Job Title: Principal Design Engineer – MechanicalLocation: Oxford, Huntingdon or DerbySalary: Up to £65,000 (Negotiable)Shift Type: Full Time – 36.25 hours per week (Agile Working)Benefits: Enhanced annual leave (buy/sell), enhanced family pay, EAP, EV scheme, cycle to work, referral bonus, structured career progressionThe Opportunity A leading Building Services consultancy is seeking a Principal Design Engineer – Mechanical to join its growing team across Oxford, Huntingdon or Derby. This organisation delivers technically complex and sustainability-led projects across healthcare, education, residential, commercial, pharmaceutical, industrial and public sector schemes. With a strong focus on net-zero carbon and innovative design methodologies, the business has established itself as a respected name within the built environment sector.The Role As Principal Mechanical Engineer, you will play a key leadership role within the team, taking ownership of mechanical design delivery while mentoring junior engineers and supporting client development.Key responsibilities include:

• Acting as Project Leader on selected schemes

• Leading mechanical design from concept through to completion

• Producing and reviewing calculations, drawings and specifications

• Attending principal meetings and delivering client presentations

• Promoting technical excellence within the mechanical discipline

• Supporting repeat business through strong client relationships

• Contributing to multidisciplinary collaboration across projects

• This is a client-facing position offering autonomy, progression and exposure to a broad project portfolio.

We are seeking an experienced Mechanical Building Services Engineer with:

• Degree in Mechanical or Building Services Engineering (Chartered or working towards preferred)

• Minimum 3–4 years’ post-qualification design experience

• Strong understanding of British & European Standards and Building Regulations

• Experience with Relux/Dialux, Amtech, Revit and Microsoft suite

• Knowledge of renewable technologies and BREEAM principles

• Understanding of embedded generation integration

• Professional membership with Chartered Institution of Building Services Engineers or Institution of Engineering and Technology

• Appreciation of electrical engineering for multidisciplinary meetings

• Knowledge of HTMs would be advantageous.

Why Apply?

• Clear pathway to senior leadership

• Exposure to technically challenging, sustainability-led projects

• Agile working framework

• Supportive and collaborative team culture

• Strong investment in professional development

Pertemps Engineering Division is a specialist recruiter within the Engineering sector. For a confidential discussion about this opportunity or other engineering roles, please get in touch.