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Fintech System Design Case Studies

InterviewSkool tracks 14 Fintech case studies with architecture diagrams, scale estimates, and deep dives.

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

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Companies

Capital One5Bloomberg3Goldman Sachs2JPMorgan2Rippling2Uber2Amazon1Databricks1OpenAI1Salesforce1Visa1

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
Fintech✕Clear all
Highly Reliable Account Balance System (Wallet / Ledger)
5 min readFintechPaymentsDatabases
Intermediate▶ Mock
Credit Card Authorization, Limits and Reporting
4 min readFintechPaymentsReal-time
Advanced▶ Mock
Credit Card Customer Portal
5 min readFintechSecurityAPI Design
Beginner▶ Mock
Entitlement-Aware Agentic Workflow for Portfolio Requests
4 min readAI / MLFintechSecurity
Advanced▶ Mock
Expense Policy and Violation Processing (Rippling)
5 min readFintechDistributed SystemsEvent Driven
Advanced▶ Mock
Low-Latency Holiday Lookup Service
4 min readCachingAPI DesignFintech
Beginner▶ Mock
Real-Time Market Data Distribution and VWAP (Bloomberg)
5 min readFintechReal-timeDistributed Systems
Advanced▶ Mock
Mobile Banking App Backend
3 min readFintechSecurityPayments
Intermediate▶ Mock
Personal Finance Dashboard from Multiple Providers
3 min readFintechAPI DesignCaching
Intermediate▶ Mock
Payment Processing System (Stripe-style)
6 min readPaymentsFintechDistributed Systems
Advanced+1▶ Mock
Portfolio Management System (HLD + DB Design)
3 min readFintechDatabasesAnalytics
Intermediate▶ Mock
Stock Price Alert System
3 min readFintechReal-timeAlgorithms
Intermediate▶ 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 Fintech in system design?

Fintech is a core system design topic covered in 14 case studies on InterviewSkool. It appears frequently in FAANG interviews, especially at Google, Amazon, and Meta.

How should I prepare Fintech 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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