Design Notification System

System DesignRobloxLast reported June 2026Low Frequency
Reported
2× across candidate reports
First seen
August 2025
Last reported
June 2026
Reported outcome
unknown

Problem Overview

Design a real-time notification system from a frontend (and partial backend) perspective. Users should receive notifications triggered by action items such as: password expiry requiring a change, friends posting activity, address needing an update, etc. Key requirements: (1) an unread notification count badge visible at all times, (2) a main…

  • 4 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?