An opportunity has arisen for an experienced Mechanical Design Engineer based at Sellafield within pond mechanical handling experience to design rigs, tools and storage racks to join the TDA Project Design Team. You should be a British Citizen and passport holder and not have worked outside the UK during the past 5 years. Candidates can start with BPSS security clearance whilst higher level clearance is being undertaken. This is a full time contract position inside IR35 with a requirement to spend a minimum of 3 days per week in the Whitehaven offices or Sellafield Site when required. This is an exciting opportunity to become part of an established team working on an emerging project at Sellafield. This role offers the chance to work in a dynamic and forward-thinking environment to deliver a project of national importance. The successful candidate will work closely with the Project Engineering Manager, multi-disciplinary project teams, and the Client on a fast-paced project. ROLE RESPONSIBILITIES Ensure all plans, drawings, and quantities are accurate and suitable for engineering calculations. Manage and control design documentation, including drawings and technical specifications. Maintain configuration control of engineering deliverables. Liaise with Sellafield (SL) designers and other discipline teams to ensure compliance with design and construction regulations. Provide regular progress reports and updates to the Mechanical Responsible Engineer. Plan and prioritise work effectively, adapting to setbacks and resolving technical challenges as they arise. Use AutoCAD, Navisworks, and 3D scanning software proficiently to enable accurate transfer of site data to the design team. Provide input and technical support as required for Design and Constructability Reviews. ESSENTIAL EXPERIENCE & QUALIIFICATIONS Hold an HNC/HND in Mechanical Engineering (or equivalent qualification). Demonstrate strong plant knowledge and experience working within an operational environment. Have working experience using CIMAGE on the SL System. A positive can-do attitude, excellent communication and collaboration skills with the ability to work effectively across diverse project teams. Must hold appropriate Security Clearance (SC and British Sole National) and be a Sellafield pass holder.