Evaluation (T3E) infrastructure projects at Boscombe Down, focused on aviation facilities and associated test environments.? Role overview Act as Principal Systems Engineer across the full lifecycle, from requirements through to transition into service.? Produce and own key artefacts: requirements, architecture, ITEA plans, installation and acceptance documentation, technical files.? Plan and lead installation, integration, test, evaluation and acceptance to deliver safe, compliant, safe by design solutions.? Provide technical leadership to internal teams and subcontractors, acting as System Design Authority where required.? Engage stakeholders across facilities, IT, safety and security to manage requirements, risks and change.? Skills and experience Strong systems engineering background on complex infrastructure, test ranges or safety-critical environments.? Advanced knowledge of systems integration (facilities, equipment, control systems, comms, software, IT).? Familiar with relevant standards and frameworks (e.g. CDM 2015, SCIDA, aviation test facilities, RIBA stages).? Proven experience leading multi-disciplinary engineering teams and managing technical risk.? Qualifications Degree in Systems Engineering or relevant engineering discipline (MSc preferred) or equivalent experience.? Chartered Engineer (CEng) or equivalent / working towards.? To apply, please send your CVs in the first instance.