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31 questions in the library. A source association does not guarantee a future interview question.
Behavioral and leadership · Coding · Machine learning · ML system design · Practical engineering · System design
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Showing 1–25
Design a flight price monitoring system that allows users to subscribe to specific routes and receive email notifications within 10 minutes when flight prices drop…
Companies: Datadog, Google
Last reported Sep 2026
A PR replacing a synchronous processor with a batched processor fails to fall back to the synchronous processor if the batched processor cannot be created…
Companies: Datadog
Last reported Sep 2026
Design a cloud-based personal finance tracker that allows users to connect their bank accounts, automatically categorize transactions into expense types (food, rent, transport…
Companies: Datadog
Last reported Sep 2026
Design a lightweight, continuously running host agent that collects system metrics at regular intervals, including CPU, memory, disk utilization, open file descriptors, and…
Companies: Datadog
Last reported Aug 2026
Photo delivery and social feeds: safe publication, celebrity fan-out, stable pagination, and high-volume interactions.
Companies: Datadog, Amazon, Bloomberg, DoorDash +9
content-delivery · feed-fanout · idempotency · media-storage
Last reported Aug 2026
Given a set of filter parameters and a collection of log lines, implement a parser that matches log entries against the provided filters. Return all…
Companies: Datadog
Last reported Aug 2026
Design an AI-powered coding agent that can autonomously understand programming tasks, write and debug code, and iteratively refine solutions based on feedback or test results.
Companies: Datadog
Last reported Aug 2026
Design an in-memory hierarchical file system that supports path parsing and operations like mkdir, ls, addContentToFile (append/create), and readContentFromFile, requiring you…
Companies: Datadog, Anchorage Digital, Capital One, Coupang +5
Design · Hash Table · Sorting · String
Last reported Aug 2026
Design a video streaming platform like YouTube where creators can upload and share videos, viewers can stream content on-demand, and users receive personalized recommendations…
Companies: Datadog, Amazon, Axon, Geico +4
Last reported Jul 2026
Companies: Datadog, Amazon, Meta
Last reported Jul 2026
Companies: Datadog, Airbnb, Amazon, Anduril +22
Project Deep Dive
Last reported Jul 2026
Design a personal finance and budgeting system that allows users to track income and expenses, set spending limits across categories, and gain insights into their…
Companies: Datadog
Last reported Jul 2026
Review a ~70-line merge request of varying complexity and decide whether you would approve it. Identify both obvious and subtle issues that should be addressed…
Companies: Datadog, JPMorgan Chase
Last reported Jul 2026
The interviewer focused on a conflict that comes from different perspectives or ideas on how to execute a certain task.
Companies: Datadog, Adyen, Amazon, Capital One +18
Last reported Jul 2026
Companies: Datadog
ML System Design
Last reported Jun 2026
Walk through one or two projects you are proud of, discussing the overall design and key challenges faced. What tradeoffs were made and how did…
Companies: Datadog, Asana
Last reported Mar 2026
Design and implement an inverted index data structure that maps each unique word to a list of documents or positions where it appears. The solution…
Companies: Datadog, Confluent
Last reported Oct 2025
Companies: Datadog
ML System Design · System Design Fundamentals
Last reported Sep 2025
Companies: Datadog, Adyen, Airbnb, Amazon +31
Last reported Jul 2025
Given a flights graph and a matrix of vacation days per city per week, start at city 0 and choose each week whether to stay…
Companies: Datadog, Apple, Meta
Last reported Apr 2025
Companies: Datadog, Airbnb, Amazon, Anthropic +14
Last reported Apr 2025
Companies: Datadog, Adyen, Amazon, Anthropic +37
Last reported Apr 2025
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: Datadog, Amazon, DoorDash, Expedia +4
Binary Tree · Depth-First Search · DP on Trees · Dynamic Programming
Last reported Mar 2025
Companies: Datadog, Amazon, Atlassian, Confluent +9
Last reported Feb 2025
Companies: Datadog, Amazon, Automata, DoorDash +6
Last reported Feb 2025