Ask HN: Service to hire a temporary pair programmer

I need the ability to hire people with specific expertise for an hour or two at a time.

Say I'm stuck on a problem with a specific tool or programming language. It would just be nice to pay $50-100 for 1-2 hours to hire someone who's an expert in a specific tool to help out.

Right now I'm stuck on a React but and have spent 2-3 days working on it. I think an expert could have resolved it in an hour or so.

Are there any services for this?

I've found code review services but this isn't really what I'm looking for.