Principal Mechanical Engineer

About the role

As a Principal Engineer, you’ll be the lead engineer on projects, working closely with electrical and software engineers, as well as project managers, to ensure smooth and successful delivery of our solutions to clients around the world.

With our equipment being specialist, we provide product familiarisation and training, but experience of linear motion systems, precision rotating components, BS8888 / GD&T, limits and fits, and designing for manufacture is fundamental to the role. Experience of calibration and testing would be an advantage.

Successful applicants will have experience of the project lifecycle, showing an ability to develop requirements, create engineering plans to solve complex engineering problems and deliver optimised solutions.

The role also includes opportunities for testing, prototyping and overseeing the installation and commissioning of our equipment, for which the candidate will require a good hands-on approach.

Whether you re refining your skills or looking to grow into a more senior role, we offer a supportive environment, full training on our specialist systems, and opportunities to travel internationally.

• Taking the lead in undertaking and reviewing engineering calculations and analysis to make decisions and demonstrate system performance
• Participate in, and lead design reviews, recommending design modifications to improve functionality, reliability, and manufacturability
• Provide feedback to improve working practices, processes, and project delivery
• Producing technical reports, specifications, and other technical documentation
• Produce 3D CAD models and drawings for detailed design
• Review and Approve CAD models and drawings for engineers
• Potential for overseas travel for commissioning and validation of our equipment
• Salary from £55 - £65k dependant on experience
• The closing date for applications is 2nd March 2026

• Experience of the project lifecycle with the ability to develop requirements and create engineering plans to solve complex problems
• Experience of linear motion systems, precision rotating components, BS8888 / GD&T, limits and fits, and designing for manufacture
• Experience of calibration and testing would be an advantage
• Hands-on approach to testing, prototyping, installation and commissioning
• Willingness to travel internationally

If you are excited about this role but unsure whether you re the right fit, we encourage you to apply. We re also happy to answer any questions by emailing

Interested? Please apply providing your CV with a covering letter.

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HR Wallingford are an equal opportunity employer and value diversity in our workplace. We do not discriminate, and work to create an inclusive culture across our business.

HR Wallingford is committed to equality, diversity and inclusion.