I applied through a recruiter. The process took 4 weeks. I interviewed at Roblox (San Mateo, CA) in Apr 2019
Interview
Recruiter reached out to me and set up a call with the director of this team.
I had a good discussion and we moved on to a take home assignment.
After a couple of iterations, I was OK'd and was invited on site.
There would be 7 rounds in total each 40-45 minutes. The team was fantastic to talk to. I loved having "productive discussions" rather being an anxious interviewee sitting on the opposite end of the table dodging fires ! Loved all the traditional networking, multi threading, data structures and algorithm challenges. I did pretty well on most of them except for a couple of rounds. I knew I wouldn't make the cut. It was fine, I could get better and I definitely will one day ! I had a small ray of hope that I would still get the offer since the director had liked my solution from the take home and he did find some of my background and projects impressive and felt I could fit in well. Maybe some another day !
Interview questions [1]
Question 1
Take home question -
>> Design and implement a UDP client-server application which takes in strings from a file and would send it to the server. The server will discard the longest 10% of the strings
On site Qs
1> Write a circular buffer using FIFO queue
2> Given a dictionary {"cat", "dog"} and an input src string, check if the src string can be formed as a concatenation of the strings in the dictionary
check the case of {"ca", "cat", "dog", "cadog"} for "catdog" etc
3> Given a list of Left and Right shoe size arrays, return the count of mismatched shoes
left = {3, 5, 7, 9} right = {5, 7, 5, 9}
4> Producer consumer problem with q.push(i) 100 times in the main() and 2 threads t1 and t2 to pop from the queue and print the values in parallel (no strict order)
Thank you for your thorough review of the interview process. We appreciate your hard work, enthusiasm, and positive energy - and do hope you'll apply again!
Other Senior Software Engineer interview reviews for Roblox
Reach out by recruiter, set up phone screen interview. 60 min coding interview. A leetcode style question with 3 follow up , overall experience is good got reject 2 weeks afterward.
The phone screen was surprisingly technical and lasted about 45 minutes, diving straight into system design. I was asked to design a leaderboard service, which caught me off guard at first. But as I started to outline my approach, I realized it was similar to a challenge I’d practiced on prachub.com just days before. The subsequent technical rounds were intense, focusing on DSA problems and scalability issues. In the end, I got an offer that I happily accepted, despite the difficulties I faced throughout the process.
Interview questions [1]
Question 1
Design a leaderboard service that supports tens of millions of concurrent players. Cover top-K queries, neighbor-rank queries, partial sharding, and consistency tradeoffs.
Reached out by HR and chatted with a hiring manager. Mostly Behavioral questions such as why you want to work at roblox. The conversation was great and smooth. But they rejected me after a few days.
