CSS Solutions, LLC
Leesburg, VA Part of Custom Software Systems Inc.
- UEI
- YARBVKVJMDM9
- CAGE
- 9BZ00
- Primary NAICS
- 541512 Computer Systems Design Services
- SAM.gov registration
- Active through
Company facts
- Self-certified in SAM.gov
- Entity structure
- Partnership or Limited Liability Partnership
- NAICS codes registered in SAM.gov
-
- 541512 Computer Systems Design Services Primary
- 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services
- 541511 Custom Computer Programming Services
- 541513 Computer Facilities Management Services
- 541519 Other Computer Related Services
- 541611 Administrative Management and General Management Consulting Services
- 541618 Other Management Consulting Services
- 541690 Other Scientific and Technical Consulting Services
- Corporate family
-
-
Custom Software Systems Inc.
Parent
LNYXAGUM6SA7
- CSS Solutions, LLC YARBVKVJMDM9
-
Custom Software Systems Inc.
Parent
LNYXAGUM6SA7
- SAM.gov registration date
- Physical address
- 17 Loudoun St SE #103, Leesburg, VA 20175, USA
- Website
- css-sol.com
- Industry
-
- Information Technology
- Software & Services
- Internet Software & Services
- SIC code
- 73 Business Services
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Recent federal awards
| Award | Agency | Obligated | Awarded |
|---|---|---|---|
| Scalable homeland innovative enterprise layered defense (shield) initial order. | Missile Defense Agency | $500 |
About CSS Solutions, LLC
CSS Solutions, LLC, a woman-owned small business and HUBZone-certified joint venture based in Leesburg, Virginia, holds seats on four major GSA OASIS+ multiple-award IDIQs and a federal supply schedule as a prime contractor, with recent work spanning defense research and development, professional services, and IT consulting across GSA and the Department of Defense Missile Defense Agency.
CSS Solutions operates as a limited liability partnership and subsidiary of Custom Software Systems Inc., a Subchapter S corporation parent that also holds SBA woman-owned small business and HUBZone certifications. The vendor's federal posture is dominated by set-aside vehicles: three OASIS+ IDIQs reserved for women-owned small businesses, HUBZone firms, and total small businesses respectively, awarded by GSA's Federal Acquisition Service between April and June 2025, each carrying a multi-billion-dollar ceiling. A fourth OASIS+ vehicle, the Scalable Homeland Innovative Enterprise Layered Defense (SHIELD) contract awarded by the Missile Defense Agency on December 29, 2025, operates under full and open competition with a $151 billion ceiling and extends through December 28, 2035. CSS Solutions also holds a Federal Supply Schedule contract with GSA (awarded June 2024, ceiling $500,000, running through June 6, 2029) covering IT analysis, business analysis, project management, cloud services, and general consulting labor.
Customer concentration is split between GSA and the Missile Defense Agency. GSA Federal Acquisition Service represents 100% of award count and potential value across the four OASIS+ and schedule vehicles (combined potential value $500 thousand); the Missile Defense Agency accounts for two awards totaling five hundred dollars in potential value tied to the SHIELD initial order. The portfolio is nascent — six awards total across 2024 and 2025 — with one task order placed against SHIELD (five hundred dollars) and minimal obligated dollars (eight thousand dollars, or 2% of combined potential value). Award activity accelerated from one in 2024 to five in 2025, reflecting the recent standing-up of the OASIS+ seats and the SHIELD vehicle. The OASIS+ vehicles span seven functional domains (Management and Advisory, Technical and Engineering, Research and Development, Intelligence Services, Environmental Services, Facilities, and Logistics) and carry five-year base periods extending through 2030 with one additional five-year option, positioning CSS Solutions for multi-year task-order activity under set-aside vehicles once federal agencies begin issuing orders.
CSS Solutions holds no subcontract relationships in the source data and operates exclusively as a prime contractor across all awards.
Contract vehicles
Quick answers
What is CSS Solutions, LLC's UEI?
CSS Solutions, LLC's Unique Entity ID (UEI) in SAM.gov is YARBVKVJMDM9.
What is CSS Solutions, LLC's CAGE code?
CSS Solutions, LLC's CAGE code is 9BZ00.
What is CSS Solutions, LLC's primary NAICS code?
CSS Solutions, LLC's primary NAICS code is 541512 (Computer Systems Design Services).
Where is CSS Solutions, LLC located?
CSS Solutions, LLC's physical address in SAM.gov is 17 Loudoun St SE #103, Leesburg, VA 20175, USA.
Is CSS Solutions, LLC registered in SAM.gov?
Yes. CSS Solutions, LLC's SAM.gov registration is active through October 15, 2026.
Who is CSS Solutions, LLC's parent company?
CSS Solutions, LLC is part of Custom Software Systems Inc.
Which contract vehicles does CSS Solutions, LLC hold?
CSS Solutions, LLC holds a place on 5 federal contract vehicles, including MAS, OASIS+ HUBZone Small Business IDIQ and OASIS+ WOSB IDIQ.
What is CSS Solutions, LLC's most recent federal award?
CSS Solutions, LLC's most recent federal contract award is Scalable homeland innovative enterprise layered defense (shield) initial order (HQ085926FE371), from Missile Defense Agency, on December 29, 2025.
On GovTribe
See CSS Solutions, LLC's full federal record
- Federal contract awards
- IDV awards
- Contract vehicles
- Funding analysis by agency, NAICS and set-aside
- Similar vendors