We've switched our backend framework from PHP to Node.js.
We've also fixed some validation issues, so you should be able to use features like adding trackers and uploading without any issues.
By the way, we've also finalized the upload functionality, providing more validation for uploaded content. You can now verify that the booth link you entered is correct (via a preview!).
Of course, this isn't the end of the road! We have a lot more on our roadmap.