Senior Mechanical Engineer

Company: Assystem
Apply for the Senior Mechanical Engineer
Location: Warrington
Job Description:

Senior Mechanical Engineer

Location: Warrington

Type: Staff / Contract (Inside IR35)

Role Description

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

Key responsibilities:

  • Deliver detailed design work packs and supervise designers in the production of layout and detailed design drawings.
  • Support the design through all project phases, testing, and execution of parts required in this current phase.
  • Work closely with the multi-discipline design team and plant-based team.
  • Guide Mechanical Designers and Engineers in the production of detail drawings, sub-assemblies, GA, layout drawings, flow diagrams, and parts lists.
  • Produce calculations to verify detailed design and design substantiation (as required).
  • Produce and compile technical files for machinery/UK CA compliance (e.g., RA’s, O&M manuals, etc.).

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: Applicants must meet certain residency criteria to attain a minimum level of UK security clearance, if not already cleared to a minimum SC level.

NOTICE TO CANDIDATES ON RECRUITMENT FRAUD

We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process.

We are committed to equal treatment of candidates and promote 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.

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Posted: June 6th, 2026