Amazon Web Services (AWS) is seeking a Principal Level Commissioning Engineer to support the development and implementation of all aspects of the Commissioning Program for leased/owned data centers. This role, with an expert-level focus on the mechanical discipline of Commissioning, will serve as the primary liaison between Senior Engineers, Principal Engineers, Senior Managers, Directors, and VPs across the AWS team and external Commissioning Vendors. As a leader in the Data Center Capacity Delivery (DCCD) organization, you will research, develop, and ensure meticulous and timely delivery of our Data Centers. Principal Commissioning Engineers are hands-on, producing both detailed technical work and high-level program designs and process frameworks. They will aid in establishing testing methodologies, drive standardization, and increase quality across all AWS building sites. The successful candidate will have extensive experience in commissioning, program development and sustainment, and cross-functional collaboration. They must have a proven record of leading commissioning programs on large-scale critical infrastructure deployments, including Quality Control (QC), Startup, Functional Performance Testing (FPT), Integrated System Testing (IST), and cost- and schedule-mitigating measures. This position requires excellence in a fast-paced environment and the ability to manage concurrent responsibilities while supporting parallel initiatives.