Longi Engineering is certified by the following governmental agencies:

• Small Business Administration-SDB (Small Disadvantaged Business) certification
• Metropolitan Transportation Authority – DBE
• New Jersey Transit – MBE/DBE
• New York City Department of Business Services – MBE
• New York State Department of Transportation – DBE
• School Construction Authority – MBE
• New Jersey State Department of Commerce – MBE
• The Port Authority of NY&NJ – SBE/MBE
• Niagara Frontier Transportation Authority – DBE
• Amtrak – MBE
• New York State Dept of Economic Development – MBE
• New Jersey State Department of Transportation – DBE
• Connecticut Department of Transportation.- DBE
• Washington Metropolitan Area Transit Authority – DBE.
• New York City Housing Authority – MBE
• Maryland Department of Transportation – DBE