Mechanical Engineer – Nuclear

Snc-Lavalin; United Kingdom; Hybrid; GBP 60,000 - 90,000; Full time

Benefits offered by this job

Competitive salaries and a broad range

Training and professional development

Hybrid working culture

Job summary

AtkinsRéalis is seeking an experienced Mechanical Engineer to lead design and substantiation of mechanical equipment for UK nuclear projects. You will work across reactor operations and collaborate with our delivery teams to ensure safety, quality and efficiency across lifecycle stages.

You will liaise with clients and internal teams, manage complex briefs, and contribute to bids, budgets and schedules while maintaining strong stakeholder relationships to drive successful outcomes.

Qualifications

• Experience leading mechanical design and substantiation for complex projects.
• Ability to liaise with clients and internal teams to understand needs.
• Familiarity with nuclear systems and safety standards.

Responsibilities

• Lead design and substantiation of mechanical equipment to safety, quality, and efficiency standards.
• Coordinate with Power New Build and Decommissioning teams.
• Engage with stakeholders at all levels to align goals and timelines.
• Support bids, budgets, schedules, and detailed design phases.

Skills

Mechanical design

Design substantiation

Stakeholder liaison

Job description

Job Description Overview

Are you an experienced Mechanical Engineer who is passionate about making the world a better place? Would you be excited to play a part in supporting the fight against climate change? Do you thrive in collaborative, creative environments? Are you looking for a challenging role that allows flexible working and work‑life balance? If this sounds like you, then we'd love to hear from you.

We are looking for Mechanical Engineers to expand and grow our Derby office to meet increasing client demand in the region. As a member of our team, you will work on a diverse and challenging range of complex projects for our clients, with opportunities to work within AtkinsRéalis design teams or directly with our clients by being embedded into their major programmes. Whether you possess a breadth of experience from working across different markets or industries, or you already have a depth of experience working in Nuclear, we have the pipeline of opportunities to ignite your career and take your skills and experience to the next level. The variety and scale of projects we work on means that there is something for everybody, and we work hard to make sure that all of our staff have fulfilling and rewarding careers. Whatever our individual roles, we approach everything we do with a sense of curiosity, care, courage and community. You will have the opportunity to apply your existing skills and develop new skills across a wide range projects across the full UK nuclear industry.

In Reactor Operations, your core work will involve leading the design and substantiation of mechanical equipment to the highest standards of safety, quality, and efficiency, to enable the continued operation and life extension of our UK fleet of nuclear power stations and nuclear‑powered submarines. Our team also work closely with our Power New Build business, supporting Hinkley Point C, Sizewell C, and the development of Small Modular Reactors and Fusion Energy reactors, as well as our Decommissioning business, supporting the safe dismantling, processing and packaging of nuclear waste at the UK’s nuclear estate at Sellafield and across the UK’s decommissioning power stations and nuclear‑powered submarines.

Your role
Whether you work in our offices or at client sites, you will be part of a team delivering a wide range of complex and exciting mechanical engineering and multi‑disciplinary projects. Whether it’s managing timescales, solving problems, or providing guidance to junior engineers, you’ll bring energy and focus – helping the team stay calm, connected and focused on delivering outstanding outcomes for our clients. You will enjoy drawing upon your strengths to deliver design and substantiation projects at all stages of the lifecycle, from providing technical input to bids, budgets and schedules, working with clients to explore feasibility and optioneer engineering solutions, to detailed design and construction. You will be able to confidently liaise with, present to, and influence stakeholders at all levels both internally and externally, in understanding their issues, goals, and processes and to build strong, lasting relationships.

About you
You are someone who brings calm to complexity. You enjoy working in fast‑paced environments and get a real sense of satisfaction from helping people stay organised and focused. You’re naturally collaborative – someone who builds strong relationships and keeps communication flowing. You’re comfortable juggling priorities, solving problems as they arise, and keeping things moving. You’ve worked with a range of engineering tools to design and substantiate mechanical equipment such as mechanical handling systems, machinery, test rigs, or mechanical components. You will understand how to deliver complex engineering projects through a structured design process, ensuring we deliver right‑first‑time solutions to our clients to time, cost and quality.

Rewards & benefits

Explore the rewards and benefits that help you thrive – at every stage of your life and your career.

• Enjoy competitive salaries, employee rewards and a brilliant range of benefits you can tailor to suit your own health, wellbeing, financial and lifestyle choices.
• Make the most of a myriad of opportunities for training and professional development to grow your skills and expertise.
• And combine our hybrid working culture and flexible holiday allowances to balance a great job and fulfilling personal life.

Rewards and benefits – Careers at AtkinsRéalis

About AtkinsRéalis

We’re AtkinsRéalis, a world‑class engineering services and nuclear organization. We connect people, data and technology to transform the world’s infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project managers, we can change the world. We’re committed to leading our clients across our various end markets to engineer a better future for our planet and its people. Find out more.

Additional information

Security clearance This role may require security clearance and offers of employment will be dependent on obtaining the relevant level of clearance. If this is necessary, it will be discussed with you at interview. The vetting process is delivered by United Kingdom Security Vetting (UKSV) and may require candidates to provide proof of residency in the UK of 5 years or longer. If applying to this role please do not make reference to (in conversation) or include in your application or CV, details of any current or previously held security clearance.

We are committed to creating a culture where everyone feels that they belong - a place where we can all be ourselves, thrive and develop to be the best we can be.

As an Equal Opportunities Employer, we value applications from all backgrounds, cultures and ability.

As a Disability Confident Leader, we are committed to offering an interview to all applicants who have a disability and meet the essential criteria.

Worker Type Employee Job Type Regular At AtkinsRéalis, we seek to hire individuals with diverse characteristics, backgrounds and perspectives. We strongly believe that world‑class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion or disability, but enriches itself through these differences. Created by the integration of long‑standing organizations dating back to 1911, AtkinsRéalis is a world‑class engineering services and nuclear company dedicated to engineering a better future for our planet and its people. We create sustainable solutions that connect people, data and technology to transform the world’s infrastructure and energy systems. We deploy global capabilities locally to our clients and deliver unique end‑to‑end services across the whole life cycle of an asset including consulting, advisory & environmental services, intelligent networks & cybersecurity, design & engineering, procurement, project & construction management, operations & maintenance, decommissioning and capital. The breadth and depth of our capabilities are delivered to clients in strategic sectors such as Engineering Services, Nuclear and Capital.

News and information are available at Atkinsrealis or follow us on LinkedIn.