Stephannie Siembab

Stephannie Siembab serves as a Contracting Officer within the Air Force Research Laboratory’s Propulsion Directorate (FA8650), where she manages complex acquisitions supporting advanced aerospace propulsion, hypersonics, and high-performance materials research. Her portfolio encompasses fundamental and applied R&D contracts critical to sustaining U.S. air and space dominance, including flight control systems, adaptive propulsion technologies, and next-generation functional materials. She plays a pivotal role in translating technical requirements into legally compliant, performance-based solicitations that align with Air Force modernization priorities, ensuring timely delivery of mission-critical capabilities through full and open competition. Siembab maintains consistent working relationships with industry leaders including UES Inc., General Electric Company, DCS Corporation, Spirit Aerosystems Inc., and Advanced Thermoplastic Composites LLC. These partnerships reflect a preference for established defense contractors with deep expertise in propulsion systems, composite manufacturing, and systems integration. Her contracting approach emphasizes technical rigor, risk mitigation, and performance outcomes, often leveraging cost-reimbursement and time-and-materials contract types to accommodate the iterative nature of advanced R&D programs. Her procurement activity is exclusively conducted under full and open competition, with no set-asides for 8(a), HUBZone, SDVOSB, or other socioeconomic programs. This reflects the highly specialized, mission-critical nature of the technologies she procures, where domain expertise and proven technical capability take precedence over socioeconomic preferences. Siembab’s primary NAICS focus lies in research and development services (541712 and 541715), with significant activity in support services (561990) and professional scientific services (541990). She also procures specialized manufacturing under 334220 for advanced radio and communication systems integrated into propulsion platforms. Her expertise centers on high-tech, low-volume R&D contracts requiring deep engineering collaboration, rapid prototyping, and stringent compliance with federal aerospace standards.