Ledger-based financial transaction backend built with Node.js, Express, and MongoDB. Implements JWT authentication, ACID-compliant transactions, and idempotent APIs to ensure secure and consistent account transfers. Deployed on Render with MongoDB Atlas.

A lightweight Java library that ensures methods execute only once for duplicate requests. It uses customizable keys and storage providers to manage idempotency seamlessly across distributed systems.

Idempotent REST API with Redis — Idempotency-Key header, duplicate request handling, Spring Boot 21 & Docker Compose

Cloud-native, event-driven Node.js/TypeScript backend platform: transactional outbox, multi-device offline-first sync, idempotent health data ingestion, AI/ML and comprehensive observability