Principal Mechanical Design Engineer - Building Services (Critical Systems) Location: Chester (Hybrid Working)Salary: 60,000 - 70,000 per annumJob Type: Permanent An excellent opportunity has arisen for an experienced Principal Mechanical Design Engineer to join a leading building services consultancy working within a specialist critical systems team.This role offers the chance to lead the delivery of technically complex mechanical building services projects, with a strong focus on Stage 4 detailed design and high-performance engineering solutions.The successful Principal Mechanical Design Engineer will play a key role in technical leadership, project delivery and team coordination, contributing to innovative and high-quality building services designs across critical environments. Key ResponsibilitiesAs a Principal Mechanical Design Engineer, your responsibilities will include:Leading the delivery of mechanical building services design projectsProducing and reviewing Stage 4 detailed design documentationDeveloping HVAC system designs, calculations and technical specificationsProviding technical leadership across project teams and design deliveryCollaborating with electrical engineers, structural engineers and architectsSupporting BIM coordination and multidisciplinary design integrationEnsuring designs meet industry standards, regulations and client requirementsManaging project delivery in line with programme, budget and quality targetsMentoring and supporting junior and inte