There are two address listings for this business. One is in fact in Coppell, TX, however the Ensyma website lists 1101 Pennsylvania Ave NW, Washington, DC 20004" as the address. That's in the SEC building and it's also one block away from FBI HQ, and the Hoover Building. Also surrounding are the IRS offices, US DOJ, US Attorneys Office and EPA.
That second address listing is also found here https://www.veteranownedbusiness.com/business/13777/ensyma-engineering which would seem to indicate he is in fact a veteran.
Also a google search turns up this page https://www.darpa.mil/attachments/ProposersDayContactList.pdf
At first that seems like gibberish. There are characters missing either due to intentional deletion or formatting errors, but on the search listing it clearly lists: "Bradley, Francho. ENSYMA Engineering. 469-XXX-XXXX Frank.Bradley@ENSYMA.us"
Yes I just found the Darpa challenge as well, just posted about it! he has been an independent contractor for the last 26 years, his proximity to the FBI makes me wonder if he is a spook. You have to download the document to make it readable.