Principal mechanical design engineer - derby

Your newpany

You’ll be joining a well‑established building services consultancy recognised for delivering technically strong, sustainable and low‑carbon engineering solutions. The Derby office supports a wide mix of projects acrossmercial, residential, healthcare, education, industrial and public sector schemes. This is a collaborative, people‑focused environment where senior leaders are encouraged to influence strategy, mentor others and shape the future development of the team.

Your new role

As a Principal Mechanical Design Engineer, you will take a leading role in guiding project delivery, raising technical standards and representing the consultancy at a senior level. You will oversee mechanical design work from early concept through topletion, ensuring accuracy, coordination and robust engineering oues across multiple projects.You’ll act as a trusted contact for key clients, chair and contribute to design meetings, and support the growth and development of junior and intermediate engineers. Your work will include reviewing and producing calculations, drawings and specifications, setting design strategies, selecting appropriate plant and technologies, and ensuring low‑carbon and sustainable principles are embedded in every solution.The role also involves attending site inspections, supporting quality assurance, helping to secure repeat business through strong client relationships, and playing a central role in the ongoing technical development of the mechanical team.

What you'll need to succeed

A degree, HNC or HND in Mechanical or Building Services Engineering

Strong experience in mechanical building services design at a senior or principal level

Proficiency in design software such as Revit, Amtech, Relux/Dialux and Microsoft Office

Strong understanding of British Standards, Building Regulations and industry best practice

Proven ability to engage with clients, lead meetings and influence design direction

Experience integrating low‑carbon, renewable and energy‑efficient systems

Awareness of BREEAM and broader sustainability frameworks

Understanding of electrical interfaces to support multidisciplinary coordination

Professional membership (, CIBSE or IMechE) or active progression toward Chartership

Confidentmunicator with leadership skills and a collaborative approach

What you'll get in return

Salary between £55,000 and £65,000, dependent on experience and seniority

Structured progression pathways and strong CPD/Chartership support

Agile and flexible working arrangements

Generous holiday entitlement with opportunities to buy or sell leave

Enhanced sickness, maternity, paternity and family‑friendly policies

Exposure toplex, interesting and sustainability‑focused project work

Cycle‑to‑work and electric vehicle schemes

Eye care support, Employee Assistance Programme and funded team‑building activities

Referral bonuses and broader staff benefits

Opportunities to take part in charitable, social andmunity initiatives