Senior Mechanical Design Engineer - Building Services in Northampton

Senior Mechanical Design Engineer – Building Services About the Company My client is a well established consultancy that provides nationwide coverage across both the Private and Public sectors. Their portfolio spans corporate office and warehouse buildings, local authority civic buildings, secondary and primary schools, colleges, leisure centres, universities, large NHS Trust hospitals and police headquarters. With a strong reputation for delivering compliant, efficient and high‑performing building services solutions, the business continues to grow and strengthen its technical team. Role Overview Seeking an experienced Senior Mechanical Design Engineer to play a key role in delivering high‑quality mechanical building services design across a diverse and complex project portfolio. This position offers the opportunity to take ownership of design delivery, lead projects, support client engagement and mentor junior engineers within a collaborative, multidisciplinary environment. Key Responsibilities * Lead the design of mechanical building services including HVAC, heating, cooling, ventilation and public health systems * Produce detailed design calculations, drawings, specifications and technical reports * Manage projects from concept through to completion, ensuring technical accuracy and compliance * Conduct site surveys, feasibility studies and technical assessments across varied building types * Coordinate closely with electrical engineers, architects, structural teams and contractors * Ensure designs meet all relevant regulations, standards and sustainability requirements * Attend client meetings, present design solutions and support technical decision‑making * Provide guidance and mentoring to junior and intermediate engineers * Contribute to continuous improvement, innovation and best practice within the design team Candidate Requirements * Strong experience in mechanical building services design within the UK * Excellent technical understanding of HVAC and public health systems * Proficiency in AutoCAD, Revit, IES or similar design software * Solid knowledge of UK building regulations and CIBSE guidelines * Proven ability to manage projects and deliver high‑quality design solutions * Confident communicator with the ability to engage effectively with clients and stakeholders * Chartered or working towards Chartership (desirable) What the Company Offers * Competitive salary and benefits package * Opportunity to work across a wide range of public and private sector buildings * Clear progression pathways into Principal or Associate level * A supportive, collaborative team environment * Exposure to technically challenging and socially impactful projects If you are interested in the above role we'd love to hear from you