They ask me give a talk about my research. I visit their group and talked with lab manager for ten minutes, then he showed me the work environment. I give them a presentation for one hour, and they ask me some questions. At last, the manager talked with me again and give me some advice.

Pretty straight forward, I sent an e mail to the supervisor whether he was looking for a Postdoctoral Research Scholar or not. He was positive, asked for a couple of recommendation letters, I got them sent to him and I made a presentation over skype and I was offered the job.