We are doing several projects with GO Digital from the USA and Europe in the outstaff format. They put up very cool specialists, both in technical skills and in soft skills. They even lured specialists from the top Russian companies. If there were not enough of their specialists, then they quickly found the right ones. There was a case when 1 week and 1 day passed from the application to the release of a person, taking into account hiring and signing a contract.
On the other hand, I would like to note the high quality control of the work of their own employees, even when they are working on outstaff basis. The guys are constantly collecting feedback, working on improvements and suggesting process improvements.
Finally, they build long-term partnerships, honor agreements and don't cheat. And in case of disputable situations, they searched for and offered options for resolving the situation, which were not just compromises, but beneficial to all parties.