WhatsApp Interview Questions & Reviews
Getting an Interview
Software Engineer Interview (Neutral Experience; Average Interview)
I applied online and interviewed at WhatsApp.
Interview Details – After you send your resume, you will get a email to do some coding and send back the result in 1 hour. The question is about sorted linked list merge and merge sort linked list. After that you might have 1~2 Skype interview. Each one you should answer 2 coding question and discuss your background. For me the coding question are convert sorted linked list to BST, recover the linked list which has loop in it, regular expression for IP, array implementation of queue. Nothing to tricky. After that I went to the onsite interview. And I meet 8 people that day, including 2 co founders. The question are in a very wild range that you cannot expected. Compression Unicode, UDP TCP comparison, Linux kernel .... I realize there might now be NCG position, unless you are a rockstar. GGGL.
Interview Question – Operating system knowledge, Linux, Network protocol and etc. View Answer
Blackberry/Windows Mobile Dev Intern Interview (Neutral Experience; Easy Interview)
I interviewed at WhatsApp in April 2013.
Interview Details – It was a phone interview while online coding was not used at the same time. There were no hard questions. Just some general questions about array, AVL trees and hashtables, basically why each data structure is used under certain circumstances and running times of important funcitons. Difference between UDP and TCP.
Interview Question – I was asked to find out what their website's port number is. View Answer
Mobile Dev Intern Interview (Neutral Experience)
Interviewed at WhatsApp
Interview Details – The interviewer was rude and terse. I had the feeling that we were both wasting our times. The interviewer was not helpful, asking vague questions and disliking all my answers. When I described a project I was working on, he straight up dismissed it as useless. For Pete's sake, I was a freshman!
Interview Question – Why would I want to use your app? Answer Question
Android Developer Interview (Negative Experience; Average Interview)
I applied online and the process took 3+ weeks - interviewed at WhatsApp in January 2013.
Interview Details – 30 min phone interview was excellent. I was invited for an onsite interview for 2 hours I met three interviewers. First one was 45mins and we centered around Queue implementation. I think I got a blackout I did couple terrible mistakes. Second one was 30 minutes, interesting questions about how to design cache. Last one was 45 minute, I had to implement LRU cache (I did it well). Recruiter was unfriendly and dodn`t showed any respect to a candidate.
Interview Question – LRU cache, Queue Answer Question
Android Developer Interview (Neutral Experience; Average Interview)
The process took a day - interviewed at WhatsApp in July 2011.
Interview Details – This is a YouWeb company. Company has a good product and very promising future.
The interview process start with a phone screening which is pretty common, then they have you onsite pretty soon.
In the one day onsite interview, you will need to talk with every ENG there. (it's 4~5 people.) Most of the time you orally answer the question or write some sudo code on the white board. Only one guy will ask you to finish a programming test on machine.
Most of the guy seems to be easy to work with. However, when comes to the offer, it's much lower then I expect and they didn't want to spend time to negotiate with you, just keep telling you this is the only startup that will have a big success and if you go somewhere else, it won't be any better and you are making the wrong decision. Because of that, I feel like these are not the people I would like to work with and I go somewhere else.
Interview Question – String reverse. Tree(data structure) related question. View Answer
Software Intern Interview (Positive Experience; Average Interview)
I applied online and the process took a day - interviewed at WhatsApp in January 2011.
Interview Details – Nice interview - went over my resume - talked about server / C programming. Talked about their product a lot and tried to judge what I could do for the company. talked about my prjects - malloc / proxy . Socket programming.
Interview Question – What is the comparison between hashmap and a tree Answer Question