The NAICS code for engineering is 541330, Engineering Services.
Also searched as: engineering firm, engineering services.
Best match
Businesses primarily engaged in applying physical laws and principles of engineering in the design, development, and utilization of machines, materials, instruments, structures, processes, and systems.
Census NAICS lines under 541330 that match engineering:
541330, Engineering Services. Businesses primarily engaged in applying physical laws and principles of engineering in the design, development, and utilization of machines, materials, instruments, structures, processes, and systems.
The one on the solicitation. Federal agencies assign one NAICS code to each solicitation, and the SBA size standard of that code decides whether you count as a small business for that bid.
Source: U.S. Census Bureau, 2022 NAICS (public domain). PublicBeam is independent and not affiliated with the Census Bureau or any agency. Always check the NAICS code in the official notice before you bid.