I am looking to pair with developers for side projects to take my concepts from ideas /prototypes to actual products/apps.

If you have an idea for a mobile/web app is it realistic to find someone to partner with, or would you have to pay for the development? Either way, how would you go about finding someone? I'm right out of school, so I don't know a ton of developers, if any, and I don't have the most money to pay developers.

I've come across upwork.com and builditwithme.com (doesn't seem all that active).

Do people just naturally run into developers as you work in the industry?