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198 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 · Practical engineering · System design
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Showing 1–25
Design a metrics monitoring platform that collects performance data (CPU, memory, throughput) from hundreds of thousands of servers, allows users to set threshold-based alerts…
Companies: LinkedIn, Amazon, Databricks, Digitalocean +10
Last reported Oct 2026
Given n people labeled 0 to n-1 and an API knows(a, b) that returns true if person a knows person b, find the celebrity —…
Companies: LinkedIn, HubSpot
Last reported Oct 2026
ML System Design
Last reported Oct 2026
Given a nested list of integers, compute the sum where each integer is weighted by the reverse of its depth (elements deeper in the nesting…
Companies: LinkedIn, Meta
Breadth-First Search · Depth-First Search · Stack
Last reported Oct 2026
Companies: LinkedIn
ML System Design
Last reported Oct 2026
Find the shortest path (degree of separation) between two user profiles in a social network graph. How do you handle the search space explosion caused…
Companies: LinkedIn
Last reported Oct 2026
Design a recommendation system that analyzes user preferences and behavior to suggest relevant content, products, or services with personalized rankings and filtering capabilities.
Companies: LinkedIn, Disney, Goldman Sachs, Meta +1
Last reported Oct 2026
Implement an LZ78-style dictionary compression algorithm that encodes a string into compressed mapping tuples. Using the generated dictionary, decompress the encoded tuples…
Companies: LinkedIn
Last reported Oct 2026
Implement an LRUCache that supports O(1) average-time get(key) returning the value or -1 and put(key, value) which inserts or updates a key and, if capacity…
Companies: LinkedIn, Adobe, Amazon, Anthropic +29
Data Structure Design · Design · Doubly-Linked List · Hash Table
Last reported Oct 2026
Companies: LinkedIn
Recommendation Systems · System Design
Last reported Oct 2026
Companies: LinkedIn
ML System Design
Last reported Oct 2026
Local-time recurrence, bounded free/busy queries, invitation state, and reminders that remain correct when schedules change.
Companies: LinkedIn, Amazon, Apple, Google +3
event-driven · idempotency · recurrence · scheduling
Last reported Oct 2026
Design a typeahead search system that displays real-time search suggestions as users type their queries. The system should focus on the retrieval and display of…
Companies: LinkedIn, Databricks, Expedia, Google +3
System Design
Last reported Oct 2026
Design a stack data structure that supports standard push, pop, and top operations, along with a getMax operation that retrieves (but does not remove) the…
Companies: LinkedIn, Confluent, Everpure, Walmart Labs
Design · Doubly-Linked List · Linked List · Ordered Set
Last reported Oct 2026
Given a list of words, design a class that can answer repeated queries returning the minimum index distance between two given words; optimize for many…
Companies: LinkedIn
Array · Design · Hash Table · String
Last reported Oct 2026
Given an array of daily stock prices, compute the maximum profit achievable from exactly one buy-before-sell transaction (i.e., the largest prices[j] - prices[i] with j…
Companies: LinkedIn, Adobe, Amazon, Apple +10
Array · Dynamic Programming
Last reported Sep 2026
Given a binary array representing a flowerbed (0 = empty, 1 = planted) with no adjacent 1s, determine if you can add n new flowers…
Companies: LinkedIn, Meta
Array · Greedy
Last reported Sep 2026
Design a high-throughput malicious IP detection service that screens 100,000 requests per second against an internal IP reputation system, ensuring malicious callers are…
Companies: LinkedIn
Last reported Sep 2026
Design a distributed key-value store that supports persistent storage with append-only file operations, handles both read-heavy and write-heavy workloads with strong…
Companies: LinkedIn, Aibnb, Airbnb, Databricks +4
System Design
Last reported Sep 2026
Find the maximum length of a contiguous subarray that can be made all 1s by flipping at most k zeros — equivalently, find the longest…
Companies: LinkedIn, Amazon, D. E. Shaw, Meta
Array · Binary Search · Prefix Sum · Sliding Window
Last reported Sep 2026
Companies: LinkedIn
System Design
Last reported Sep 2026
Companies: LinkedIn
Observability · System Design · System Design Fundamentals
Last reported Sep 2026
Companies: LinkedIn
System Design
Last reported Sep 2026
Design a social media post search system that allows users to create posts and search through existing posts using boolean operators (AND/OR) without relying on…
Companies: LinkedIn, Amazon, Meta
Last reported Sep 2026
Companies: LinkedIn, Amazon, Automata, Google
Last reported Sep 2026