Sarah C. Callies

Sarah C. Callies serves as a Contract Specialist within the Public Buildings Service’s R8 Acquisition Management Division, where she plays a pivotal role in executing complex procurement actions for federal facility infrastructure and operational support services. Her responsibilities encompass the full lifecycle of contract award and administration, from solicitation development through contract performance oversight, ensuring compliance with FAR and agency-specific policies. She primarily manages design-build construction, facility modernization, and integrated building services contracts that support the safety, functionality, and efficiency of federal buildings and land ports of entry nationwide. Callies maintains consistent working relationships with a core group of contractors including LEA MARIE LLC, SECURITYHUNTER, INC., MCKENZIE CONSTRUCTION & SITE DEVELOPMENT LLC, and HANDYMAN NATION INC., reflecting a preference for established, regionally focused vendors with proven capabilities in construction and security services. Her contracting patterns emphasize collaborative, performance-based engagements that prioritize reliability, regulatory adherence, and timely delivery of mission-critical services. She demonstrates a strong commitment to socioeconomic contracting, with nearly 43% of her awards designated as total small business set-asides under FAR 19.5, complemented by significant allocations to service-disabled veteran-owned small businesses (21.4%) and HUBZone firms (7.1%). Her approach actively promotes equitable access to federal opportunities, aligning with GSA’s broader small business inclusion goals. Her procurement focus centers on NAICS 236220 (Commercial and Institutional Building Construction) and 561621 (Security Systems Services), with additional emphasis on professional technical services under 541990. She routinely procures integrated construction, facility maintenance, physical security systems, and specialized consulting services, demonstrating deep expertise in the built environment and federal facility operations domain.