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Posted 05 August, 2026

Mechanical Design Engineer

O'Connor Sutton Cronin
City of London, ENG, GB Full Time

Job Description

Mechanical Design Engineer (Intermediate & Senior)

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OCSC, a multi-disciplinary engineering consultancy is seeking Intermediate and Senior Mechanical Design Engineers to join its Building Services team.

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Location: London or Birmingham (Hybrid working model)

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Sponsorship: Not available

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Role

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As part of an integrated multidisciplinary project team, you will be responsible for the design and specification of mechanical building services systems for a wide range of projects. Opportunities are available at both Intermediate and Senior level, with responsibilities aligned to your experience

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Requirements

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Intermediate Mechanical Design Engineer

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  • Third level degree in Mechanical or Building Services Engineering.
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  • Minimum 3 years' experience in a similar building services design role.
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  • Previous UK or Ireland project experience is essential.
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  • Strong technical ability and understanding of current engineering standards, including Building Regulations, CIBSE/BSRIA Guides and IS/EN Standards.
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  • Experience in the design and specification of mechanical building services systems, including drainage, water services, heating, cooling, ventilation and controls.
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  • Experience with Bluebeam, AutoCAD and Navisworks.
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  • Good communication skills and the ability to work effectively within a multidisciplinary engineering team.
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  • Excellent attention to detail and accuracy.
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Senior Mechanical Design Engineer

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  • Third level degree in Mechanical or Building Services Engineering.
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  • 7+ years' experience in mechanical building services design, ideally within a design consultancy.
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  • Previous UK or Ireland project experience.
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  • Strong technical ability and thorough understanding of current engineering standards, including Building Regulations, CIBSE Codes and IS/EN Standards.
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  • Extensive experience in the design and specification of mechanical building services systems, including drainage, water services, heating, cooling, ventilation and Building Management Systems (BMS).
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  • Experience working with clients, contractors and vendors.
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  • Experience with AutoCAD; Revit and IES experience advantageous.
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  • Chartered Engineer status or working towards chartership.
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  • Strong leadership, communication and project management skills.
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  • Excellent attention to detail and accuracy.
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Key Responsibilities

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Intermediate

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  • Assist with the design and specification of mechanical building services systems in accordance with current regulations and design standards.
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  • Work as part of an integrated project design team.
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  • Assist with the management of engineering tasks on projects.
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  • Support construction-stage activities, including site inspections, technical submittals and responding to RFIs.
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Senior

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  • Lead the design and specification of mechanical engineering solutions for building projects.
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  • Work directly with clients to define project requirements and develop technical solutions.
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  • Lead multidisciplinary project design teams.
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  • Manage pre-construction engineering activities, including services coordination, tender documentation, specifications and equipment schedules.
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  • Lead project delivery during construction, including site inspections, technical submittals and RFIs.
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  • Mentor and support junior engineers.
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Benefits

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  • Competitive salary (plus bonus for Senior level)
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  • Hybrid and flexible working
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  • Pension scheme
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  • Life Insurance (Death in Service)
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  • Sponsored education / Educational Assistance Scheme
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  • Continuing Professional Development (CPD) Programme
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  • Professional fees paid
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  • Wellness Programme
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