Senior Mechanical Engineer / Principal Mechanical Engineer

Highfield Professional Solutions Ltd; Ullock; Hybrid; GBP 100,000 - 125,000; Full time

Job summary

A major engineering consultancy is seeking a Senior / Principal Mechanical Engineer for a long-term opportunity in the UK. The role offers competitive pay of £51-£61 per hour and involves delivering mechanical engineering tasks for significant nuclear projects. Candidates should have relevant experience in highly regulated industries and a strong technical background. This position offers hybrid working and the chance to influence key design decisions while mentoring junior engineers.

Benefits

Competitive hourly rate

Long-term opportunity

Hybrid working arrangement

Influence design decisions

Qualifications

• At least 5 years of experience in a similar role.
• Ability to lead and mentor junior engineers.
• Experience with engineering compliance and standards.

Responsibilities

• Deliver and manage mechanical engineering tasks across projects.
• Develop, review, and approve designs and technical documentation.
• Ensure compliance with engineering standards and safety requirements.
• Support design reviews and risk assessments.
• Collaborate with multi-disciplinary teams for project delivery.

Skills

Proven experience as Senior or Principal Mechanical Engineer

Background in nuclear or regulated industries

Strong technical capability across mechanical systems

Experience delivering engineering packages

Familiarity with Sellafield design standards

SC clearance or ability to obtain

Job description

Overview

Contract Opportunity: Senior / Principal Mechanical Engineer

Sellafield MSSS-OBLM Projects

£51-£61 per hour (Inside IR35)

Hybrid - 3 days per week in Warrington

Sector: Nuclear | MSSS-OBLM Programme

Responsibilities

• Deliver and manage mechanical engineering tasks across MSSS-OBLM project scopes
• Develop, review and approve designs, calculations, specifications, and technical documentation
• Ensure compliance with Sellafield engineering standards, nuclear safety requirements, and site licence conditions
• Support design reviews, optioneering studies, risk assessments, and HAZOPs
• Provide technical leadership, mentoring and assurance to junior engineers
• Collaborate closely with multi-disciplinary teams to achieve safe, efficient project delivery

What We're Looking For

• Proven experience operating at Senior or Principal Mechanical Engineer level
• Background in nuclear or similarly highly regulated industries
• Strong technical capability across mechanical systems, structures, and process equipment
• Experience delivering task-based engineering packages to programme, cost and quality requirements
• Familiarity with Sellafield MSSS / OBLM design processes and standards (highly advantageous)
• SC clearance preferred or the ability to obtain

Why This Role?

• Competitive £51-£61/hour (Inside IR35)
• Long-term opportunity on a high-profile Sellafield MSSS-OBLM programme
• Hybrid working with 3 days per week in Warrington
• Technically complex, safety-critical work with real national importance
• Opportunity to influence design decisions and support the next generation of engineers

Apply now to bring your mechanical engineering expertise to one of Sellafield's most significant legacy infrastructure programmes