"Get shit done" is by far the most important attribute of your first few employees. You need people who can work independently without a lot of direction, and focus on the right things while the rest of the world burns around them.

They don't need fancy credentials or to be super smart or have a great internet presence; what you should look for is a track-record of shipping, and evidence of independent work; and when you interview them, find out if they have good judgement, if they have a sense of when to trade off perfect for good enough, if they're able to diagnose and fix things when they're broken.

As you grow, you can add more traditional engineers to build a more conventional, well-rounded team. But most companies don't get to 20 employees if their first 5-10 aren't able to work quickly & make good decisions without getting side-tracked on all the myriad little distractions of designing the perfect framework for the framework, office politics, dev environment isn't quite right, etc, etc.