Poshmark Data Engineer interview questions

Applied via Linkedin. Got call from HR in a week. * Round 1 (Skype- 1 hr.) : - Detailed discussion on background and the Android project I did, challenges faced and how to optimize modules - Group Anagrams together: n^3, then n^2lgn solutions - Any questions? * Round 2 (f2f 45 mins.): - Detailed discussion on background and Recommender system project - Why BST, Time Given a & space complexity questions; kth element from the end of the linked list; - Find next greater element in the array; - Any questions? * Round 3 (f2f 45 mins.): - Some discussion on background; Find the most frequent elements in the array (expected in O(N), not even O(2N)) - Any questions? * Round 4 (f2f 45 mins.): - Some discussion on background; Find the next greater permutation of same digits; - Any questions? * Round 5 (f2f 45 mins.): - Some discussion on my background; Given binary tree, from vertical view, print elements in order at each level (first told distance with bfs, then used map with dfs) ; - Given BST replace node data with sum of data of nodes greater than it (first used array, then optimized to in-place inorder traversal); - Any questions? * Round 6 (f2f 30 mins.): - With India head, detailed discussion on my background; Asked briefly about my projects; Some behavioural questions, then he explained about the company; *Round 7 (skype 50 mins.): - With Director of data engg. from US. Asked in detail about myself and previous projects and why I want to change to this job. Implement a dynamic array list using arrays. Can use any language, I did in Java. Then some casual discussion.

This interview was one of the worst experience I ever had which forced me to write a review about this company. The process began with the interviewer (director) explaining about Poshmark as a company and then about the team. Looks like they had a very small team. Then came a very standard question : Tell me something about yourself . Within a few seconds , he started counter questioning me about the technologies which I worked on . I kinda found it somewhat unprofessional since you (as an interviewer) are supposed to listen to the interviewee and then ask questions at the end. These things started going on and somehow it seemed to me that he was disinterested in knowing more about me . That was my gut feeling but still I went on and tried to explain him to the best of my knowledge. Then he asked one coding question (implement Arraylist using Array). I figured out that it was an easy question but somehow at that moment of time I couldn't figure out how to start and design the class. But somehow I started and did some coding on the coderpad. Now comes the worst part: The interviewer went on Mute and there was no communication from his side which made me feel that I am talking to walls . After a few minutes , the interviewer said that he is going to drop off the phone and let me complete the solution by myself. At that point of time , I felt so bad because if that was the case , why did he ask me a coding question on phone . He would have rather given me the Take away home test. I did not expect such a unprofessional conduct from a Director level person. Seems that he was just interested in the end solution and not the thought process. I really wish that team gets a robot ! haha Anyways I just took the interview today and I know I will be rejected so I don't care too much about it now.