Ledgerly Finance API
A concept backend platform providing a secure transaction API for a personal finance product.
Overview
A sample backend case study focused on secure, auditable transaction processing for a fictional finance product.
Problem
The product needed a transaction ledger with strict auditability and consistent balances under concurrent writes.
Solution
A Spring Boot service with double-entry ledger design, idempotent transaction endpoints, and full audit logging.
Features
- Double-entry ledger model
- Idempotent transaction API
- Full audit trail
- Role-based API access
Architecture
Spring Boot microservice backed by PostgreSQL, containerized with Docker, with structured logging for auditability.
Results
Illustrative outcome: a transaction model resilient to concurrent writes and reconciliation errors.
Challenges
Ensuring correctness under concurrent transactions without sacrificing throughput.
Lessons
Modeling money movement as immutable ledger entries simplified auditing significantly.
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