System Design: Calendar Application

System DesignOpenAILast reported February 2026Low Frequency
Reported
3× across candidate reports
First seen
October 2025
Last reported
February 2026
Reported outcome
mixed

Problem Overview

Design a calendar application similar to Apple Calendar or Google Calendar. Users should be able to create, view, and manage events. The system must support three views: day view, month view, and year view. Follow-up: Support multi-device synchronization…

  • 2 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 OpenAI catalog
Full problem statements, candidate-reported follow-ups, and walkthroughs — for every OpenAI 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?