OA :
Related to Critical Connections
Number of Islands

Telephonic :
LP Questions
Serialize and Deserialize a Binary tree

Virtual Onsite :
Round 1 - LP questions(20 mins) and one medium leetcode question

Round 2 - LP questions(30 mins) and System Design

Round 3 - LP questions(20 mins) and Related to Binary tree

Round 4 - LP questions(15 mins) and Two coding questions one is easy(Binary Tree) and the other is Hard(Related to Trie)