Copello arepartnering with a leading defence client in Portsmouth to recruit an Assembly Fitter to join them on a permanent basis. Key Responsibilities: Assemble and align large multi-component seals using hand tools and lifting equipment. Cut, bond, and test rubber parts to specification. Conduct high-pressure water and air testing on assemblies. Ensure all assemblies meet torque, alignment, and test specifications. Support engineering with development, assembly, and testing. Requirements: Experience in a production or engineering environment. Strong mechanical/assembly aptitude. Ability to read and interpret technical drawings is essential. Full, clean drivers license. College education or relevant manufacturing experience preferred. Familiarity with Microsoft Office/MRP systems. Experience with high-pressure test machinery (air & water) is a plus. This is a physical role, however reasonable adjustments can be made where required. Hours: MonThurs: 8:304:30 | Fri: 8:303:30