Ask HN: Would you use a trial work jobs site?

I want to get some feedback on a startup idea. Currently as an engineer, if you switch jobs you are taking a bit of a risk, since you might not like the new work environment. Maybe the code quality is bad, or you don't like the project. So to solve this, the idea is to make a site where companies post paid trial projects. This let's engineers try out working for companies before leaving their job, and companies get some more signal as well.

Would you (as a company or an engineer) use a site like this? Why or why not?