Job Title: Principal Systems Engineer Duration: 12-Month Rolling Contract Location: On-site South West England (Hybrid with on-site presence required) Hourly Rate: £70.00 £80.00 (Inside IR35) Clearance: Current SC Clearance (or eligibility) required Principal / Senior Systems Engineer We are seeking an experienced Principal / Senior Systems Engineer to support a long-term, high-security engineering programme focused on delivering advanced systems solutions across aerospace, defence, and marine domains. This role involves full lifecycle systems engineering, from requirements management through to integration, verification and validation, and delivery of complex platform-based systems. Requirements: Proven experience as a Senior or Principal Systems Engineer within defence, aerospace, or maritime sectors Strong understanding of systems engineering lifecycle, including requirements capture, architecture design, integration, and VandV Hands-on experience with integration and qualification activities Ability to contribute to bids, technical estimates, and work package planning Current SC Clearance (or ability to obtain) UK work authorisation required Desirable: Familiarity with system modelling and analysis (e.g., SysML, MBSE) Experience with trade studies, concept assessments, and performance analysis Strong documentation skills for design reports, test plans, and compliance evidence Degree or HND in an engineering discipline (systems, electronics, or similar)Please send you