TOPIC

Payments System Design Case Studies

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

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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
PaymentsClear 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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