Job Title: Principal Mechanical Design Engineer Location: Southampton Job Type: Permanent Hybrid Working: 3 days in office / 2 days from home Start Date: Flexible Salary: £65,000 - 75,000 Overview An exciting opportunity is available for a Principal Mechanical Design Engineer (or experienced Associate-level Mechanical Engineer) to join a dynamic Building Services team in Southampton. This role will focus on delivering highly technical projects, with a particular specialism in healthcare and cleanroom environments. Engineers from a varied project background are encouraged to apply, provided they have strong technical design capability within Building Services. Key Responsibilities Lead mechanical design delivery across complex building services projects Take technical ownership of healthcare and cleanroom schemes Produce and review detailed mechanical calculations and specifications Oversee HVAC, ventilation, heating and cooling system designs Coordinate with multidisciplinary teams, including electrical and public health engineers Engage with clients and stakeholders where required Mentor and support junior engineers Contribute to project planning and technical strategy Project Focus Healthcare facilities Cleanroom environments Technically demanding building services projects Broader sector experience also welcomed Requirements Proven experience at Principal or Associate Mechanical Engineer level Strong Building Services design background Experience delivering technically complex projects Knowledge of healthcare or cleanroom design principles is desirable Excellent technical and coordination skills Strong communication and leadership capability What This Role Offers Hybrid working model (3 days office / 2 days remote) Opportunity to specialise in high-specification technical sectors Leadership responsibility within a supportive engineering team Long-term career progression within a growing environment If you are a senior Mechanical Design Engineer seeking a technically challenging role with hybrid flexibility in Southampton, this is a priority opportunity to explore.