Mechanical Engineer

About the Opportunity

The Decommissioning Alliance (TDA) is a strategic partnership, operating within the DNWP framework and delivering critical decommissioning work at Sellafield, including the UK’s most challenging Legacy Ponds facilities. As a key partner within DNWP, TDA contributes to Sellafield Ltd.’s mission while ensuring communities, supply chains, and stakeholders benefit from meaningful, measurable Social Value outcomes.

TDA now has an exciting opportunity for an experienced Mechanical Responsible Engineer with site experience supporting the Retrievals East River programme within the TDA. This role will work closely with both client and supply chain teams. It offers the chance to join an established team on an emerging project at Sellafield, delivering a project of national importance in a dynamic and forward‑thinking environment.

The successful candidate will work closely with the Project Engineering Manager, multi‑disciplinary project teams, and the Client on a fast‑paced project.

• 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.
• 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.

• Hold an HNC/HND in Mechanical Engineering (or equivalent qualification).
• Hold an SQEP RE role or equivalent.
• Demonstrate strong plant knowledge and experience working within an operational environment.
• Have working experience using CIMAGE on the SL System.
• Have a positive can‑do attitude, excellent communication and collaboration skills, and the ability to work effectively across diverse project teams.
• Must hold or be able to obtain appropriate Security Clearance (SC and British Sole National) and be a Sellafield pass holder.

In addition to the benefits you’d expect, UK employees also receive free single medical cover and digital GP service, family‑friendly benefits such as enhanced parental leave pay and free membership of employee assistance and parental programmes, plus reimbursement towards relevant professional development and memberships. Work‑life balance and flexibility is a key focus area for us. We’re happy to discuss hybrid, part‑time and flexible working hours, patterns and locations to suit you and our business.