Multiplayer Game Matching System Design

System DesignRobloxLast reported April 2026Medium Frequency
Reported
8× across candidate reports
First seen
July 2025
Last reported
April 2026
Reported outcome
mixed

Problem Overview

Design a matchmaking service for a multiplayer gaming platform (e.g., Roblox) with approximately 1M DAU across many different games. When a user selects a game to join, they enter a waiting room/queue. The system must match users based on skill level (retrievable via an external API returning a score 0–100)…

  • 6 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
  • The rest of the problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
Unlock the full Roblox catalog
Full problem statements, candidate-reported follow-ups, and walkthroughs — for every Roblox question.
Unlock with Pro
Already a member? Sign in
Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.
Is this helpful?