Stacey Macmillan

Stacey Macmillan serves as a key procurement professional within the Information Technology Acquisition Center (70RTAC) of the Department of Homeland Security, where she plays a central role in advancing the agency’s mission to modernize critical cyber and IT infrastructure. She manages complex acquisitions for advanced information technology services, with a focus on custom software development, cybersecurity solutions, and mission-critical platform modernization. Her work directly supports the operational resilience of federal protective and intelligence systems by ensuring the timely delivery of secure, scalable, and interoperable digital capabilities aligned with DHS strategic priorities. Macmillan engages with a diverse ecosystem of technology vendors, including specialized IT services firms, cybersecurity consultants, and systems integrators capable of delivering tailored software and technical support. While no single contractor dominates her portfolio, she consistently partners with firms possessing deep expertise in federal compliance, zero-trust architecture, and cloud-native development. Her contracting approach emphasizes performance-based outcomes, rigorous technical evaluation, and vendor accountability to ensure mission success across high-stakes environments. Her procurement patterns reflect a strong preference for open competition, with 100% of acquisitions conducted without set-asides, indicating a focus on technical capability and mission readiness over socioeconomic categorization. This approach prioritizes the selection of the most qualified providers regardless of business size or certification status, aligning with the urgency and complexity of national security requirements. Macmillan’s primary acquisition focus lies in NAICS 541511 (Custom Computer Programming Services), 541519 (Other Computer-Related Services), and 541990 (All Other Professional, Scientific, and Technical Services), underscoring her specialization in bespoke software development, systems integration, and advanced technical consulting. She routinely procures services involving secure coding, threat modeling, DevSecOps implementation, and cloud migration—domain areas critical to sustaining DHS’s cyber defense posture and digital transformation initiatives.