iqatar
I don't know if you're working or have worked on an airline of QR size. This kind of corporations have several independant departments that work each on their purpose. When you applied and got the interview and later sucess email you've been handled by the recruitment department, then they have to ask permition to the HR dept to hire you ( apointment) and they will send you a formal letter of employment offer. If you acept it, your process will be forwarded to the recruitment dept again to handle all the red tape and logistics of your joinning. You will be in their hand untill the first couple of weeks after joinning, when you'll be "delivered" to your fleet dept for ground course, sim and line trainning. So as you can see, several hoops to jump through but at least for the final ones you'll have some assistance...
Nice landings