Copello is seeking an experienced Mechanical Design Engineer to join an existing team on a 3-month contract working on a UK Eyes Only (UKEO) defence/aerospace programme based in the Buckinghamshire area. Key Responsibilities * Contribute to an R&D, prototype, or NPI environment, supporting new product development. * Create detailed technical drawings, schemes, and 3D models using SOLIDWORKS. * Produce tooling drawings and documentation to support manufacturing processes. * Collaborate with engineering, manufacturing, and project teams to deliver high-quality design solutions. Skills & Experience * Strong background in defence/aerospace mechanical design. * Proven expertise in SOLIDWORKS (3D CAD). * Experience producing detailed technical drawings, schemes, and tooling documentation. * Familiarity with prototype, R&D, or NPI programmes. Role will require the successful candidate to be onsite 4 days a week. Role will require candidates to have active SC clearance or eligibility for SC. Role is paying circa £55-£60 per hour (inside IR35)...