Job Title: Principal Systems Engineer Location: Portsmouth - Hybrid 3+ days per week on-site Role Type: Permanent Salary: £57,000 depending on experience + 10% bonus Our client, an established defence firm, require an experienced Principal Systems Engineer to join their multi-disciplined team based in Portsmouth. Candidates would need to be eligible for UK SC Clearance - 5+ years residency in the UK and right to work (no sponsorship). As a Principal Systems Engineer you will support the delivery of one or more of the core marine engineering service elements; Design Change Management, Platform Technical Assurance, Material State Management, Obsolescence Management, Specialist Engineering Support, Future Support and Transformation Planning. What the role of the Principal Systems Engineer entails: Some of the main duties of the Principal Systems Engineer will include: You will understand the full problem space, surface constraints and emergent behaviours, balance trade-offs (performance, cost, schedule, safety, security), and define clear, testable success criteria. Define and maintain how a system works and how they interact; keep interfaces stable; record key decisions and trade-offs; and support bids and concept studies with evidence-based architectures You will work with stakeholders to capture, decompose and agree requirements; set acceptance criteria; maintain end-to-end traceability; and manage change with clear impact assessments You will champion and govern MBSE ..... full job details .....