Senior Mechanical Engineer

-; England; On-site; GBP 50,000 - 70,000; Full time

Job summary

A global engineering company in the United Kingdom is seeking a Senior Mechanical Engineer. The successful candidate will manage mechanical design work, ensure compliance with regulations, and support design throughout all project phases. Candidates should have extensive experience in the nuclear industry and demonstrate strong technical skills, including report writing and stakeholder communication. This is a contract role based in Warrington, focusing on delivering critical mechanical designs and documentation.

Qualifications

• Experience working within a highly regulated industry, preferably nuclear.
• Familiarity with 'Design for Assembly' in a nuclear facility.
• Skilled in producing mechanical engineering calculations.

Responsibilities

• Deliver mechanical work scope reporting to a Principal Engineer.
• Produce design work packs and drawings for multi-discipline teams.
• Compile technical files for machinery compliance.

Skills

Understanding of mechanical designs in the nuclear sector

Report writing skills

Liaising with stakeholders

Ability to manage workload

Communication skills

Job description

Company Description

Assystem is an international company with one mission: accelerate the energy transition around the world.

Every day, our 8,000 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low‑carbon energy.

We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition.

Drawing on more than 55 years' experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimise the performance of complex infrastructure projects throughout their life cycle. The Group is currently ranked second in the world for nuclear engineering.

To ensure a viable, efficient, and reliable energy future for all.

Job Description

Senior Mechanical Engineer

Location: Warrington

Type: Staff / Contract (Inside IR35)

Role Description

The Mechanical Senior Engineer is required to deliver the mechanical work scope, including production and checking, reporting to a Principal Engineer.

They will need to deliver detailed design work packs and supervise designers in the production of layout and detailed design drawings.

The project is in the latter stages of preliminary design with mock‑up parts, with certain assemblies in final manufacturing and testing.

The Mechanical Senior Engineer will be required to support the design through all project phases, testing, and execution of the parts required in this current phase.

They will work closely with the multi‑discipline design team and plant‑based team.

The role includes guiding Mechanical Designers and Engineers in the production of detail drawings, sub‑assemblies, GA, layout drawings, flow diagrams, and parts lists.

May be required to produce calculations to verify detailed design and design substantiation.

The production and compilation of technical files for machinery/UK CA compliance (e.g., RA's, O&M manuals, etc.) will also be a requirement.

Qualifications

Essential Experience & Qualifications

• Experience of working within a highly regulated industry, preferably within the nuclear industry.
• Familiarity with 'Design for Assembly' within a nuclear facility.
• Ability to manage own workload and drive the completion of the work scope.
• Strong understanding of delivering mechanical designs in the nuclear sector.
• Experience in producing technical files (UK CA and machinery directive compliance).
• Knowledge of machining and fabrication manufacturing processes.
• Experience in producing and checking mechanical engineering calculations and deliverables.
• Skilled in liaising with key stakeholders and other design disciplines.
• Competent report writing skills for clear and concise findings.
• ⏳ Comfortable working under time and cost constraints.
• Excellent communication skills with team members and the Client.

Additional Information

Security clearance

Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK security clearance if not already security cleared to a minimum SC level.

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people's ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.