Mary Esther Castillo

Mary Esther Castillo serves as a Contract Specialist within the FA3016 502 Cons Cl under the Department of the Air Force, where she plays a pivotal role in executing mission-critical procurement actions to sustain Air Force infrastructure and operational readiness. She manages the full lifecycle of acquisitions for specialized maintenance, medical, and facility services, ensuring compliance with federal regulations and alignment with strategic modernization goals. Her portfolio emphasizes complex service contracts requiring technical oversight, including communications systems, facility upgrades, and logistical support, all critical to maintaining safe and technologically advanced installations. Castillo maintains consistent working relationships with a core group of contractors including WILLIAM T BROOKS & ASSOCIATES INC, CITADEL FEDERAL SOLUTIONS LLC, NEXLEGACY LLC, PERRY MANAGEMENT CORP OF SOUTH DAKOTA, L.L.C, and AJ COMMERCIAL SERVICES, INC. These partnerships reflect a preference for established vendors with demonstrated expertise in government-contracted services, particularly in facility operations, administrative support, and niche technical fields. Her contracting patterns suggest a focus on reliable, repeat performers capable of delivering high-stakes, mission-support services under tight operational timelines. A strong advocate for small business participation, Castillo consistently prioritizes Small Business Set-Asides under FAR 19.5, with approximately 60% of her acquisitions reserved for small businesses. This reflects a deliberate socioeconomic strategy to foster vendor diversity and enhance competition while ensuring access to qualified, capable small firms. Her pattern shows minimal use of other socioeconomic set-asides, indicating a focus on broad small business eligibility rather than targeted programs like 8(a) or HUBZone. Her procurement activity centers on four key NAICS categories: 511210 (Software Publishers), 541611 (Management Consulting Services), 491110 (Postal Service), and 332996 (Fabricated Pipe and Pipe Fitting Manufacturing). This diverse technical footprint underscores her expertise in procuring both digital services and specialized industrial components, bridging administrative, technological, and physical infrastructure needs across Air Force installations.