1st round 2 Leetcode easy question (stack and array) very basic if you can code your thought process some general question regarding past work 2nd round 2 Leetcode 1 easy 1 medium Easy i don't remember Medium - LRU cache leetcode LFU cache logic (which I couldn't tell correctly, but interviewer itself didn't know that much) 3rd round (with manager) 1 Puzzle, grilling on tech stack written on resume Other general question Singleton design pattern What is cache (redis etc) 2 times CAP theorem MongoDB & Cassandra in CAP theorem ACID properties TOTAL 4 QUESTION TO BE SOLVED ON LEETCODE, ALL TEST CASES SHOULD PASS