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Explore questions associated with Expedia. Review the source details, then use the workspace for code, notes, and diagrams.
52 questions in the library. A source association does not guarantee a future interview question.
Behavioral and leadership · Coding · Machine learning · ML system design · Object-oriented design · System design
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Showing 1–25
Design a backend system for a customer support platform that allows 10,000 agents to manage and resolve tickets submitted by millions of users via email…
Companies: Expedia, Airbnb, Asurion, Walmart +1
Last reported Sep 2026
Given an integer array `nums`, return the number of index triplets `(i, j, k)` where `0 <= i < j < k < len(nums)` and…
Companies: Expedia
Last reported Sep 2026
Design an online multiplayer tic-tac-toe game that allows players to create or join game rooms, play against each other in real-time, and track game results.
Companies: Expedia, Dialpad, Remitly
Last reported Sep 2026
Design an AI agent that answers guest questions about hotel-related information such as pricing, room details, amenities, nearby attractions, and local weather, with a strong…
Companies: Expedia
Last reported Jun 2026
Find the maximum sum of any non-empty connected path in a binary tree (nodes used at most once), where the path can start and end…
Companies: Expedia, Amazon, Datadog, DoorDash +4
Binary Tree · Depth-First Search · DP on Trees · Dynamic Programming
Last reported Jun 2026
Given a list of intervals [x_start, x_end] (endpoints inclusive), find the minimum number of points on the x-axis (vertical arrows) such that each interval contains…
Companies: Expedia, Amazon, Atlassian, Google
Array · Greedy · Sorting
Last reported Jun 2026
Given an ascending array of distinct integers that has been rotated at an unknown pivot, return the index of a target value (or -1 if…
Companies: Expedia, Amazon, Google, LinkedIn +3
Array · Binary Search
Last reported Jun 2026
Design a stack data structure that supports standard push, pop, and top operations while also allowing retrieval of the minimum element in constant time (O(1)).
Companies: Expedia
Last reported Jun 2026
Given a string, generate all possible subsequences by deleting zero or more characters while keeping the original order of remaining characters. Return the list of…
Companies: Expedia
Last reported Jun 2026
Group the input strings into lists of anagrams — i.e., strings that contain the same multiset of letters — and return the groups in any…
Companies: Expedia, Amazon, Apple, Arize Ai +14
Array · Hash Table · Sorting · String
Last reported Jun 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: Expedia, Amazon, Apple, Google +3
Last reported Jun 2026
Given a Binary Search Tree and a target numeric value, return the value of the node in the tree that is closest to the target…
Companies: Expedia, Meta, Roblox
Binary Search · Binary Search Tree · Binary Tree · Depth-First Search
Last reported Jun 2026
Given distinct candidate integers and a target, return all unique order-insensitive combinations where each candidate may be used unlimited times and the numbers sum to…
Companies: Expedia
Last reported Jun 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: Expedia, LinkedIn, Meta, Microsoft +1
Last reported Jun 2026
Date-range inventory: atomic multi-night reservations, expiring holds, stale search results, and payment races.
Companies: Expedia, Airwallex, Amazon, Booking.com +10
concurrency · idempotency · inventory-management · payments
Last reported Jun 2026
Contention on scarce inventory: seat holds with TTL, locking/optimistic concurrency, payments, flash-sale traffic and virtual queues.
Companies: Expedia, Agoda, Airwallex, Amazon +15
concurrency · idempotency · load-shedding · locking
Last reported Jun 2026
Design a hotel booking platform similar to Expedia that allows users to search for and book accommodations at various hotels including chains like Hilton and…
Companies: Expedia, Lightspeed, Meta
Last reported Jun 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: Expedia, Databricks, Google, LinkedIn +3
System Design
Last reported Jun 2026
Given two arrays gas and cost around a circular route, find the unique starting station index from which you can travel clockwise once without your…
Companies: Expedia, Adobe, Bloomberg, Goldman Sachs +2
Array · Greedy
Last reported Jun 2026
Design a stack supporting push, pop, top, and getMin operations all in O(1) time. The core challenge is to maintain and update the current minimum…
Companies: Expedia, Snowflake
Design · Stack
Last reported Jun 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: Expedia, Adobe, Amazon, Anthropic +29
Data Structure Design · Design · Doubly-Linked List · Hash Table
Last reported May 2026
Design a price tracking and comparison platform that allows users to track product prices over time across multiple online retailers, set price drop alerts, and…
Companies: Expedia, Agoda, Meta
Last reported May 2026
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: Expedia, Amazon, Databricks, Digitalocean +10
Last reported May 2026
Design a checkout system for a local grocery store that allows cashiers and customers to process purchases, handle payments, and manage transactions reliably, including…
Companies: Expedia
Last reported Mar 2026
Design a travel recommendation system where users select a line of business (flights, hotels, or packages) and receive personalized trip bundle recommendations. Users who…
Companies: Expedia
Last reported Mar 2026