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Google's L3/L4 interviews are intensive: 4–6 rounds of DSA, system design, and Googleyness.
Find all subarrays with a given sum.
How to approach it
Prefix sum + hash map for O(n) solution.
Design Google Search.
How to approach it
Web crawlers, inverted index, PageRank, serving layer.
What is consistent hashing?
How to approach it
Virtual nodes on a ring — used in distributed caches.
Tell me about a time you handled ambiguity.
How to approach it
Googleyness — show you broke it down and moved forward.
Implement LRU cache.
How to approach it
HashMap + Doubly Linked List for O(1) get/put.
Our AI mock interviewer asks you these exact questions, listens to your spoken answer, and scores you on confidence, clarity, and technical accuracy — exactly like the real thing.