Expedia SDE-3 Gurgaon — 2 DSA + design WhatsApp + HM; offer

Status: Btech in CS from a tier-3 college
Location: Gurgaon
Experience: 5 years
Date : Sept/ Oct

Expedia Recruiter reached out to me directly.

Onsite Round 1 :
Expectations : (working code)
A data structures round. I was asked 3 questions.
1 based on LinkList,
2. sell and Buy stock(Leetcode),
3. max product subarray

Onsite Round 2 :
Expectations : (working code)
In another DS round. 2 questions were asked. I was able to answer both of them. Questions were mixed, related to graphs, trees, etc.

Onsite Round 3 :
I was asked to design a system like WhatsApp, discuss various approaches, LLD and HLD questions related to that.
Focused Area:

1. How message will transfer in group messaging and peer to peer as well,
   2 Database Schema : (Storing older message),
   3 Message retry for a particular user in a group chat,
   4 End to end encryption

Onsite Round 4 :
HM round. I was asked system design principles and a few behavioral questions.
Result: Passed the interview. The offer was given within a week.