•TOPIC

Payments System Design Case Studies

InterviewSkool tracks 11 Payments case studies with architecture diagrams, scale estimates, and deep dives.

Filter by company to see which companies ask Payments questions, or browse all case studies.

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Companies

Capital One4Meta3OpenAI3Bloomberg2Databricks2JPMorgan2Rippling2Salesforce2TikTok2Airbnb1Apple1Goldman Sachs1Microsoft1Uber1Visa1Walmart1

Topics

Distributed Systems 90Real-time 51Storage 43Data Pipelines 42API Design 41Databases 38Caching 37Security 32AI / ML 23Algorithms 20Scheduling 20Search 19Event Driven 14Fintech 14Payments 11Geospatial 11Analytics 11Observability 11E-commerce 11Messaging 10CDN 9Concurrency 8Ads 8Frontend 8Booking System 6Networking 5IoT 4Media 3Media Streaming 3Collaboration 3Rate Limiting 2
Payments✕Clear all
MakeMyTrip – Hotel Booking System
20 min readDistributed SystemsPaymentsBooking System
Beginner+3▶ Mock
BookMyShow
9 min readDistributed SystemsPaymentsBooking System
Beginner▶ Mock
Highly Reliable Account Balance System (Wallet / Ledger)
5 min readFintechPaymentsDatabases
Intermediate▶ Mock
Credit Card Authorization, Limits and Reporting
4 min readFintechPaymentsReal-time
Advanced▶ Mock
Digital Game Store and Distribution Platform (Steam)
6 min readE-commercePaymentsCDN
Intermediate▶ Mock
Preventing Duplicate Request Processing (Idempotency Keys)
4 min readAPI DesignDistributed SystemsPayments
Beginner▶ Mock
Mobile Banking App Backend
3 min readFintechSecurityPayments
Intermediate▶ Mock
Real-Time Online Auction (eBay / Live Auctions)
7 min readReal-timeDistributed SystemsPayments
Advanced▶ Mock
Payment Processing System (Stripe-style)
6 min readPaymentsFintechDistributed Systems
Advanced+1▶ Mock
Stock Trading Platform (Zerodha / Robinhood)
6 min readFintechPaymentsReal-time
Advanced▶ Mock
Virtual Credit Card Service (Capital One)
6 min readFintechPaymentsSecurity
Intermediate▶ Mock

Frequently Asked Questions

What is Payments in system design?

Payments is a core system design topic covered in 11 case studies on InterviewSkool. It appears frequently in FAANG interviews, especially at Google, Amazon, and Meta.

How should I prepare Payments for system design interviews?

Study the case studies above, focusing on architecture trade-offs, scale estimates, and API designs. Practice explaining your decisions aloud — this is exactly what interviewers evaluate.

Practice with a Mock Interview

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