Customer Revenue / Referral System

CodingDatabricksLast reported August 2026High Frequency
Reported
13× across candidate reports
First seen
February 2025
Last reported
August 2026
Reported outcome
mixed

Problem Overview

Design and implement a customer revenue tracking system with the following operations: 1. insert(revenue: int) -> int: Add a new customer with the given revenue and return an auto-incrementing customer ID (starting from 0). 2. insert(revenue: int, referrer: int) -> int: Add a new customer referred by the given referrer…

  • 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
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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.
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