W.r.t hiring, I can share some thing that really worked for me: Engineering: I've had great success with giving prospects who pass the initial screen, a small real world problem or user story in our codebase. No NDA, just show them a User Story, and ask them how they'd go about it. And just listen. Make it interactive. For example, I'd deliberately leave out a couple of details in User Story. So if the Engineer starts solutioning rightaway that's a red flag.
I've also shown snippets of code that has a simple bug, and asked them to "read" the code and figure out what might be wrong. The best engineers are ones who can read and understand other people's code also, in addition to their own.
Wishing you the best, in the next iteration of your entrepreneurial adventure!