Note: I was interviewing as a new grad for their Bell Labs program.
It was a pretty mediocre, if not, a puzzling simple interview process. There were supposedly three to four rounds: one was supposed to be a get to know, preliminary round, second was a take home assessment, third was a technical remote interview, and fourth was a cultural fit slash behavioral interview.
So for my first round, I scheduled an interview to speak with one of their recruiters after dropping an application through their job listing for candidates they spoke with through Grace Hopper. When the day my call was scheduled for came, I waited for a couple of minutes but never got any call. I sent an email but never heard back and thought they had just forgotten me.
Two to three weeks later, I got an email for a coding challenge which, at the time I was interviewing with more companies, I decided to take a chance at for practice. I don't recall whether there was a time limit or not; there might have been one but it was kind of arbitrary. The coding challenge had three questions: first was a simple typical programming challenge which I wrote a simple for loop program for, second was a simple SQL problem, and third was a high scoreboard class design type question (there were some methods they wanted you to implement). At this point, I was pretty tired because I did another coding challenge for another company prior so I decided to just not do the third one, lol.
To my surprise, I was offerred to continue with the interview process, where the next step is to discuss with an engineer about a problem. I was instructed to work on the problem before the interview and when I opened the coderpad link they sent me, lo and behold, it was the scoreboard challenge I didn't do, lol. So I spent around an hour and a half working on it, making some mental notes to myself about it. During the actual interview, I spent most of it discussing my reasoning of what I did, data structures I used, etc. The interviewer asked me to implement some other code on top of it. Pretty standard stuff.
Finally, I was told that I had an HR interview which at this point, I knew I was most likely getting an offer as the HR interviewer skimmed through most of the questions, citing that I had answered her questions with my answers for her previous questions, lol. I got a phone call a week later with an offer and found the interview process to be rather harmless, if not suspiciously easy.