Senior Mechanical Engineer – Nuclear Infrastructure (Hybrid)

Assystem; Helensburgh; Hybrid; GBP 45,000 - 65,000; Full time

Job summary

Assystem in the United Kingdom is seeking an experienced Mechanical Engineer to support the Client Design Authority, focusing on mechanical design and reliable infrastructure systems. You will produce and review design packages, define performance and safety requirements, and support compliant operations.

The role is primarily remote with 1–2 days per month at the client site in Helensburgh, offering exposure to nuclear-grade projects and opportunities to work across a multi-disciplinary team

Qualifications

• Broad mechanical engineering experience with knowledge of pumps, cranes, HVAC, pressure systems, or diesel generators.
• Experience in the nuclear sector or another highly regulated/high-hazard industry is desirable but not essential.
• Ability to develop practical, innovative, and cost-effective engineering solutions for plant and infrastructure modifications.
• Good understanding of British and international engineering design standards.
• Strong analytical skills with evidence-based decision making using technical data.
• Excellent written and verbal communication skills with stakeholders.
• Well organised with the ability to manage priorities and deadlines.
• Essential: HNC (or equivalent) in a relevant engineering discipline.
• Essential: Strong understanding of design intent for mechanical infrastructure in a regulated industry.
• Desirable: IEng status or equivalent experience.
• Desirable: Degree in Mechanical Engineering or related discipline.

Responsibilities

• Produce and review high-quality infrastructure design packages and technical specifications.
• Define reliability, performance, and operational requirements for infrastructure systems.
• Assess maintenance and work control procedures to support safe operations.
• Evaluate design, material condition, ageing mechanisms, and asset suitability to support operation.
• Promote safety, security, and compliance culture across activities.
• Act as an intelligent customer ensuring safety-related contracts and deliverables meet requirements.

Skills

Mechanical design

Pumps

HVAC

Diesel generators

Regulatory standards

Stakeholder engagement

Education

HNC in engineering

IEng status

BEng/MEng in Mechanical Engineering

Job description

Assystem in the United Kingdom is seeking an experienced Mechanical Engineer to support the Client Design Authority, focusing on mechanical design and reliable infrastructure systems. You will produce and review design packages, define performance and safety requirements, and support compliant operations.

The role is primarily remote with 1–2 days per month at the client site in Helensburgh, offering exposure to nuclear-grade projects and opportunities to work across a multi-disciplinary team