The process depends on how you're being brought in. Most newbies would have more levels of interviews. Transferrees would have around 2. If your name resounds well within the organization, you will have this as formality. At the end of each process, a Managing Director will close the process.

Recommended by an internal employee, the process took a dreadful 6 month, from HR call, to HR meeting on site, to manager interview and final round. They made me wait 6 month to do the final interview and final offered either to go work in another city or either to cross fingers and see if any position would free up in the current office I applied to: end result, no offer, wasted my time and money. I never seen such a disinterested HR who I had to call back every 2 weeks to get things moving.