Loading…
Explore questions associated with Whatnot. Review the source details, then use the workspace for code, notes, and diagrams.
10 questions in the library. A source association does not guarantee a future interview question.
Coding · System design
Loading questions…
Practice system design interviews out loud with an AI interviewer, a shared whiteboard and a scorecard for your level.
© 2026 SysRound. SysRound is an AI practice tool. The AI interviewer and the AI feedback can be wrong. Use it for your own practice, not to hire people.
Showing 1–10
Companies: Whatnot
System Design
Last reported Nov 2026
Design a short-term (24-48 hour) donations website where users can contribute to pre-selected charities, with focus on payment processing, failure handling, and backup payment…
Companies: Whatnot, DoorDash, Lyft
Last reported Nov 2026
Design an online programming judge system for coding competitions where users can submit solutions to algorithmic problems, get real-time feedback on code execution, and…
Companies: Whatnot, Amazon, LinkedIn, Lyft +4
Last reported Sep 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: Whatnot, Amazon, Bloomberg, Google +3
Data Stream · Design · Hash Table
Last reported Sep 2026
Given a lowercase string, repeatedly remove any two equal adjacent characters until no more removals are possible and return the resulting (unique) string. Solve in…
Companies: Whatnot, Goldman Sachs, Meta
Last reported Sep 2026
Given a string s and integer k, repeatedly remove any run of k equal adjacent characters until no more removals are possible and return the…
Companies: Whatnot, Amazon, Apple, Meta +2
Stack · String
Last reported Sep 2026
Given an undirected graph (n up to 2×10^5) as an edge list, determine whether there exists any path between the given source and destination vertices…
Companies: Whatnot, Meta, Microsoft
Last reported Sep 2026
Companies: Whatnot
Observability · System Design
Last reported Aug 2026
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: Whatnot, Addepar, Airbnb, Airwallex +22
System Design
Last reported Apr 2026
Determine whether a target word can be formed by a path of horizontally or vertically adjacent cells in an m×n letter grid without reusing a…
Companies: Whatnot, Amazon, Glean, Google +3
Array · Backtracking · Depth-First Search · Matrix
Last reported Feb 2025