Principal Mechanical Engineer

Company: Assystem
Apply for the Principal Mechanical Engineer
Location: Helensburgh
Job Description:

Overview

In this role you support the Client Design Authority to safeguard and optimize infrastructure systems within a highly regulated environment. You will shape mechanical design packages, ensure safety and regulatory compliance, and collaborate with cross-functional teams to deliver reliable, cost-effective plant modifications. You’ll work on complex infrastructure challenges, contributing to safe, efficient operations at scale. This is a hands-on position in a world-class nuclear engineering group seeking practical, impact-driven engineers.

Pay / Benefits

  • mindfulness and wellbeing resources
  • confidential support line 24/7
  • discount vouchers for days out and restaurants
  • eye test and glasses vouchers
  • cycle to work scheme
  • free flu jabs

Responsibilities

  • Produce and review infrastructure design packages and specifications
  • Define reliability, performance, and operational requirements for systems
  • Assess maintenance procedures to ensure safe operations
  • Evaluate design, material ageing, and asset suitability for continued operation
  • Promote safety, security, and compliance across activities
  • Act as an intelligent customer ensuring contract and deliverables meet regulatory requirements

Key requirements

  • Broad mechanical engineering experience with pumps, cranes, HVAC, pressure systems, or diesel generators
  • Desirable: experience in nuclear or other highly regulated/high-hazard industries
  • Ability to develop practical, innovative, cost-effective engineering solutions for plant modifications
  • Good understanding of British and international design standards
  • Strong analytical skills and evidence-based decision making
  • Excellent written and verbal communication and stakeholder engagement
  • Well organized with ability to manage priorities and deadlines
  • Excellent written and verbal communication
  • Stakeholder engagement
  • Organizational and time-management skills
  • Pumps
  • Cranes
  • HVAC

…

Posted: September 14th, 2026