Roblox
41 questions · 23 coding · 18 design
Candy Crush Grid Matching and Gravity
Reported Dec 2025
Closest Binary Search Tree Value
Reported Dec 2025
Cursor-Based Pagination Over Sorted Logs
Reported Jan 2026
Dependency Ordering With Topological Sort
Reported Jan 2026
Design a Multi-Resource Resource Loader
Reported Jul 2025
Design a ROS-like Pub/Sub System
Reported Jul 2025
Design a URL Shortener
Reported Feb 2026 · Also asked at Amazon, Google +3
Design Collaborative To-Do List System
Reported Apr 2026
Design Delayed/Scheduled Payment System
Reported Apr 2026
Design Frontend Feed Status App
Reported Aug 2025
Design Game Dashboard Friend Activity and Counts
Reported Jan 2026
Design Game Page Social Proof
Reported Jun 2026
Design Instagram
Reported May 2026 · Also asked at Amazon, DoorDash +1
Design Like/Unlike/Favorite System
Reported Apr 2026
Design Multiplayer Game Matchmaking System
Reported Apr 2026
Design Roblox Release Deployment Workflow
Reported Jun 2025
Design Roblox Wallet
Reported Nov 2025
Design Search Autocomplete System
Reported Dec 2025 · Also asked at MongoDB, Pinterest
Find the Closest Palindrome
Reported Sep 2025
Fixed-Size Window Target Counting
Reported Apr 2026
Flatten Nested Array
Reported Jun 2025
Fraud Detection System
ML System Design · Reported Jul 2025 · Also asked at Amazon, DoorDash +4
Front-End System Design: Notification System
Reported Aug 2025
Frontend System Design: Photo Album App
Reported Sep 2025
Game Genre Classification
ML System Design · Reported Apr 2026
Grid Reachability With Jump/Walk Cells
Reported May 2025
Highest Earning Experience Tracker
Reported Mar 2026
Implement Trie (Prefix Tree)
Reported May 2025 · Also asked at MongoDB
Maximize Distance to Closest Person
Reported Sep 2025
Maximum Number of Balls in a Box
Reported Aug 2025
Meeting Rooms II
Reported Jan 2026 · Also asked at Atlassian, Snowflake +4
Merge Intervals
Reported Jan 2026 · Also asked at Amazon, Apple +9
Minimum Height Difference Between Distant Peaks
Reported Aug 2025
Most Frequent Function Call Stack
Reported Apr 2026
Most Frequently Called Function From Logs
Reported Apr 2026
Phone Battery Discharge Scheduling
Reported Aug 2025
Reach Endpoint With Obstacles
Reported Feb 2026
Recommendation / Ranking System
ML System Design · Reported Jan 2026 · Also asked at Airbnb, Amazon +4
Remove Prefix Strings
Reported Sep 2025
Single-Threaded CPU
Reported May 2025 · Also asked at DoorDash
Sliding-Window Rate Limiter
Reported May 2026