Apply fast, check the full description by scrolling below to find out the full requirements for this role. Are you a senior mechanical engineer ready to shape the next generation of mission-critical infrastructure across the UK - while influencing global engineering standards? At Black & White Engineering, you’ll join a high-performing team delivering advanced mechanical engineering solutions for hyperscale and colocation data centres across the UK. This role positions you at the forefront of designing resilient, energy-efficient and technologically advanced facilities that power the UK’s growing digital economy - supporting AI platforms, cloud providers, high-density compute and large-scale digital operations. As a Principal Mechanical Engineer, you’ll not only lead major UK projects, but also play a key role within our Global Engineering Team (GET) - the group responsible for driving technical excellence, global best practice, QA/QC governance and engineering standardisation across all regions. If you thrive in a fast-paced, engineering-led, quality-driven environment where your decisions shape both national and global delivery, this is your opportunity. Your Future With Us Leadership on Mission-Critical Projects - Lead the mechanical design of large-scale data centres across the UK - from feasibility and concept through RIBA stages, detailed design, construction and commissioning. You’ll influence cooling performance, resilience, energy efficiency and long-term operational outcomes for globally recognised clients. Global QA/QC Leadership - As part of the Global Engineering Team (GET), you will: Drive consistent engineering standards across a variety of regions. Lead technical reviews and global QA/QC processes. Support governance, peer review frameworks and technical approval gateways. Ensure mechanical designs across international teams meet Black & White’s global quality benchmarks. Your input will directly shape our worldwide design methodology, templates, tools and engineering excellence initiatives. Strategic Client Partnership - Engage with major UK and international clients, providing senior-level mechanical expertise, design assurance and strategic engineering direction. You’ll solve complex cooling, energy and operational challenges with clarity and confidence, becoming a trusted advisor for mission-critical development. Technical Depth & Innovation - Oversee detailed mechanical design including HVAC, chilled-water systems, heat-rejection solutions, air handling, equipment selection, plant room layouts and high-density cooling systems. You will ensure all designs meet UK Building Regulations, CIBSE guidance, BS/EN standards and evolving sustainability commitments. Cross-Disciplinary Collaboration - Work closely with electrical, civil, structural, sustainability, design management, commissioning and BIM teams to deliver fully integrated engineering solutions that meet stringent performance and compliance requirements. Talent Development & Team Leadership - Mentor engineers, lead technical development initiatives and support career progression across the mechanical discipline. As part of GET, you may contribute to global training, knowledge sharing and engineering capability development. Business Influence & UK Growth - Support strategic growth across the UK - strengthening client relationships, supporting bids, promoting technical capability and helping position Black & White as a leading mission-critical engineering partner. Essential Skills Extensive UK experience in mechanical building-services engineering, ideally across data centres or other mission-critical sectors. Deep technical knowledge of HVAC, chilled-water systems, heat rejection, high-density cooling, air distribution and mechanical plant design. Excellent understanding of UK Building Regulations, CIBSE documentation, BS/EN standards, TM65/TM54 and sustainability frameworks. Proficiency with mechanical design tools including AutoCAD, Revit, IES, Hevacomp and CFD modelling. Strong background leading major projects and coordinating multidisciplinary teams. Experience contributing to or leading QA/QC, peer reviews or engineering governance is highly advantageous. Strong communication skills with confidence representing the mechanical discipline commercially and technically. Chartered status (CEng, MCIBSE/IMechE) or actively working toward professional accreditation. Company Overview Black & White Engineering is a multi-award-winning engineering consultancy with offices across the UK, Europe, the Middle East and Asia Pacific. We are a leading provider of engineering design services for the data centre sector, delivering expertise across Mechanical, Electrical and Plumbing (MEP), Civil and Structural, Power Systems, Sustainability, BIM, Design Management and wider specialist infrastructure disciplines. Our teams support projects across all areas of the construction industry, offering practical, efficient design solutions that prioritise real-world installation, maintenance and operational performance. As one of the fastest-growing consultancies in our industry, we offer genuine opportunities for progression - many of our engineers have developed into leadership roles as the business has expanded. xehkeey Joining Black & White means making a meaningful impact with clients and colleagues, while receiving the recognition you deserve.