Four years ago, I was bored and talking to a friend of mine, joking about starting a scientific equipment business in a small niche (geophysics) where there was effectively only one competitor in our national market. Easy to disrupt. To my surprise, he said yes and we went all in. Still just the two of us, but I guess I didn't have to apply for that job, just have a fortuitous connection. Now I do the science parts and he does the business parts and it works great! Probably we will hire this year though, and it's very likely that LinkedIn will be the place we advertise.
The last tool I used? Does email count? ;) Ground Penetrating Radar.