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67 questions in the library. A source association does not guarantee a future interview question.
Behavioral and leadership · Coding · Machine learning · ML system design · System design
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Showing 1–25
Design a metrics aggregation system that collects count-based metrics (like user signups, system errors, ad clicks) from services via a client library and displays them…
Companies: Pinterest, Amazon, DoorDash, Google +10
Last reported Nov 2026
Design a system that allows merchants to create and manage product listings via single or bulk updates, while enabling regular users to browse and view…
Companies: Pinterest
Last reported Oct 2026
Given coin denominations available in unlimited quantity and a target amount, find the minimum number of coins needed to form that amount (return -1 if…
Companies: Pinterest, Amazon, Google, Uber
Array · Breadth-First Search · Complete Knapsack · Dynamic Programming
Last reported Oct 2026
Async processing with durable queues, per-channel isolation, retries/DLQ, at-least-once + idempotency, outbox, priorities.
Companies: Pinterest, Airbnb, Amazon, Autodesk +24
async-processing · idempotency · outbox-pattern · queues
Last reported Oct 2026
Given arrays of box heights and warehouse room heights, maximize how many boxes can be placed knowing a box can only reach a room if…
Companies: Pinterest
Array · Greedy · Sorting
Last reported Oct 2026
Given box sizes and a sequence of warehouse slot heights, maximize how many boxes can be placed into the slots under the constraint that a…
Companies: Pinterest
Last reported Oct 2026
Companies: Pinterest
System Design
Last reported Sep 2026
Given repeating bus routes and start/target stops, find the minimum number of bus rides required to go from source to target (or -1 if impossible)…
Companies: Pinterest, Amazon, Bloomberg, Coupang +3
Array · Breadth-First Search · Hash Table
Last reported Sep 2026
Given a list of directed flight tickets, reconstruct an itinerary starting at "JFK" that uses every ticket exactly once and, among all valid itineraries, returns…
Companies: Pinterest, Amazon, Anduril, Google
Array · Depth-First Search · Eulerian Circuit · Eulerian Path
Last reported Sep 2026
Companies: Pinterest
System Design · System Design Fundamentals
Last reported Sep 2026
Companies: Pinterest
System Design
Last reported Sep 2026
Algorithm trade-offs (fixed window, sliding log, sliding counter, token bucket), placement, distributed atomic counting, failure modes.
Companies: Pinterest, Amazon, Anthropic, Apple +14
api-gateway · atomicity · Concurrency · Consistency & Availability
Last reported Sep 2026
Companies: Pinterest
System Design
Last reported Sep 2026
Given a total amount of money and a number of people, distribute the money as evenly as possible among all people. Minimize the difference between…
Companies: Pinterest
Last reported Sep 2026
Given a route with N possible overnight stops and their cumulative travel times, determine the optimal placement of K overnight stops to minimize the longest…
Companies: Pinterest
Last reported Sep 2026
Determine whether ransomNote can be formed from magazine by verifying that for every character, magazine contains at least as many occurrences as needed — i.e.…
Companies: Pinterest, Anduril
Counting · Hash Table · String
Last reported Sep 2026
Given a numeric string S and an integer X, return a string representation of S rounded to X significant digits, with thousand separators applied where…
Companies: Pinterest, Google
Last reported Aug 2026
Design the personalized home feed for Pinterest, a visual discovery platform where users see recommended and followed content (pins) based on their interests, boards, and…
Companies: Pinterest
Last reported Aug 2026
Given a multiset of candidate numbers, return all unique combinations that sum to the target where each candidate may be used at most once. This…
Companies: Pinterest, Expedia, LinkedIn, Meta +1
Last reported Aug 2026
Given an m×n height grid where water can flow from a cell to any neighbor of lesser-or-equal height, return all coordinates from which water can…
Companies: Pinterest, Amazon, Merge, Meta
Last reported Aug 2026
Given a list of rectangular buildings [left, right, height], compute the skyline as the sequence of key points where the maximum building height changes across…
Companies: Pinterest, Amazon, General Motors
Last reported Aug 2026
Given a list of elevators, each with a current floor and direction, implement two methods: getElevator(userFloor, destinationFloor) that selects the best elevator to serve a…
Companies: Pinterest
Last reported Aug 2026
Given a source and target string, return the minimum number of subsequences of source that need to be concatenated to form target (or -1 if…
Companies: Pinterest
Binary Search · Greedy · String · Two Pointers
Last reported Aug 2026
Companies: Pinterest, Amazon, Capital One, Microsoft +2
Last reported Jul 2026
Companies: Pinterest
ML System Design
Last reported Jul 2026