double-ledger

A hands-on distributed-systems project that reproduces real payment failures and fixes them through seven experiments. Evolves from a Spring Boot monolith into a microservices saga with idempotency, compensation, and after-the-fact reconciliation across independent banks—mirroring how real payment switches work.

Applies the principles of double-entry bookkeeping to track resources, changes, and transactions in a system.

Enterprise-Grade Payment Processing & Double-Entry Ledger Platform · A production-tested, microservices-based payment processing system featuring double-entry bookkeeping, idempotent transactions, and extensible payment gateway integrations.