I applied online. The process took 3 weeks. I interviewed at Stack Overflow (Remote, OR) in May 2015
Interview
The interview process started with a non-technical background screening by a recruiter over the phone that took about 30 minutes. This was followed by a three-question technical screening interview that took about 15 minutes.
After passing the background screening and technical screening, I had to send several messages to the recruiter before they finally responded to schedule two more full technical interviews.
The first full technical interview was a practical “design this simple application” test. The second interview was an “algorithms puzzlers” interview like what Google famously gives to its applicants. As such, I would recommend that anyone who wants a job at Stack Exchange should do what Google tells their applicants to do: read a book on data algorithms before you interview.
All of the technical interviews, including the screening interview, were conducted with video using Google Hangouts. Code was written in a Google Docs document. Use of an actual code editor or compiler/interpreter was forbidden.
When questioned the interviewers about what specific projects I could be expected to work on if I were to join the company, I was never given a clear answer. I was told during the background interview that they were looking for people to work on the core Stack Exchange product and on Stack Exchange Careers, but the final interview they gave me was with someone that was part of some analytics team and did not know anything about what those other groups were doing.
During the process I did not get the impression that the technical interviewers had taken time to review any information about me before the interviews, as I had to re-explain who I was and what I had done both times.
After my application was rejected, the recruiter did not respond to any follow-ups.
(Note: This interview was conducted 100% remotely, but Glassdoor does not currently allow interviews to be submitted without a city name.)
Interview questions [1]
Question 1
Write an algorithm that is efficient for millions of items that creates a new set C containing an intersection of the items in sets A and B.
I applied online. The process took 1+ week. I interviewed at Stack Overflow (New York, NY) in Jun 2018
Interview
Be ready for a gauntlet. The entire process was 6 or 7 interviews, each with a different theme. Very transparent through the process. Didn’t hear back for a few months after applying.
1) “Easy” algorithms interview
2) Phone screen with HR
3) “Hard” algorithms interview
4) Architecture interview
5) Business / Product interview
6) Hiring manager interview (not always)
7) Final interview
Made it to the “hard” algorithms interview. Overall a good experience, good people. Seemed like in both of my “technical” interviews, the guys didn’t read anything from my application or prepare much going in.
Code screen questions over Google docs, probably need a better tool in that space. Overall the interviews were easy and I felt good coming out of them. HR gets back quickly after each round (a day or so), which is nice.
Overall pretty easy, I probably prepared too much for the questions they ended up asking and got in my own head quite a bit (overthinking).
Interview questions [3]
Question 1
“Easy” Interview: Write an algorithm to perform Run-Length Encoding in your preferred language.