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187 questions in the library. A source association does not guarantee a future interview question.
Behavioral and leadership · Coding · Machine learning · ML system design · Other questions · System design
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Design a CI/CD pipeline system that can execute variable-length tasks organized in stages, where each deployment event triggers a sequence of tasks that must be…
Companies: Apple, OpenAI
Last reported Oct 2026
Ingest a publicly available "dump" file and return the sorted occurrences of a given string of text.
Companies: Apple
Last reported Oct 2026
Design a hit counter that records timestamps of hits and returns the number of hits in the past 5 minutes (300 seconds). The challenge is…
Companies: Apple, Adyen, Cisco, Databricks +5
Array · Binary Search · Data Stream · Design
Last reported Oct 2026
Given a list of intervals, merge all overlapping (including touching endpoints) intervals and return the minimal set of non-overlapping intervals that cover them. Key pattern…
Companies: Apple, Amazon, Antithesis, Atlassian +16
Array · Quicksort · Sorting
Last reported Oct 2026
Count the number of contiguous subarrays of positive integers whose product is strictly less than k. Because all nums > 0, this is a sliding-window/two-pointer…
Companies: Apple
Array · Binary Search · Prefix Sum · Sliding Window
Last reported Oct 2026
Return the words that can be typed using letters from only one row of a US QWERTY keyboard (case-insensitive), i.e., all characters of a word…
Companies: Apple
Last reported Sep 2026
Count the number of islands (4-directionally connected components of '1's) in an m×n binary grid. This is a connected-components/flood-fill problem typically solved with…
Companies: Apple, Amazon, Anduril, ByteDance +16
Array · Breadth-First Search · Depth-First Search · Matrix
Last reported Sep 2026
Companies: Apple, Atlassian, Bloomberg, Coursera +7
Last reported Sep 2026
Companies: Apple
API Design · System Design
Last reported Sep 2026
Companies: Apple
System Design
Last reported Sep 2026
Design a distributed job scheduler that can handle high-throughput job processing (10,000+ jobs per second), support both scheduled (cron-based) and ad-hoc job execution…
Companies: Apple, Airbnb, Autodesk, Bolt +25
System Design
Last reported Sep 2026
Design a mobile chat application that allows users to send text messages and share images in one-on-one conversations.
Companies: Apple, Meta
Last reported Sep 2026
Algorithm trade-offs (fixed window, sliding log, sliding counter, token bucket), placement, distributed atomic counting, failure modes.
Companies: Apple, Amazon, Anthropic, Freshworks +14
api-gateway · atomicity · Concurrency · Consistency & Availability
Last reported Sep 2026
Large file transfers with small metadata transactions: resumable uploads, offline conflicts, reliable change feeds, and shared subtrees whose permissions change as files move.
Companies: Apple, Amazon, Autodesk, Clio +17
access-control · change-data-capture · conflict-resolution · data-versioning
Last reported Sep 2026
Given an array of balloon values, find the maximum coins you can collect by bursting balloons optimally. When you burst balloon at index i, you…
Companies: Apple, Amazon, Google
Last reported Aug 2026
Companies: Apple
Real-Time Systems · System Design
Last reported Aug 2026
Companies: Apple
System Design · System Design Fundamentals
Last reported Aug 2026
Companies: Apple
ML System Design
Last reported Aug 2026
Companies: Apple
ML System Design
Last reported Aug 2026
Companies: Apple
System Design
Last reported Aug 2026
Companies: Apple
System Design
Last reported Aug 2026
Design a service built on top of a music platform like Apple Music that allows users to generate personalized playlists by providing natural language prompts…
Companies: Apple
Last reported Aug 2026
Design a distributed logging system that allows applications to send log messages, store them efficiently, and provide search and analytics capabilities for debugging and…
Companies: Apple, Amazon, Expedia, Google +3
Last reported Aug 2026
Return the index of the first character in s that occurs exactly once (or -1 if none). This is typically solved by counting character frequencies…
Companies: Apple, Goldman Sachs
Counting · Hash Table · Queue · String
Last reported Aug 2026
Design a time-based key-value store that records multiple values per key with timestamps and returns the value whose timestamp is the largest <= the queried…
Companies: Apple, Amazon, Anthropic, Citadel +8
Binary Search · Design · Hash Table · String
Last reported Jul 2026