Top 50 api design Interview Questions
The most frequently asked api design questions across all roles and companies, ranked by real interview frequency. Updated daily.
Implement a deterministic key-value API with constant-time updates, lookups, deletion, and insertion-ordered listing.
MongoDBFind the longest substring without repeated characters using a hash map and sliding window.
WiseImplement API routing, validation, resource updates, and business-rule enforcement for an in-memory handler.
DoorDash USAImplement trie-based API route matching with static segments, parameters, and method-specific handlers.
PrizePicksGenerate the FizzBuzz sequence from 1 to n using recursion instead of loops.
PatternDesign a predictable pagination function that returns page items and metadata while handling empty and out-of-range inputs.
GoviniDesign asynchronous model submission and status endpoints with queued job state and dependency-free logic.
RipplingUse TDD to implement whitespace-tolerant word reversal while preserving each word's characters.
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