Jones Lang LaSalle Americas, Inc. (JLL) seeks a Mechanical Subject Matter Expert for data centers to lead mechanical strategy, reliability, and performance across mission-critical facilities. You will provide technical oversight of HVAC and cooling systems, develop standards, and support design reviews, commissioning, and root cause investigations to ensure uptime and resilience. Partner with operations, projects, and clients to drive energy efficiency, sustainability, and compliance. This role offers exposure to global portfolios, cutting-edge technologies, and opportunities to shape innovative, sustainable data center solutions within JLL's performance-driven, collaborative culture. Responsibilities Serve as mechanical subject matter expert for data center facilities across JLL's portfolio Oversee design reviews, commissioning, and performance of HVAC and critical cooling systems Develop and maintain mechanical standards, SOPs/MOPs/EOPs, and best practices for uptime and resilience Lead root cause analysis and corrective actions for mechanical incidents and reliability issues Drive energy efficiency, sustainability, and capacity optimization initiatives Collaborate with operations, project management, and clients on upgrades and new builds Ensure compliance with codes, standards, and safety requirements Manage vendor relationships and technical input for mechanical equipment procurement Provide technical mentoring and training to site and engineering teams Support strategic planning and reporting for mechanical risk, performance, and lifecycle costs Required Skills Mechanical systems design (HVAC, cooling, CRAC/CRAH) Data center infrastructure (UPS, generators, BMS/SCADA interfaces) Reliability engineering and root cause analysis Capacity planning and load calculations Commissioning and integrated systems testing Energy efficiency and sustainability strategies Technical standards and documentation (SOP/MOP/EOP) Regulatory and code compliance Vendor and project management Computer-Aided Design (CAD) and simulation tools