Hiring Freelance Developer - Any advice or pointers?

Hello Indie Hackers!

I am a software engineer who is looking to hire a freelance developer to finish a side project that I have been working on for several months, but just do not have time to finish.

I plan to hire from upwork, because I have had success hiring from there in the past. Does anyone have any advice or pointers as I embark down this path?

thanks!

Peter