Custom Software Systems Inc.

Leesburg, VA

UEI
LNYXAGUM6SA7
CAGE
55ZF8
Primary NAICS
541511 Custom Computer Programming Services
SAM.gov registration
Active through

Company facts

SBA certifications
Women-Owned Small Business
· Current
HUBZone Firm
· Current
Self-certified in SAM.gov
  • For Profit Organization
  • Woman Owned Small Business
  • Woman Owned Business
  • Subchapter S Corporation
Entity structure
Corporate Entity (Not Tax Exempt)
NAICS codes registered in SAM.gov
Corporate family
SAM.gov registration date
Physical address
17 Loudoun St SE Fl 2, Leesburg, VA 20175, USA
Website
customsoftwaresystems.com
Founded
1990
Employees
11-50
Estimated annual revenue
$1M-$10M
Industry
  1. Information Technology
  2. Software & Services
  3. Internet Software & Services
SIC code
73 Business Services
Profiles

Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .

Recent federal awards

Custom Software Systems Inc.'s 5 most recent federal contract and grant awards, newest first. Amounts are dollars obligated.
Award Agency Obligated Awarded
Scalable homeland innovative enterprise layered defense (shield) initial order. Contract · HQ085926FF974 Missile Defense Agency $500
Under this BPA order, the contractor shall support the analysis, design, development, and implementation of payment… Contract · 2033H623F00120 Bureau of the Fiscal Service $1,120,741
Picoe operational support Contract · 2033H623F00010 Bureau of the Fiscal Service $1,795,310
Npirc legacy system support services Contract · 2033H623F00009 Bureau of the Fiscal Service $1,385,466
The contractor shall support the design, development, and implementation of an identity validation service for picoe. Contract · 2033H622F00148 Bureau of the Fiscal Service $410,496

About Custom Software Systems Inc.

Written by GovTribe AI ·

Custom Software Systems Inc., a women-owned small business and HUBZone-certified firm based in Leesburg, Virginia, operates as a prime contractor (98% of recent awards) delivering custom software development, data analytics, business process improvement, and IT infrastructure support to federal civilian agencies and defense customers. The vendor competes predominantly in full-and-open procurement rather than under set-asides, holding a prominent position on the GSA Multiple Award Schedule and recently securing a multi-billion-dollar IDIQ vehicle for defense modernization work.

The Department of the Treasury's Bureau of the Fiscal Service dominates Custom Software Systems' customer concentration, accounting for 35 awards with $55.7 million in combined potential value across 100% of the vendor's recent award footprint. This concentration reflects a sustained engagement pattern spanning multiple fiscal years, with the Bureau issuing repeated task orders under Custom Software Systems' GSA MAS contract for payment integrity system modernization, legacy system support, and data science services. Representative work includes a $1.12 million BPA call (August 2023) for custom business process improvement and data analytics supporting payment integrity capabilities, a $1.8 million award (October 2022) for PICOE operational support and legacy system maintenance, and a $1.1 million data science engagement (August 2022) supporting analytics capabilities in the Treasury's PICOE Analytics Cloud Environment. GSA Federal Acquisition Service ranks second in potential value with a single $33.4 million award, and the Missile Defense Agency entered the customer roster in December 2025 with a $151 billion multiple-award IDIQ contract under the Scalable Homeland Innovative Enterprise Layered Defense (SHIELD) program; the initial delivery order under SHIELD carries a $500 value and represents a gate opening into defense R&D, systems engineering, and prototype development across air, missile, space, and cyber domains.

Custom Software Systems holds positions on two primary vehicle platforms: the GSA Multiple Award Schedule (51 task orders, $69.4 million combined potential value) and the Information Technology Schedule 70 (18 task orders, $11 million combined potential value). The SHIELD IDIQ, with a ceiling extending through December 2035, adds a long-term contracting mechanism for Department of Defense task-order issuance in advanced defense modernization. The vendor's labor portfolio spans 11 active GSA labor categories with hourly rates ranging from $88.71 per hour (Technical Writer, Associate level) to $234.10 per hour (Subject Matter Expert, Level V), covering database administration, systems architecture, business process consulting, and security-cleared senior technical roles. The majority of work sits at mid-tier rates ($126–$156 per hour range) for database administration, systems architecture, and technical-lead roles.

Activity trajectory shows recent consolidation after a peak cycle. The vendor averaged 5–6 awards per year from 2020–2021, declined to 4 awards in 2022, fell to 1 award in 2023, and returned to 3 awards in 2025. Service Contract Inventory data confirms a revenue cliff: the vendor reported $3.7 million in invoiced SCI revenue in FY2022 across 13.8 FTEs but zero invoiced revenue in FY2023 and FY2024, with FTE trajectory collapsing to near zero in FY2024 (0.9 FTEs), reflecting either completion of major Treasury task orders or reclassification outside SCI-reportable thresholds. On SCI-covered prime contracts, government-paid rates ran a median of $135.96 per hour, with the 10th percentile at $122.01 per hour and the 90th percentile at $146.51 per hour.

Custom Software Systems operates predominantly as a self-contained delivery organization; across SCI-reportable prime contracts, subcontractor hours represent 1% of total contractor hours, with only one named subcontractor appearing in the source. The vendor maintains a subsidiary, CSS Solutions LLC, structured as a women-owned small business joint venture and HUBZone-self-certified entity. Sub-award activity is minimal: a single sub engagement appears in the source, a service-and-labor role under CACI Inc. (Federal) beginning January 2025 involving a purchasing-office responsibility transfer at Rock Island Arsenal. The vendor's primary NAICS footprint is 541512 (Custom Computer Programming Services), accounting for 38 of 40 awards, with two research-and-development awards under NAICS 541715 (R&D in Physical, Engineering, and Life Sciences, excluding Nanotech and Biotech).

Contract vehicles

Custom Software Systems Inc. holds a place on 3 federal contract vehicles. Active vehicles first.

SBA capabilities narrative

From the vendor's SBA profile

Custom Software Solutions and Support Services: PM & Oversight, DB & Data Management, ALM, Middleware Support, Oper & Maint, Identity and Access Mgmt, Software Dev, DevOps, Secure Access Control, Information Assurance, Cloud Solutions

Quick answers

What is Custom Software Systems Inc.'s UEI?

Custom Software Systems Inc.'s Unique Entity ID (UEI) in SAM.gov is LNYXAGUM6SA7.

What is Custom Software Systems Inc.'s CAGE code?

Custom Software Systems Inc.'s CAGE code is 55ZF8.

What is Custom Software Systems Inc.'s primary NAICS code?

Custom Software Systems Inc.'s primary NAICS code is 541511 (Custom Computer Programming Services).

Where is Custom Software Systems Inc. located?

Custom Software Systems Inc.'s physical address in SAM.gov is 17 Loudoun St SE Fl 2, Leesburg, VA 20175, USA.

Is Custom Software Systems Inc. registered in SAM.gov?

Yes. Custom Software Systems Inc.'s SAM.gov registration is active through October 15, 2026.

Which SBA certifications does Custom Software Systems Inc. hold?

Custom Software Systems Inc. holds Women-Owned Small Business and HUBZone Firm certifications from the SBA.

Which contract vehicles does Custom Software Systems Inc. hold?

Custom Software Systems Inc. holds a place on 3 federal contract vehicles, including IT-70, MAS and SHIELD.

What is Custom Software Systems Inc.'s most recent federal award?

Custom Software Systems Inc.'s most recent federal contract award is Scalable homeland innovative enterprise layered defense (shield) initial order (HQ085926FF974), from Missile Defense Agency, on December 29, 2025.

On GovTribe

See Custom Software Systems Inc.'s full federal record

  • Federal contract awards
  • IDV awards
  • Contract vehicles
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  • Funding analysis by agency, NAICS and set-aside
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