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Senior Principal Mechanical Engineer

Assystemā€¢šŸŒ Remote Worldwide•Estimated: $80,000 - $120,000

✨ AI Insights & Summary

Assystem is seeking a highly experienced leader for their Fusion and Modular Nuclear Business Unit to establish and manage the Cooling Water Island engineering team for a groundbreaking Small Modular Reactor (SMR) program. This pivotal role is an exceptional opportunity for a Chartered Engineer with extensive FEED to Detailed Design experience and strong regulatory knowledge (ONR, Environment Agency, HSE) to shape the future of clean energy. The position offers a hybrid work model, attractive social benefits, ongoing training, and significant internal promotion opportunities within a leading global nuclear engineering firm.

Cooling Water Island Team Lead - Small Modular Reactor (SMR) Program

Company: Assystem
Location: UK (Hybrid, 1-2 days remote per week)

Assystem is a global leader in nuclear engineering, supporting complex infrastructure projects in highly regulated sectors. With 8,000 experts across 13 countries, we intervene across the entire project lifecycle in engineering, project management, and digital solutions.

About the Role

Join the Fusion and Modular Nuclear Business Unit and take on a pivotal role in shaping the future of clean energy. You will establish, lead, and manage the Cooling Water Island engineering team within a groundbreaking Small Modular Reactor (SMR) development program. Drive the development of a high-performing team, overseeing the design, integration, and execution of critical cooling water systems essential to reactor operation.

Your Mission

  • Leadership: Lead and mentor the Cooling Water Team, driving technical excellence, innovation, and collaboration.
  • Requirements Development: Define and establish rigorous safety and performance criteria, ensuring compliance with industry regulations.
  • Design Package Production: Oversee the creation of comprehensive design packages aligned with project specifications and technical standards.
  • Interface Management: Coordinate effectively between engineering teams, suppliers, and stakeholders for seamless system integration.
  • Technical Specification Preparation: Develop clear, detailed technical specifications for key cooling water system components.
  • Equipment & Schedule Management: Track, update, and manage critical equipment inventories and project schedules.
  • Risk & Opportunity Management: Proactively identify and implement strategies to mitigate challenges and optimize project success.

Why Join Assystem?

  • Over 55 years of experience in nuclear engineering.
  • Ranked among the top 3 largest nuclear engineering companies globally.
  • Attractive social benefits, including an engaging Employee Committee and holiday bonuses.
  • Ongoing training with numerous career opportunities.
  • 70% of managers are promoted internally.
  • Hybrid work model: 1-2 days remote per week.

Qualifications

  • Experience:
  • FEED to Detailed Design experience in leading projects.
  • Multi-Disciplinary Team Leadership.
  • Oversight of Steam Cycle Modelling.
  • Project Budget & Lifecycle Planning.
  • Cooling Water Equipment Expertise.
  • Requirements Capture Experience.
  • Systems Engineering Awareness.
  • Subcontractor Management.
  • Knowledge:
  • Regulatory & Compliance Knowledge (ONR, Environment Agency, HSE).
  • Professional Accreditation:
  • Chartered Engineer (CEng) in a relevant discipline.
  • Security:
  • Eligibility to obtain SC clearance.

Attributes

  • Excellent communication skills (written and oral).
  • Strong leadership skills.
  • Focus on delivering quality output to time and budget.
  • Integrity and ability to instil it in others.
  • Appreciation of wider technical issues beyond own discipline.
  • High degree of independence, initiative, and self-motivation.
  • Comfortable working in a multi-party, multi-national environment.
  • Ability to travel to Assystem offices and customer sites within the UK.

Due to the nature of the work, candidates must meet residency criteria for UK security clearance.

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Job Overview

Posted6/11/2026
CategoryFullstack Development
SourceJobsCollider

FAQ

Is this position remote?

The Senior Principal Mechanical Engineer role is a hybrid opportunity. The location specified is Remote Worldwide.

What is the salary?

The salary is not explicitly stated, but is competitive and based on experience.

How do I apply?

You can apply by clicking the "Apply for this role" button above to submit your application on the hiring website.

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