Backstory: Pair programming is proving to be more productive and better for culture/morale. It keeps people actively engaged, levels up your Jr developers and improves overall code quality by having two eyes on the problem.

The Idea: A platform that allows you to earn credits by pair programming and buy/use credits to pair program with others.

Deep Dive: Freelancing is becoming ever popular. Programming by yourself in a corner becomes lonely, boring and your skills can plateau.

Validation: There are a few of these popping up already, https://codeshare.io/ and http://www.pairprogramwith.me/ . None have yet to gain a significant amount of dominance.

Monetization: You could sell ad space as well as make money from selling credits for pair programming. Different developers would have different rates based off skill and reviews.