An exciting opportunity has arisen for a Senior Design Engineer to join a pioneering UK-based specialist in military communications technology, located in Letchworth Garden City. This is a hands-on, multifaceted engineering role ideally suited to an experienced and adaptable electronics professional who enjoys working across the full product lifecycle. You will be supporting high-reliability products used in marine and sub-marine low/very-low frequency (VLF/LF) communications, a field in which the company is globally recognised as a leader. Key Responsibilities for the Senior Design Engineer based in Letchworth, Hertfordshire: Design and modify RF-based electronic assemblies for VLF/LF communication systems. Oversee projects from concept through to production and delivery. Manage sub-suppliers for components and mechanical services (box-build, machining, etc.). Investigate and diagnose faults at component and trace level on new and field-returned PCBs. Generate detailed reports, technical documentation, and engineering change notices (ECNs). Ensure compliance with company health & safety, environmental policies, and quality standards (ISO 9001). Essential Skills & Experience: Strong understanding of electronic and electrical design at the component level. Background in analogue design and low-noise circuit design (LF radio experience advantageous). PCB layout design and familiarity with assembly processes. Proven fault-findin...