Investment Banking Summer Analyst

I applied online in the beginning of December. I contacted the HR directly and applied according to how she told me to apply. At the beginning of January, I received an email that said I had been selected for a first-round phone interview. The email also specified that I had to choose the location where I wanted to work; I chose San Francisco because I was interested in tech, it was closer to where I live than NY, and I thought I had a better chance there. The phone interview was with an analyst, and somehow I passed that to end up in the final round superday (received email less than a week after). The company flew me to SF, and I had three interviews: 1-on-1 with a director, 2-on-1 with analysts, and 1-on-1 with an analyst. The director and last analyst were very laid back and asked mostly fit/resume questions, but one of the analysts in the 2-on-1 grilled me hard on technicals and accounting. I felt very good though because I connected well with the director, and I left the superday interview smiling. They later called me when I was on the train back to the airport with an offer.