Fintech & Commerce
Design a Digital Wallet (Venmo/CashApp)
A peer-to-peer balance-transfer platform requiring strongly-consistent balance updates and a social activity feed layered on top.
Open and Simulate this Architecture in InfraDraftCore Architectural Components
Account Balance Ledger
Strongly-consistent record of every account's current balance.
P2P Transfer Transaction Engine
Atomically debits one account and credits another.
Idempotency Key Store
Prevents a retried transfer from moving money twice.
Bank/Card Linking & Funding Source Service
Manages external accounts used to top up or cash out.
Social Activity Feed Service
Publishes (optionally public) transaction activity to a feed.
Fraud Detection Integration
Screens transfers for account-takeover and scam patterns.
Notification Service
Confirms sends/receives in real time.