Senior Mechanical/Civil Engineer - Nuclear Decommissioning Warrington (Hybrid - minimum 3 days on site) Contract Opportunity | BPSS clearance required £51-56/hour Umbrella Make an Impact on the UK's Most Complex Nuclear Challenges We're looking for a Senior Mechanical or Civil Engineer to join a small, specialist team tackling some of the most demanding projects in the nuclear sector, supporting retrieval and remediation work on the Magnox Swarf Storage Silo (MSSS) at Sellafield. This is your chance to deliver meaningful, safety-critical engineering that directly reduces the UK's nuclear hazard. The Opportunity You'll be at the forefront of developing solutions for the Outbound Logistics Module (OBLM) and MSSS leak management. Expect to work largely autonomously or in a tight-knit team (2-3 people) on complex R&D and engineering challenges-including silos and ponds systems. You'll own and lead technical work packages from scoping through delivery and regulatory engagement. Your Role Will Include: Leading packages of technical work with minimal supervision Scoping and specifying technical activities Producing and presenting NFRs and reports Checking and reviewing team outputs Planning future technical scope (from study through design transition) Engaging with regulators on allocated work packages What We're Looking For: Chartered status in a relevant engineering discipline Strong nuclear industry experience, ideally including Sellafield MSSS and Silos Ability to work independently and take ownership of complex problems Mechanical Handling and Heavy Lifting experience essential Proven understanding of Technical Files and Safety Case requirements We're especially interested if you have at least 4 of the following: Technical Assessment and Review Study Delivery Strategy Development Technology Development / R&D Plant Trials Early Design Delivery (Study/Concept phases) Project or Programme Management Why Join? Work on some of the UK's highest-priority nuclear decommissioning challenges Tackle cutting-edge R&D solutions with real impact on safety and environmental outcomes Hybrid working with strong on-site team collaboration Join a professional environment that values autonomy, expertise, and leadership Ready to take on a role where your experience really matters? Apply today and help shape the future of nuclear decommissioning at Sellafield