a third party company to escrow the funds of both developers and admins is a big help to both parties.
I'd suggest using a multi-sig escrow if possible, and not relying on a third party to escrow your funds. Unlike fiat, you have other options to increase the chance that you get your funds after you finish your job, utilizing that feature would be a great idea. Especially after the recent collapse of many centralized platforms due to bad management, lying about their operations, etc.