Caleb Mwangi
How I Built a Smart Expense Tracker with Next.js 15, Supabase & Tailwind CSS

How I Built a Smart Expense Tracker with Next.js 15, Supabase & Tailwind CSS


Building side projects is one of the best ways to grow as a developer. Recently, I built a fully functional Expense Tracker that includes:

  • Real-time data synchronization
  • Beautiful dark mode UI
  • PDF report generation
  • Monthly analytics and charts
  • Receipt upload functionality

In this article, I walk through the complete architecture, major challenges I faced, and the lessons learned while building this application.

Perfect for developers who want to build production-grade full-stack applications.