I internally have something I call the "scramble score". If I hire someone to say, do some python backend and then a few weeks in I'm like "oh shit, actually this big deal we're doing needs us to get an iphone app together" and I can be like "hey, can you go from python backend to do an iphone app?" and a week or so later I'd have a basic app.

Those people do exist. Really, they think it's a thrilling joyride. Hard to find, but they're real. I look for those and run the team tight and small.