I spent a lot of time going to angel rounds, vc meetups. Talking to a lot of people about their issues, what they needed. It was a great way to get exposed to a myriad of problems. Angel.co is also a good one for finding places where some one has an idea, but needs tech help.

The problem I had. Is that a majority of what I came across was mobile and web orientated. As a back-end dev, it's not something I can help with. Especially when for the pitch deck metrics/numbers and a pretty demo are the big selling points.