After a brief call with a hiring manager, all technical rounds were outsourced to a company called BarRaiser. I sat for 4 rounds for technical interviews over a period of 3 weeks. Interviews were quite generic and mostly discussed about concepts in a general sense. There was a feedback after each technical interview. After the last round there was complete radio silence for over a month. Since BarRaiser is merely a vendor here, I didn't feel like asking them for a follow up. Upon emailing the hiring manager and other relevant staff there was no response from them.