Principal Mechanical Design Engineer (Hybrid)

Marstep Resourcing SolutionsWallingfordreedpublished 10/18/2026
Must-have:SeniorPrincipalHybrid

About the company

An outstanding opportunity has arisen for a Principal Mechanical Design Engineer to join a highly skilled engineering team as a recognised technical authority. This senior role offers hybrid working, a highly enhanced benefits package, and a clear, structured career development pathway with full accreditation support.

Your tasks

As a Principal Mechanical Design Engineer, you will act as a technical authority, providing expert engineering leadership, governance and strategic direction across multiple projects.

Key responsibilities include

  • Acting as the technical authority within areas of recognised expertise
  • Leading the development, review and approval of complex engineering designs, analyses, specifications and technical documentation
  • Providing expert technical guidance and support throughout the engineering lifecycle
  • Leading and participating in technical, design and gate reviews
  • Ensuring compliance with legislation, standards, codes of practice and company procedures
  • Identifying, assessing and managing technical risks, implementing mitigation measures
  • Supporting project planning, estimation and decision-making with specialist knowledge
  • Developing, maintaining and promoting engineering standards and best practice
  • Mentoring and developing engineers, supporting competency growth and knowledge transfer
  • Engaging with clients, suppliers, contractors and internal stakeholders on complex technical matters
  • Supporting business development, bidding and strategic initiatives
  • Acting as an escalation point for significant technical issues and providing recommendations for resolution

Requirements

If you’re an experienced engineer who thrives on technical leadership, complex problem-solving and shaping engineering excellence, this role provides the platform to make a significant impact.

  • Degree or Master’s in Mechanical Engineering - Will consider HND or equivalent with a proven track record in the design, development and delivery of complex mechanical systems.
  • Extensive 3D CAD experience (ideally Creo or SolidWorks), including generating, reviewing and approving designs
  • Significant experience in GD&T, limits & fits, and design for manufacture
  • Strong knowledge of mechanical engineering principles (mechanics, dynamics, materials)
  • Extensive experience with electric motors, rotating machinery, actuation systems, bearings and seals
  • Experience leading technical decision-making and providing specialist guidance
  • Experience reviewing and approving engineering designs, calculations and documentation
  • Chartered Engineer status or working towards professional registration
  • Technically inquisitive, innovative and solutions-focused
  • Strong analytical and problem-solving capability
  • Able to work independently and exercise sound engineering judgement
  • Strong communication skills with the ability to convey complex technical information
  • Practical, hands-on approach
  • Flexible and adaptable across multiple projects
  • Committed to mentoring and developing engineers

Desirable

  • Experience designing for submerged environments
  • Hands-on experience during fabrication, construction or commissioning phases

What we offer

Benefits & Development This senior role offers an exceptional benefits package designed to support your long-term career and wellbeing:

  • Highly enhanced pension scheme
  • Structured career development programme with clear progression routes
  • Accreditation support for professional registration
  • Training & development investment
  • Twice-yearly salary reviews
  • Life assurance & health assurance
  • Hybrid working
  • Optional project-related travel

Up to £65,000, depending on experience.

How to apply

If you’re an experienced Principal Mechanical Design Engineer looking for a role with genuine influence, technical leadership and long-term progression, we’d love to hear from you.

Other

Principal Mechanical Design Engineer Hybrid | Salary up to £65,000,Excellent Benefits + Structured Career Development Programme*