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Modern platforms (Reddit, LinkedIn, YouTube) support multiple reaction types per entity. Core Requirements β One user β one reaction per entity β ...
The Silent Cost Behind Fast Reads Indexes donβt make systems faster βthey shift cost from reads to writes, memory, and latency tails. π§ The...
π§ Real-World Scenario Youβre building a live podcast platform where: A host starts a live podcast session. Multiple guests are invited to...
We are designing a meeting scheduler with the following requirements: There are N rooms. We are given a stream of meeting requests (start time, end...
Problem: Parallel Parentheses Validator Description You are given a string s of length N consisting only of the characters '(' and ')'. A parentheses...
Asked in Phonepe interview. Design and implement a Paytm/PhonePe Wallet System that supports multiple concurrent users performing transactions at the...