After introduce myself, the manager just told me how the traders do their trading and how I could get start. After get yourself pass the Series 7 Test, you can start working in there.
I applied online. I interviewed at Quasar Trading (New York, NY) in Feb 2016
Interview
I applied this position through campus website. It tooks approximate 2 weeks. It's a skype interview. it lasted for 20 minutes. No financial questions, No technical questions. Just introduce the company and the position. Manager is very nice.