StumbleUpon Interview Questions
& Process

First, I had a phone call with HR to set up the interview date and time. Then, there was an hour-long phone interview. No coding was involved. The interviewer asked me questions based on my resume. The interview covered statistics, probability, data mining, and some graph theory. Many questions focused on the design and scalability of solutions for big data. The interview actually ran longer than planned, and the interviewer was still open to answering my questions about working at StumbleUpon. I got a call back with my interview feedback within a couple of weeks, and then received my offer letter about a week after that.

A recruiter reached out to me and scheduled a phone call with a team member. After that, they moved forward with an in-person interview. Since I couldn't travel, we did a Skype interview instead. I was supposed to meet six people but ended up talking to four team members from different levels. In the end, it didn't seem like a good fit for either side. I was surprised they'd offer me a job, but they also didn't send a rejection, even though the interview was two months ago. I finally emailed them and got a quick rejection.

Recruiter from LinkedIn reached out to me, and they wanted me to come in for a 5-hour in-person interview right away. I asked if we could do a phone interview first to see if we were both interested and qualified before I spent a whole day there. The phone interview was with another mobile engineer, and they asked me about my past jobs and my mobile development experience. It was a really nice chat. Since the phone call went well, the recruiter called me back to set up an in-person interview for the next week. The in-office interview involved meeting 5 different people for about an hour each. Two of them were engineers and had me do on-computer coding challenges. The other three were managers and asked more about my personal history and self-reflection. The coding challenges were pretty simple with my experience, nothing too crazy. They just tested basic UI setup, dev environments, regex, and delegate methods. A week later, they sent me a take-home coding challenge to build a small app that could do common things like user login (with email validation), Facebook login, submitting and reading data from a server using JSON, and handling asynchronous operations for a non-blocking UI. They liked my technical skills and extended an offer within a week.

Had a phone interview and some online coding tests. The onsite interview was really cool with fun coding puzzles and algorithms, and even games. It was conducted by really skilled engineers. The questions were better than what you usually see at other places.