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Pinterest Interview Question Bank

Pinterest's loop leans hard on a recurring custom prompt library — escape-room state-tracking, trie-backed access control, ads/log aggregation, splitwise-style settlement — over canonical LeetCode. ML system design is split into two distinct rounds ("ML Practitioner" and "ML System Design") that effectively cover the same recommender / retrieval / ranking surface from two angles, with embedding-heavy product framing throughout. Fully-remote, front-loaded compensation, and long team-match windows define the experience as much as the technical bar.

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Coding·60 min
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Escape Room / Room-by-Room Race

Design a small game-state data structure: `n` rooms and `m` players all start in room 0; each call advances one player to the next room. Support O(1) per-room headcount, O(1) per-player move, and a top-K leaderboard where farther rooms rank higher and arrival-order breaks ties within the same room. By far the most-recurring custom Pinterest coding prompt in the current rotation, asked at both phone and onsite.

SWE
MLE
data-structure
object-design
hashmap
linked-list
+3
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