On Site Systems Inc
On Site Systems Inc is a small business in Saint Louis, MO registered on SAM.gov to bid on federal contracts. It has won about $137,881 in federal prime contracts as a small business since fiscal year 2024, according to USAspending.gov.
- UEI
- STLMHDJNX5C7
- CAGE code
- 1QSS9
- SAM.gov registration
- Active
Federal contract history
Contract history from USAspending.gov is taking longer than usual to load. It will appear here in a moment, or when you reload the page in a few minutes.
Registration details
Show registration details
From SAM.gov's monthly public file dated Nov 1, 2026. If the business has updated its registration since, SAM.gov shows the newer details.
| Legal business name | On Site Systems Inc |
|---|---|
| Unique Entity ID (UEI) | STLMHDJNX5C7 |
| CAGE code | 1QSS9 |
| Location | Saint Louis, MO |
| SAM.gov registration | Active through Jul 14, 2027 |
| Business started | 1982 |
| Primary NAICS code | 541511: Custom Computer Programming Services |
| Website | www.hpassist.com |
| How to contact | Through its website above. No phone or email in SAM.gov's public file. Search UEI STLMHDJNX5C7 in SBA's Small Business Search for a contact the business added. |
Certifications and business types
No SBA certification (8(a), HUBZone or WOSB) in SAM.gov's public file (Nov 1, 2026).
SBA certifications let a business compete for set-aside contracts (set-asides explained). Check the current record on its SAM.gov entry.
How to check or correct this record
The file sometimes leaves a certification out, and a newer one won't be in it yet.
Check or correct this record at the source: open its SAM.gov entry, or search UEI STLMHDJNX5C7 () in SAM.gov's entity search (free sign-in) and in SBA's Small Business Search (formerly DSBS), which shows SBA certifications. The business can update its details in its SAM.gov registration and its certifications at certifications.sba.gov.
NAICS codes On Site Systems Inc is small under
On its SAM.gov registration, On Site Systems Inc meets the SBA size standard for these industries, so it can bid on small business set-asides that use them.
Open contracts in On Site Systems Inc's NAICS codes
37 open federal opportunities on SAM.gov use one of On Site Systems Inc's NAICS codes and may be open to it: no set-aside, or, in the codes it is registered small under, a small business set-aside. Here are a few, those in its primary code first (none of these are in Missouri right now), then the soonest due.
- RFI VHA Radiology and Cardiology Enterprise Imaging
✦ Veterans Affairs (Technology Acquisition Center NJ) posted an update to its request for information (RFI) 36C10B26Q0453 on a single enterprise imaging system for radiology and…
Due in 3 daysNov 10, 2026, 10:00 AM ESTThe AI summary flags this date. Check SAM.gov.
- F-35 JPO Enterprise Data Science and Analytics Support
Due in 3 daysNov 10, 2026, 5:00 PM EST
- SILVAH software coding
✦ The USDA Forest Service (solicitation 12760426Q0195) is running a sources sought (market research) to find small businesses that can repair SILVAH version 8, a forestry decision…
Due in 4 daysNov 11, 2026, 3:00 PM EST
- Training Simulators & Mobile Applications Development & Maintenance for the USAF Expeditionary Operations School at Joint Base McGuire-Dix-Lakehurst NJ
✦ The Air Force's 87th Contracting Squadron at Joint Base McGuire-Dix-Lakehurst, NJ is looking for small businesses that can develop and maintain training simulators and mobile…
Due in 5 daysNov 12, 2026, 5:00 PM EST
- Request for White Papers: Intelligence Resource Execution and Oversight (Project Argus)
Due in 6 daysNov 13, 2026, 5:00 PM EST
Similar small businesses
Other small businesses of a similar size with the same primary NAICS code (541511) that have won federal contracts in Missouri and nearby states:
- ILG Technologies LLC, Jefferson City, MO
- Nvision IT LLC, Chesterfield, MO
- Stauder Consulting, Inc., Saint Peters, MO
- Dakota Systems Inc, Chicago, IL
- Raymond C. Gorman Jr, Prairie Village, KS
- Facex, LLC, Iowa City, IA
Is this your business? Get a reminder before the SAM.gov registration expires
Get a reminder before the SAM.gov registration expires. It's active through Jul 14, 2027. We'll email you 60, 30 and 7 days ahead, and if it lapses.
Frequently asked questions
What is On Site Systems Inc's CAGE code?
On Site Systems Inc's CAGE code is 1QSS9. The Defense Logistics Agency assigns CAGE codes when a business registers on SAM.gov.
What is On Site Systems Inc's UEI?
On Site Systems Inc's Unique Entity ID (UEI) is STLMHDJNX5C7. SAM.gov assigns the UEI, and it identifies the business across the federal government.
Is On Site Systems Inc's SAM.gov registration active?
Yes, as of SAM.gov's public data from Nov 1, 2026, On Site Systems Inc's registration is active through Jul 14, 2027. Registrations are renewed every year.
Is On Site Systems Inc a small business?
On Site Systems Inc is registered on SAM.gov as small under 2 NAICS codes, including its primary code, 541511. Size is set per NAICS code, so a business can be small for some contracts and not others.
Keep going
- Look up another business's CAGE code or UEI
- Check a SAM.gov registration's status
- How to become a government subcontractor
- Hiring subcontractors? List small businesses by state, NAICS code and certification
Registration details come from SAM.gov's public entity extract and contract figures from USAspending.gov. Contact names and street addresses are left out. To change these details, update the registration on SAM.gov. To report a mistake on this page, or to ask us to remove it, email hello@fedready.us with the page address; we reply within 2 business days. For a removal, write from an address at the company.