Job Description Are you an experienced Systems Engineer ready to tackle exciting challenges in the defence and marine sectors ? At ALTEN, you'll work on cutting-edge submarine systems, driving innovation and delivering solutions for mission-critical projects. This is your chance to be part of something extraordinary in a dynamic and supportive environment. Key Responsibilities: Deliver full-lifecycle systems engineering, working across the V-Model to develop, test, and validate advanced solutions. Define and manage system requirements, ensuring seamless alignment with project goals and performance criteria. Collaborate on subsystem integration for complex electronics systems in submarine platforms. Troubleshoot and resolve system-level challenges to meet demanding operational standards. Support testing and validation, ensuring systems perform reliably under challenging conditions. Location: Portsmouth, with a hybrid working model .