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25 questions in the library. A source association does not guarantee a future interview question.
Coding · Practical engineering · System design
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Showing 1–25
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: MongoDB, Amazon, Antithesis, Apple +16
Array · Quicksort · Sorting
Last reported Oct 2026
Implement a rate limiter using a sliding window algorithm that tracks and limits the number of requests allowed within a given time window. Extend the…
Companies: MongoDB, Adobe, Amazon, Cloudflare +4
Last reported Aug 2026
Given numCourses and prerequisite pairs, return any ordering of courses that satisfies all prerequisites or an empty array if impossible — this is essentially computing…
Companies: MongoDB, Amazon, Anduril, Apple +11
Breadth-First Search · Depth-First Search · Graph Theory · Topological Sort
Last reported Jul 2026
Design a simplified stock trading platform that supports limit orders for buying and selling stocks, with basic portfolio tracking capabilities at small scale (100 writes…
Companies: MongoDB, Block, Coinbase, Coupang +7
System Design
Last reported Jul 2026
Design a system that allows users to collect, monitor, and analyze variations in metrics over time, including features like real-time tracking, anomaly detection, and trend…
Companies: MongoDB, Kaluza
Last reported Jul 2026
Review the provided repository implementing a job queue system with multiple consumers executing a standard set of jobs. Identify any issues and suggest improvements.
Companies: MongoDB
Last reported Jul 2026
Design a system that monitors the health of machines running various applications by tracking key metrics and automatically notifying users when anomalies are detected.
Companies: MongoDB, Amazon, Microsoft
Last reported Jun 2026
Implement a logger that decides whether to print a message at a given timestamp: return true if the message hasn't been printed in the last…
Companies: MongoDB, Amazon, Bloomberg, Google +3
Data Stream · Design · Hash Table
Last reported Jun 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: MongoDB, Amazon, Anthropic, Apple +8
Binary Search · Design · Hash Table · String
Last reported Jun 2026
Implement a rate limiting algorithm that accepts a unique key, a time period in seconds, and a maximum call count, and determines whether additional calls…
Companies: MongoDB, Bloomberg, Intuit, Microsoft
Last reported Apr 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: MongoDB, Amazon, Databricks, Digitalocean +10
Last reported Apr 2026
Design a data model for an online library system where users can browse books, make reservations, and leave reviews. You should consider scale and data…
Companies: MongoDB
Last reported Apr 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: MongoDB, Amazon, Apple, Autodesk +17
access-control · change-data-capture · conflict-resolution · data-versioning
Last reported Apr 2026
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: MongoDB, Amazon, DoorDash, Google +10
Last reported Mar 2026
Design a validator system for a Data Migration Service (DMS) that verifies whether events are correctly migrated from a Source system to a Target system…
Companies: MongoDB, Microsoft
Last reported Mar 2026
Design a video streaming platform like Netflix that supports video playback across multiple devices (mobile, web, smart TVs) with seamless resume functionality, subscription…
Companies: MongoDB, Amazon, Google, HubSpot +2
Last reported Dec 2025
A shared API entry point must enforce request policies, translate protocols, and isolate failures at high request rates.
Companies: MongoDB, Cisco
authentication · configuration-distribution · fault-isolation · protocol-translation
Last reported Nov 2025
Design a real-time messaging system like WhatsApp or Facebook Messenger that supports 1:1 and group conversations, message delivery status tracking, user presence features…
Companies: MongoDB, Addepar, Airbnb, Airwallex +22
System Design
Last reported Oct 2025
Shared vector documents with concurrent edits, component overrides, and responsive views at large document sizes.
Companies: MongoDB, Meta
document-structure · edit-durability · large-document-response · reconnects
Last reported Feb 2025
Assign dry operations on zero days so that no lake is rained on while already full: given a sequence where rains[i]>0 fills a lake and…
Companies: MongoDB
Array · Binary Search · Greedy · Hash Table
Given a total amount and number of children, allocate all money so each child gets at least $1 and nobody gets $4, and return the…
Companies: MongoDB
Greedy · Math
Find the length of the longest contiguous subarray whose maximum minus minimum is ≤ limit; the key challenge is maintaining the window's current min and…
Companies: MongoDB, Uber
Array · Heap (Priority Queue) · Monotonic Queue · Ordered Set
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: MongoDB, Adobe, Amazon, Anthropic +29
Data Structure Design · Design · Doubly-Linked List · Hash Table
Design a versioned array that supports point updates, taking snapshots (returning increasing snap_ids), and querying the value at an index for a given snap_id. The…
Companies: MongoDB, Amazon, Anduril, Apple
Array · Binary Search · Design · Hash Table
Given an array of integers and a target, return the indices of two distinct elements whose values sum to the target (exactly one valid solution…
Companies: MongoDB, Amazon, Apple, Bloomberg +13
Array · Hash Table