Also, he shouldn’t plan on being employed by a US company since immigration rules are strict and have significantly changed. He should plan on returning to his home country after graduation.
A company has to comply with the federal rules when employing a non US citizen. They have to state that no US citizens can be found to fill a position and they need to provide documentation that published attempts were made to find US applicants.
Non-US employees have to be willing to find a sponsor company who will do all of the visa paperwork, wait a certain amount of time, and pay fees towards the visa.