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HERNAN RICARDO AVILA CASTILLO
HERNAN RICARDO AVILA CASTILLO

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Building a Treasury SaaS with React, Node.js, Firebase & MySQL

#showdev #react #node #saas

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 Database: MySQL

MySQL remains a strong choice for treasury data because it provides:

  • Relational consistency
  • Transactional reliability
  • Strong reporting and structured modeling

High-Level Architecture

The platform follows a modular SaaS architecture:

React Admin Dashboard
        |
        v
Node.js REST API Layer
        |
        +-------------------+
        |                   |
   Firebase Auth       MySQL Database
        |                   |
 Notifications        Treasury Ledger + ERP Data
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This separation allows:

  • Clear API boundaries
  • Enterprise-grade data integrity
  • Independent scaling of modules

Key Design Principles

After more than two decades building software, several principles remain constant:

1. Financial systems require strong consistency

Treasury platforms must be auditable, traceable, and transaction-safe.

Data integrity is not optional.

2. SaaS requires modular thinking

Every module must evolve independently:

  • Payments
  • Clients
  • Projects
  • Approvals
  • Reporting

3. Automation is part of the future

The platform is being developed with automation in mind, integrating AI-driven workflows using tools such as n8n and Make.

Treasury is not only accounting. It is operations.

What I Am Building Next

Upcoming milestones include:

  • Multi-tenant SaaS structure
  • Role-based access control
  • Payment gateway integrations
  • Approval pipelines
  • Financial reporting dashboards
  • Cloud-native deployment workflows

Why I’m Sharing This Here

I am joining DEV.to to:

  • Share real-world software engineering experience
  • Learn from the community
  • Document the evolution of this treasury platform
  • Connect with others building fintech and enterprise systems

Final Thoughts

Even after decades in software, building systems like this remains exciting. Technology evolves constantly, and so do we as engineers.

If you are working on treasury platforms, ERP systems, fintech SaaS products, or React/Node architectures, I would be glad to connect and exchange ideas.

Thank you for reading.

Links

#dev #react #node #firebase #mysql #saas #fintech #softwarearchitecture

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