Hi guys,
This is a late post but let’s just give credits to where credits are due.
Some people have worked with Sameer Mohn and given bad feedback.
See this thread: https://www.sharetribe.com/community/t/image-stucked-in-processing-forever/839/23
A good developer is Eugene Konyaev. Professional, high-level of coding, gives suggestions of good additions you should include in your Sharetribe installation.
In any event, when working with developers make sure you check all work before you pay and provide feedback (on UpWork), because they will likely be not responsible for your messages after the project is over (even though they may tell you, if there is a problem because of my code, I will fix it for free).