Skip to content

Explore

Questions Companies Concepts Guides Sign in

How it works Questions Companies Concepts Guides Pricing Sample scorecard

Interview questions

Find a company or topic. Read the sources, then practice.

Coding study plans Companies Design mock

Loading the question library…

Practice system design interviews out loud with an AI interviewer, a shared whiteboard and a scorecard for your level.

How it works Questions Concepts Questions by company Comparisons Technologies Guides Cheat sheet Sample scorecard FAQ Use it as an app Sign in Pricing About and how we write Terms and guidelines Privacy Policy Contact

© 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.

Interview questions by company and topic | SysRound

Search questions

CompanyType a name, then choose a company from the suggestions.

Question type

Difficulty

TopicType a topic, then choose one from the suggestions.

30 questions

Showing 1–25

Practical engineeringHard
Same-Hostname Web Crawler: Single-Threaded, Then Multithreaded
Companies: Anthropic
Concurrency · Graphs
Last reported Oct 2026
Open workspace
Practical engineeringHard
Fault-Tolerant Task Queue with Retries, a Dead-Letter Queue and Task Dependencies
Companies: OpenAI
Data Structure Design · Graphs
Last reported Oct 2026
Open workspace
Practical engineeringHard
Fault-Tolerant Task Queue with Retry Cooldowns, a Dead-Letter Queue and Dependencies
Companies: OpenAI
Data Structure Design · Graphs
Last reported Oct 2026

Page 1 of 2

Practical engineeringMedium

Social Graph with Follow/Unfollow, Snapshots, History Queries and Recommendations

Companies: OpenAI

Data Structure Design · Graphs

Last reported Oct 2026

CodingHard

Follow One-Way Links to the Endpoint Node or the Last Node Before a Loop Closes

Companies: OpenAI

Graphs

Last reported Oct 2026

Practical engineeringMedium

Make a Web Crawler Concurrent with Thread-Safe Visited State

Companies: Anthropic

Concurrency · Graphs

Last reported Oct 2026

CodingHard

Count Ordered Four-Shop Road Paths That Visit One Shop of Each Type

Companies: OpenAI

Graphs

Last reported Oct 2026

System designMedium

Design a Version-Aware Package Download Service That Fetches Missing Dependencies

Companies: NVIDIA

Graphs · System Design · System Design Fundamentals

Last reported Oct 2026

Practical engineeringMedium

Spreadsheet engine with setCell/getCell, cell references, and cycle detection

Companies: OpenAI

Data Structure Design · Graphs

Last reported Sep 2026

Practical engineeringHard

Follow Graph with Cheap Snapshots and Top-K Follow Recommendations

Companies: OpenAI

Data Structure Design · Graphs

Last reported Sep 2026

Practical engineeringHard

Plant Infection Grid Simulation: Days to Stabilize, Immune Plants, Expiring Immunity

Companies: OpenAI

Graphs · Grids & Matrices

Last reported Sep 2026

Practical engineeringMedium

Same-Host Web Crawler: Single-Threaded, Then Concurrent with a Thread-Safe Visited Set

Companies: Anthropic

Concurrency · Graphs

Last reported Sep 2026

CodingMedium

Order Tasks with Dependencies Using a Deterministic Topological Sort

Companies: OpenAI

Graphs · Heaps & Priority Queues

Last reported Sep 2026

ML system designMedium

Recommend Connections Through Mutual Friends and Evaluate the Ranking

Companies: Fireworks

Graphs · ML System Design · Recommendation Systems

Last reported Sep 2026

CodingMedium

Days Until an Infection Spreads to Everyone on a Grid

Companies: OpenAI

Graphs · Grids & Matrices

Last reported Sep 2026

Practical engineeringMedium

Make a Hostname-Limited Crawler Concurrent

Companies: Anthropic

Concurrency · Graphs

Last reported Sep 2026

CodingMedium

Implement Follow Graph with Snapshots and Recommendations

Design and implement a social follow graph that supports snapshotting the state of relationships at a given point in time and generating friend/follow recommendations based…

Companies: OpenAI

Data Structure Design · Graphs

Last reported Sep 2026

CodingMedium

Return the Lexicographically Smallest Topological Order

Companies: OpenAI

Graphs · Heaps & Priority Queues

Last reported Aug 2026

Practical engineeringMedium

Clarify and Design Social-Graph Milestones

Companies: OpenAI

Data Structure Design · Graphs

Last reported Jul 2026

CodingMedium

Count Connected Friend Groups

Companies: OpenAI

Graphs

Last reported Jul 2026

System designMedium

Match Tagged Problems to Skilled Programmers at Scale

Companies: Google

Graphs · System Design

Last reported Jun 2026

CodingMedium

Implement Social Graph Snapshot Queries

Companies: OpenAI

Data Structure Design · Graphs

Last reported Apr 2026

CodingMedium

Simulate Plant Infection Spread

Companies: OpenAI

Graphs · Grids & Matrices

Last reported Apr 2026

CodingMedium

Implement a web crawler using a provided API

Companies: Anthropic

Graphs

Last reported Feb 2026

CodingHard

Crawl Same-Domain Links

Companies: Anthropic

Graphs

Last reported Jan 2026