Visa / Payment Network System Design

System DesignDatabricksLast reported January 2026Low Frequency

Reported: 3× across candidate reports
First seen: September 2025
Last reported: January 2026
Reported outcome: mixed

Problem Overview

Design the architecture for a Visa-scale payment network / payment gateway system. Key requirements and scope vary slightly by interviewer but generally include: 1. Core scope: Card validation and payment routing — given a card number, determine which bank endpoint to route the authorization request to. You are NOT required…

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

Unlock the full Databricks catalog

Full problem statements, candidate-reported follow-ups, and walkthroughs — for every Databricks 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.