Your new company We are recruiting on behalf of a leading organisation within the commercial decarbonisation and offsite energy solutions sector. With operations spanning the UK, Ireland, and Europe, they are well established in designing and delivering innovative low‑carbon and prefabricated mechanical and energy systems. Their Birmingham (Solihull) office is home to a growing multidisciplinary design function, responsible for creating coordinated, build‑ready solutions that support the transition towards sustainable, low‑carbon technologies. Your new role As the new Principal Mechanical Design Engineer, you will take a senior position within the Design Team, leading mechanical design output across a variety of commercial decarbonisation projects. You'll manage designs from early concept development through to commissioning support, ensuring technical accuracy and seamless integration with fabrication, BIM, project management, and commissioning teams.You will also play a key part in mentoring junior engineers and contributing to best‑practice standards across the department.Core responsibilities include: Leading mechanical design delivery across multiple commercial projects Producing schematics, engineering calculations, plant selections, bills of materials and specifications Developing and validating BMS/control strategies from design through to on‑site implementation Supporting coordinated design development with internal and external stakeholders This is a full‑time role working Monday-Thursday 8am-5pm and Friday 8am-3pm, reporting directly to the Head of Design. What you'll need to succeed To excel in this role, you should have: Significant experience in mechanical design engineering, ideally within building services, energy systems, or decarbonisation solutions Strong technical understanding of mechanical systems, low‑carbon technologies, and prefabricated/offsite design approaches Proficiency in producing detailed mechanical calculations and technical documentation Experience developing BMS or control strategy designs The ability to lead design delivery while supporting and guiding junior engineers Strong communication skills and the ability to work effectively with multidisciplinary teams What you'll get in return A salary of up to £65,000, depending on experience The opportunity to join a forward‑thinking organisation at the forefront of sustainable and offsite energy solutions Access to state‑of‑the‑art design and fabrication facilities across the wider business A role with real technical influence and the chance to shape best practice across the team Professional development opportunities within a growing design function A supportive and collaborative engineering environment committed to innovation and decarbonisation What you need to do now If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now. If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career. Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk