Recruiter connected with me through LinkedIn and Scheduled 2 rounds of interview back to back. Each round of 1 hour.

Round 1:

Asked about current project and it's error handling/exception handling.
then he moved on system design questions:
Design Car Parking Lot.

I came up with design and he asked few more questions on design. He was not more open with his requirements for system. So I was confused and lead to whatever I have studied in Design.

He seems to be unhappy in interview but he did asked followed up questions and I was able to answer it not sure what exactly he was looking for.

Round 2:

In this round, interviewer was friendly. Thankfully!
He directly jumped on coding questions.

1. Given a BST and we have to find Kth smallest element from it.
   - Solved with Inorder Traversal and he asked me to write code. I wrote code quickly and he came up with follow up question. I was able to answer them as well.

2. Given an array which includes elements in pair find out single element from array.
   - eg. [2,1,3,3,1,5,2] output : 5 and 5 is single element with no pair
   Solved using XOR bit manipulation. It took me sometime to come up with Bit Manipulation solution but then I was able to do it and code as well

3. This question was similar to Valid Parenthesis in LC and there was only 10 minutes left to solve this. So he asked me to explain approach first, he seems to be satisfied with approach so didn't asked me to code it out.

After 2 weeks I called HR for follow up and he said I got -ve for system design round.

It was good learning for me and I enjoyed crisp and sorted hiring process of Grab.

P.S : Sorry for bad english