Principal Mechanical Engineer

Manpower UK Ltd; Plymouth; Hybrid; GBP 50,000 - 80,000; Full time

Job summary

A leading global aerospace, Defense, and security company seeks a Principal Mechanical Engineer to guide mechanical building services projects. The role requires expertise in mechanical engineering principles, compliance with regulations, and overseeing subcontractor designs. Join a team dedicated to delivering mission-critical solutions in high-hazard environments with innovative approaches to engineering challenges.

Qualifications

• Excellent understanding of design, operation, and maintenance of mechanical systems.
• Experience in contractor design and leading a small team.
• Detailed knowledge of regulations and technical standards.

Responsibilities

• Lead Mechanical Building Services projects and ensure quality compliance.
• Conduct technical audits and design validations.
• Provide guidance and oversight to junior engineers.

Skills

Mechanical engineering principles

Design lifecycle

Knowledge of BREEAM

Project management

Energy reduction methods

Tools

Digital tools for engineering

Job description

Role: Principal Mechanical Engineer

Location: Plymouth(Hybrid)

Duration: 12 months

Inside IR35: Umbrella

About our client:

Our client is a leading global aerospace, Defense, and security company specializing in delivering complex, mission-critical solutions. With a strong heritage in engineering and innovation, they provide essential services across aviation, marine, land, and nuclear sectors, supporting governments, armed forces, and commercial clients worldwide. Renowned for their commitment to safety, sustainability, and technological advancement, our client plays a vital role in ensuring operational excellence for their customers. Join them and be part of a team that drives innovation and delivers cutting-edge solutions in some of the world's most demanding environments.

The primary purpose of the Senior Mechanical Building Services Engineer role is to lead Mechanical Building Services projects delivered by subcontractors.

This role ensures that outsourced designs meet technical, regulatory, and business requirements while maintaining the highest standards of quality and compliance. The successful candidate will act as the technical authority, bridging the gap between the company's engineering requirements and subcontractor performance.

The key responsibilities of the role include:

• Prescribe the Mechanical Building Services requirements for design projects.
• Specify Mechanical Building Services aspects in Scope of Work Documentation.
• Produce estimates and assist commercial departments in the production of outgoing tender responses.
• Support tender reviews from a technical perspective.
• Represent our client at meetings with stakeholders and contractors.
• Provide technical oversight of Mechanical Building Services designs through frequent reviews and progress meetings.
• Support Design Reviews to ensure that subcontractor designs align with company requirements, industry standards, and regulatory compliance.
• Design Validation. Conduct independent assessments, technical audits, and feasibility reviews to verify design integrity and functionality.
• Lead author of design documentation
• Responding to subcontractor Technical Queries.
• Represent the Mechanical Services Technical Authority by leading on-site visits and where appropriate, providing guidance and leadership to staff.
• Conduct site surveys, inspections, and monitor site works.
• Lead the provision of advice to line management and other key stakeholders, on the implementation and maintenance of design documentation and compliance with relevant codes, standards and legislation.
• Provide technical oversight to junior engineers.
• Maintaining complete records and archives to company standards.

Required:

• Excellent understanding of mechanical engineering principles for the design, operation and maintenance of Steam & Condensate, Industrial Gases, Fresh Water, Demineralised Water, HVAC, Domestic Water services etc.
• Knowledge and experience of BREEAM, DREAM, Building Regs
• Experience of working in a design consultancy and/or experience of working within a contractor design environment. Knowledge / experience in managing a small team of engineers.
• Good level of computer literacy in a range of digital tools.
• Knowledge of the design lifecycle
• Detailed knowledge of appropriate, regulations, legislation and technical standards that are applicable to mechanical services system design.
• Knowledge of operating within nuclear or other high-hazard Industries.
• Familiar with energy reduction methods and approaches to decarbonising new and existing buildings. Including principles of building physics such as passive design solutions.
• Experience of commissioning and post installation evaluation of performance.

Please apply if you want to be part of a leading global defence, and security company that delivers complex, mission-critical solutions