Building a Treasury SaaS with React, Node.js, Firebase & MySQL Applying 25+ Years of Software Experience to a Modern Financial Platform Hello DEV community, My name is Hernán Ricardo Ávila Castillo, a senior fullstack developer with more than 25 years of experience, currently based in Guatemala. I am also completing my degree in Computer Science and Systems Engineering. At the moment, my main focus is the development of a Treasury Management SaaS platform: a modern system designed to support real-world financial operations, payment workflows, balances, and business controls. In this post, I would like to share what I am building, why I selected this technology stack, and how I approach architecture when working on a fintech-oriented product. The Project: A Treasury / ERP Ecosystem The platform is being designed to support: Treasury operations Cash flow monitoring Accounts payable and receivable Payment approval workflows Financial tracking across projects and organizations A scalable SaaS foundation for future ERP modules This is not a demo project. The goal is to evolve it into a production-grade enterprise platform. Technology Stack After working with many technologies throughout my career, I decided to build this treasury system using a modern and reliable stack: Frontend: React React provides an excellent foundation for: Admin dashboards Component-driven interfaces Long-term scalability in UI development Backend: Node.js Node.js enables: Fast API development Strong integration capabilities Clean service-oriented architecture Authentication and Platform Services: Firebase Firebase is used for: Secure authentication Notifications Realtime capabilities when needed Simplified scalability for SaaS workflows Core Financial…
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