All Other Professional, Scientific, and Technical Services: NAICS 541990
Browse federal contract opportunities classified under NAICS code 541990 (All Other Professional, Scientific, and Technical Services). Find active solicitations on SAM.gov, understand size standards, and discover set-aside opportunities for your business.
About NAICS 541990
All Other Professional, Scientific, and Technical Services. This industry falls under the Professional, Scientific, and Technical Services sector (NAICS codes beginning with 54).
Federal agencies use NAICS code 541990 when posting contract opportunities on SAM.gov to classify the type of work being solicited. Businesses that operate in the all other professional, scientific, and technical services space should include this code in their SAM.gov registration and capability statements to ensure they appear in relevant searches.
How to Use NAICS 541990 in Federal Contracting
To compete for federal contracts under NAICS 541990, your business should be registered in SAM.gov with this NAICS code listed in your entity profile. When agencies post solicitations for all other professional, scientific, and technical services work, they reference this code to determine the applicable small business size standard and any set-aside eligibility.
If you hold certifications such as 8(a), HUBZone, SDVOSB, or WOSB, you may be eligible for set-aside contracts under this NAICS code. These set-asides limit competition to certified small businesses, giving you a significant advantage in winning federal work.
FedOverwatch monitors SAM.gov daily and can automatically match you with new opportunities under NAICS 541990. Set up your profile with your NAICS codes and certifications to receive personalized contract alerts.
NAICS 541990 Market Intelligence
Based on 3 years of federal award data from USAspending.gov, the all other professional, scientific, and technical services market has seen 28,403 contract awards totaling $38.2B in value. The median contract size is $148K, with approximately 789 new awards per month.
Total Awards (3yr)
28,403
Total Value
$38.2B
Median Contract
$148K
Competitors
4,292
Contract value distribution
14,579 small business awards ($7.2B total value,$115K median)
4,292 companies compete for NAICS 541990 contracts
See who's winning, their award values, and where you fit in the market
Explore CompetitorsSize Standards
The SBA establishes size standards for each NAICS code to define what qualifies as a "small business" for federal contracting purposes. For NAICS 541990 (All Other Professional, Scientific, and Technical Services), the size standard is based on either average annual receipts or number of employees, depending on the specific industry. Meeting the size standard for your primary NAICS code is required to qualify for small business set-aside contracts.
Visit the SBA Size Standards Table to find the current threshold for NAICS 541990.
Recent NAICS 541990 Opportunities
View all →The U.S. Postal Service is seeking a Business Process Engineer for the Office of Inspector General. The key requirements include expertise in professional, scientific, and technical services related to engineering and technical support.
The Department of Defense is seeking Examination Support Services for the Biometrics Operations Division to enhance biometric and latent identification capabilities in support of the National Defense Strategy. The contractor will manage biometric data repositories, develop standards for data handling, and support research efforts, with a performance period of twelve months and up to four additional option periods. The work will be conducted at the DACID BOD Facility in Clarksburg, WV.
The Department of Defense is procuring Medical Instructor/Operator Support Services (MIOSS) to provide continuous support for Military Simulation Training Centers (MSTCs) and other training events both within the continental United States and overseas. The contract will be a single award Firm Fixed Price with a base period and four one-year option periods, requiring proposals to be submitted by 10 August 2026.
The Department of Veterans Affairs is procuring fire alarm system inspection, testing, maintenance, and certification services for the Bedford VA Medical Center. The contractor will be responsible for a comprehensive range of services including fire alarm detection systems, fire sprinkler systems, fire suppression systems, and associated components as detailed in the Statement of Work. This procurement is set aside for Service-Disabled Veteran-Owned Small Businesses.
The Department of the Interior's Bureau of Reclamation is procuring aquatic invasive species watercraft inspection services for Elephant Butte. The requirement involves the inspection of ships, small craft, pontoons, and floating docks for the 2026-2027 period.
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