Job Title: Principal Systems Engineer Location: Portsmouth Naval Base - On site Salary: Up to £58,000 depending on skills and experience + 10% bonus Who we are: Join BAE Systems and you''ll be part of something bigger. As a valued member of our global colleague network, you''ll bring your unique skills and perspectives to help pioneer progress and protect what matters most. You''ll be trusted to play your part in delivering the advanced, technology-led defence, aerospace and security solutions of tomorrow, shaping a safer future, for all of us. From the depths of the ocean, to the far reaches of space, there''s no limit to where a career at BAE Systems could take you. What you''ll be doing: In this position you will be applying Systems Thinking to understand the wider problem space, manage constraints and emergent behaviours, and balance key trade offs while shaping Architecture and Interfaces that define how systems work and interact. You will deliver strong Requirements Leadership and Management by capturing, decomposing and agreeing requirements, maintaining traceability and managing change. The role will champion Model Based Systems Engineering (MBSE) by modelling system behaviour, structure and interfaces, ensuring modelling standards are followed, and generating controlled outputs that support design, verification and validation. In addition, you will also apply Problem Decomposition and Complexity Management to break down multi domain challenges , visualise ..... full job details .....