Designing a Reliable Wallet Engine: Event-Driven Architecture with Kafka and TypeScript

Short summary

Build fault-tolerant wallet engines using event-driven architecture: double-entry bookkeeping guarantees money is never created or destroyed, transactional outbox ensures reliable Kafka event delivery, and pessimistic locking prevents race conditions on concurrent transactions.

• •Double-entry bookkeeping ensures zero-sum invariant — money created always equals money destroyed
• •Transactional outbox pattern guarantees Kafka events are delivered exactly once, never lost
• •Pessimistic row-level locking serializes concurrent wallet operations safely without phantom reads

Generated with AI, which can make mistakes.