Principal Mechanical Engineer – Nuclear/Defence, Hybrid

Mott MacDonald; Altrincham; Hybrid; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Private medical insurance

Pension with employer contributions

Employee ownership

Job summary

Mott MacDonald is seeking a Principal Mechanical Engineer to join our Nuclear, Defence and Civil division. You will lead multidisciplinary teams, drive mechanical design from feasibility to detailed design, and ensure safety, quality, and regulatory compliance across complex projects.

You will mentor engineers, deliver high-quality documentation, and interact with clients to develop robust technical solutions and successful outcomes.

Qualifications

• Degree in Mechanical Engineering or relevant field with professional registration progress towards chartership.
• Experience delivering mechanical engineering design within highly regulated environments (nuclear/defence).
• Proven ability to lead technical work, deliver quality outputs and provide technical leadership to engineers.

Responsibilities

• Take a leading technical role across projects from feasibility to detailed design.
• Develop and deliver mechanical designs and solutions for complex projects and ensure safety and quality requirements.
• Provide technical assurance through reviews and approvals of engineering outputs.

Skills

Mechanical engineering

Nuclear industry experience

Leadership

Technical assurance

Client-facing

Multidisciplinary teams

Regulatory compliance

Design lifecycle

Education

Degree in Mechanical Engineering

Chartered engineer or progress towards chartership

Job description

Mott MacDonald is seeking a Principal Mechanical Engineer to join our Nuclear, Defence and Civil division. You will lead multidisciplinary teams, drive mechanical design from feasibility to detailed design, and ensure safety, quality, and regulatory compliance across complex projects.

You will mentor engineers, deliver high-quality documentation, and interact with clients to develop robust technical solutions and successful outcomes.