Senior Mechanical Engineer Jobs at AtkinsRéalis | jobs in UK

About AtkinsRéalis

AtkinsRéalis is a world-class engineering services and nuclear organisation that connects people, data, and technology to support major infrastructure and energy projects. Its teams include consultants, designers, engineers, and project managers working with clients and industry partners to deliver complex projects.

AtkinsRéalis is currently recruiting Senior / Principal Mechanical Engineers to expand its Derby team and support increasing client demand across the UK nuclear sector. The role provides opportunities to work on a diverse range of complex engineering projects, either within AtkinsRéalis design teams or directly with clients on major programmes.

Role Overview

As a Senior / Principal Mechanical Engineer with AtkinsRéalis, the successful candidate will provide technical leadership across mechanical engineering projects within the UK nuclear industry.

The role involves leading engineering teams, delivering mechanical design and substantiation activities, working with clients and multidisciplinary teams, and supporting projects throughout their lifecycle. The successful candidate will contribute to projects covering reactor operations, nuclear new build, small modular reactors, fusion energy, and decommissioning.

This position is suited to an experienced Mechanical Engineer who can manage complex engineering activities, provide technical guidance, build strong stakeholder relationships, and deliver projects to required time, cost, quality, and safety standards.

Key Responsibilities as Senior / Principal Mechanical Engineer

• Lead engineering teams delivering complex mechanical engineering projects
• Manage mechanical design and substantiation activities across different project stages
• Provide technical input to bids, budgets, schedules, and project planning
• Work with clients to assess feasibility and develop engineering solutions
• Lead detailed design and support construction activities
• Develop mechanical equipment designs and substantiation to appropriate safety and quality standards
• Work closely with multidisciplinary engineering and delivery teams
• Manage project timescales, priorities, and technical challenges
• Provide guidance, mentoring, and technical support to junior engineers
• Present technical information and recommendations to internal and external stakeholders
• Build and maintain effective relationships with clients and project teams
• Support nuclear reactor operations, new-build, decommissioning, and emerging nuclear technology projects
• Contribute to the continued development of engineering capabilities within the business

Shift Pattern & Pay

• Full-time position
• Permanent professional role
• Locations include Derby, Epsom, Bristol, Sheffield, and Glasgow
• Flexible and hybrid working arrangements
• Salary: Competitive and dependent on experience and role requirements
• Job Reference: R-159804

Start Your Engineering Career With AtkinsRéalis

Joining AtkinsRéalis provides an opportunity to contribute to major UK nuclear programmes and develop expertise across complex mechanical engineering projects. The Senior / Principal Mechanical Engineer will work with engineering teams, clients, and multidisciplinary stakeholders to deliver safe, efficient, and high-quality engineering solutions.

The role provides exposure to a wide range of projects, including reactor operations, nuclear new build, Small Modular Reactors, fusion energy, and nuclear decommissioning.

The position may require security clearance. Where applicable, employment will depend on obtaining the required level of clearance, and the vetting process may require evidence of five or more years of UK residency.

Apply Now to become a Senior / Principal Mechanical Engineer – Nuclear with AtkinsRéalis and contribute to major engineering projects across the UK nuclear sector.