Flexible Contracting for Mission-Ready Solutions
Castellum, Inc and subsidiaries offer multiple contract vehicles that give federal agencies fast, streamlined access to expert enterprise services.
OASIS+
OASIS+ Unrestricted: 47QRCA25DU566
OASIS+ Small Business: 47QRCA25DSC30
Functional Areas
Unrestricted:
Management & Advisory
Technical & Engineering
Research & Development
Intelligence Services
Small Business:
Technical & Engineering
Research & Development
Intelligence Services
Points of Contact
April Tsirigotis
VP of Programs, Execution, and Support
atsirigotis@castellumus.com
(o) 301-475-8181
GSA MAS PSS
Schedule Title: Multiple Award Schedule Federal Supply Group: Professional Services & Scientific Management and Solutions FSC Class: R425
Contract Number: GS-00F-080GA
Period Covered by Contract: January 3, 2017 through January 2, 2027
Order-Level Materials (OLM)
SIN: 541330ENG – Engineering Services
SIN: 541611 – Professional Services
SIN: 541380 – Testing Laboratory Services
SIN: 541420 – Engineering System Design and Integration Services
GSA MAS IT Services
Schedule Title: Multiple Award Schedule Federal Supply Group: Information Technology
Contract Number: 47QTCA25D00F7
Period Covered by Contract: September 18, 2025, through September 17, 2030
Business Size: Other Than Small Business
SIN: 54151S/54151SRC - Information Technology Professional Services
MDA Shield
Multiple Missile Defense Agency SHIELD IDIQ
Schedule Title: Missle Defense Agency (MDA) Scalable Homeland Innovative Enterprise Layered Defense (SHIELD) Multiple Award
Contract Number: HQ085926DE124, HQ085926DF535, HQ085926DF238
Period Covered by Contract : December 29, 2025, through December 28, 2035
Business Size: Small
Functional Areas:
Science and Technology (S&T)
Research and Development (R&D)
Prototyping
Studies, Demonstrations, Testing of Prototypes
Disruptive Technologies
Experimentation
Architecture Development
Modeling, Simulation, and Analysis
Systems Engineering 2.10 Weapon Design and Development
Integration and Assembly
Production and Fielding
Test and Evaluation (T&E)
Operation and Sustainment
Modernization
Hardware and Software Modifications
Data Mining/Collection/Analysis
Facilities Engineering and Sustainment
Cybersecurity
NAWCAD SCI MAC
Special Compartmented Information Multiple Award Contract (“SCI MAC”)
Schedule Title: Sensitive Compartmented Information Services IDIQ
Contract Number: N0042125D0043
Period Covered by Contract :April 10, 2025, through April 6, 2030
Business Size: Business size determined at each Task Order Level
NAICS Code – 541330, PSC – R425
Functional Areas
Program Management Support
Engineering Support - Systems
Engineering Support - Avionics
Engineering Support - Airframe
Engineering Support - Power and Propulsion
Engineering Support - Flight Controls
Engineering Support - Materials
Engineering Support - Weapons
Engineering Support - Software
Engineering Support - Cyber/IT
Engineering Support - Human Systems
Engineering Support - Electronic Warfare
Engineering Support - Defensive Systems
Engineering Support - Airworthiness
Engineering Support - Test and Evaluation
Engineering / Technical - Other
Program Security Support
Logistics Support
Analysis Support
Performance of Test and Evaluation Activities
Software Development or Sustainment
SeaPort NxG
Schedule Title: SeaPort Next Generation
Contract Number: N0017819D7718
Period Covered by Contract: January 2, 2019, through January 1, 2029
Business Size: Other than Small Business
NAICS Code – 541330, PSC – R425