Stat with regression related question, giving a detailed linear regression model.( like explain the coefficient, R^2, type 1 & type 2 error) A/B testing, like if there is multi-class testing, what's the common pitfall? What's FDR, how to calculate it.

DROPPED BY TEXT MESSAGE. I went through seven rounds of interviews at Netflix, receiving positive feedback throughout. The process felt professional until the very end. I was told I advanced to the final stage, and a call was scheduled. Ten minutes before that final call, I received a text message saying it had to be rescheduled. Three days later, HR followed up — again by text message — to tell me the position had already been filled and I would not move forward. I never received an official email confirming this, despite asking for one. The explanation given was that “perhaps the server failed.” To this day, all communication regarding my rejection has only been by text message. I still believe Netflix is an outstanding company, but this experience raised serious concerns about candidate communication and process consistency. Preparing for a final interview only to be dropped informally via text message (without having that call) was one of the most disappointing interview experiences I’ve had in 10+ years.