Access Control System Design (RBAC vs ABAC)

System DesignRobinhoodLast reported January 2026Low Frequency
Reported
1× across candidate reports
First seen
January 2026
Last reported
January 2026
Reported outcome
unknown

Problem Overview

Design an internal permission and access control system for a security-engineering context. The discussion must cover: (1) the tradeoffs between Role-Based Access Control (RBAC) and Attribute-Based Access Control (ABAC) — when to use each and how to combine them; (2) applying the principle of least privilege; (3) how permission…

  • 5 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
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
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Interviewer Follow-ups
The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.
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