Senior Mechanical SME (m/f/d) in Hemel Hempstead

Make an impact at NTT Global Data Centers Join NTT Global Data Centers and be part of a team that drives innovation and sustainability in the digital world. With over 150 data centers across more than 20 countries globally, we offer unparalleled opportunities to work on cutting‑edge technology and transformative projects. Experience a collaborative, innovative, and inclusive workplace where your ideas are valued, and your growth is supported.

Your role at a glance

As our Senior Mechanical Engineer, EMEA Design Execution SME, is a key member of our EMEA Engineering & Design Execution team, responsible for delivering the localisation of our Design Product, including the defined Owners Project Requirements (OPR) and the Global Reference Design (GRD), through all stages of project execution, including design, permitting, construction, and handover to operations. You will work closely with the Design Manager to guide and support Architects & Engineers (AEs), Owner Furnished Contractor Installed (OFCI) Vendors, General Contractors (GCs), and their supply chains in making technical decisions that deliver our desired business outcomes. You will collaborate with internal stakeholders across parallel business functions, including the Product team, Global Standards team, Ops Central Engineering, Construction, Global Solutions Engineering, Customer Delivery Managers, and Sales. Acting as an intelligent customer, you will help drive the resolution of technical issues and support decision‑making that aligns technical solutions with our strategic business objectives. You will lead discipline‑specific project design reviews throughout all stages of project design and delivery. You will consult with members of our Engineering, Expansion, Construction, Commissioning, Quality, Safety, IT, Operations, Product, and Sales teams to ensure optimal design decisions are made through careful assessment of risks and opportunities. You will work closely with the Design Director to drive effectiveness, efficiency, and predictability at scale through the development and adoption of best‑practice design processes and procedures. You will support the management of the Design Execution team by providing guidance on workload planning, prioritisation, and development opportunities.

What we are looking for

Knowledge and Attributes

• In-depth expertise in high-reliability HVAC systems, heat rejection plants, energy efficiency, Power Usage Effectiveness (PUE) calculations and associated regulations, liquid cooling technologies, thermodynamics, fluid dynamics, failover mechanisms, and associated Building Management Systems (BMS)
• Thorough understanding of M&E systems and their relationship to controls
• Advanced proficiency in Computer‑Aided Design (CAD) software for complex engineering designs
• Strong ability to optimise and fine‑tune engineering systems for maximum efficiency
• Highly developed understanding of commissioning (Cx) processes and test scripts
• Comprehensive understanding of data centre infrastructure and its integration with engineering systems
• Strong leadership and mentoring skills, with the ability to guide and develop both internal and external engineering teams
• Proficient in managing personal and professional commitments while collaborating with teams across different time zones
• Strategic thinker with a structured and goal‑oriented approach
• Strong analytical and problem‑solving skills
• Ability to work effectively in multinational, interdisciplinary, and culturally diverse teams
• Passion for start‑up and ramp‑up environments
• Passion for listening to stakeholders and customers, combined with a world‑class delivery and service mindset
• Recognised technical expert in a design and/or specification discipline relevant to the data centre industry

Academic Qualifications and Certifications

University degree in Engineering (preferably Electrical Engineering, Mechanical Engineering, or a related discipline) Membership of a professional institution recognised as relevant to the data centre industry

Required Experience

• Minimum of 5 years of experience in data centres and/or other mission‑critical M&E‑driven industries
• Experience working within multidisciplinary design teams, preferably in a leadership role
• Experience in design consultant, client engineer, site engineer, and/or contractor engineer roles
• International experience, with exposure to different organisations, project types, and delivery environments
• Ideally experienced in working with colocation (colo) and hyperscale customers

What you will do

• Lead and oversee complex mechanical engineering projects from concept through execution, ensuring compliance with industry standards, regulations, and project requirements.
• Drive the implementation and localisation of the OPR and GRD to ensure Minimum Viable Product (MVP) delivery.
• Provide technical leadership, guidance, and mentorship to mid‑level and junior mechanical engineers.
• Collaborate with cross‑functional teams to drive continuous improvement and innovation in mechanical systems supporting data centre infrastructure.
• Contribute to the development, optimisation, and enhancement of mechanical systems and infrastructure upgrades.
• Stay informed of emerging technologies, industry trends, and engineering best practices, applying them to improve operational performance and reliability.
• Prepare and present technical reports, recommendations, and project updates to senior management.
• Lead Root Cause Analysis (RCA) investigations and implement corrective actions where required.
• Support commissioning activities as needed to ensure facilities are delivered "green and clean" and ready for operations.
• Make technical decisions that support project execution and align with NTT's strategic objectives throughout the design, construction, and commissioning phases.
• Review and approve Architect & Engineer (A&E), OFCI Vendor, and General Contractor (GC) design packages and technical submissions to minimise risk, reduce errors, and ensure MVP compliance throughout the project lifecycle, including design, construction, commissioning, and handover.
• Drive quality assurance and quality control (QA/QC) activities during the design and construction phases, including periodic site visits to ensure Resident Engineers (REs), Construction Managers, QA Managers, General Contractors, and Vendors are effectively supervising and delivering work to the required technical and construction standards.
• Resolve technical disputes and engineering issues among NTT and third‑party stakeholders during design, construction, and commissioning activities.
• Contribute to the continuous improvement of Design & Engineering processes, standards, and procedures.
• Interface with customers to evaluate the technical impact of customer‑driven changes and provide recommendations on appropriate solutions.

Who we are

As the third largest data centre provider, we operate over 150 data centres in more than 20 countries and regions. We understand that every business – large and small – has its own unique needs and goals. We offer local‑to‑global data centre expertise, aligned with our connected platform of AI‑ready data centres to create solutions that enable our clients to seamlessly scale their digital businesses, anywhere and anytime. Data centres are the foundation of the digital world and at NTT Global Data Centres, we are one of the largest providers across the globe. We offer a wide variety of exciting and challenging careers that deliver opportunities to shape our ever‑changing world. Our diverse, inspiring workforce is the heart and soul of our company, providing the best experience for our clients every day. By bringing together our global capabilities and local expertise, we help our clients achieve their goals, anywhere in the world. Together, we can accomplish the extraordinary and work to create a more sustainable world with rewarding benefits for everyone - clients, employees, investors, partners, and communities.