AI Expense Tracker: Budget & Spend Intelligence
Autonomous personal finance platform with Supabase SSR, TanStack Query v5, and Recharts.
Lead Full-Stack Architect
2025 • Active Production
Personal Finance & Full-Stack Systems
AI Expense Tracker provides real-time financial observability and automated expense categorization. Architected on Next.js 16 App Router and React 19, the application features Supabase SSR with strict PostgreSQL Row-Level Security (RLS) guaranteeing tenant data isolation. State synchronization is powered by TanStack Query v5 and Zustand for optimistic updates, zero-latency transaction search, interactive monthly spend-velocity charts via Recharts, and dynamic CSV export.
A production full-stack financial intelligence application built with Next.js 16, React 19, Supabase SSR Auth with Row-Level Security, TanStack Query v5, Zustand, and Recharts.
CHALLENGE & ARCHITECTURAL SOLUTION
Most budgeting tools suffer from sluggish manual data logging, complex spreadsheet formulas, and privacy concerns regarding confidential financial records stored in unencrypted third-party repositories.
Designed and deployed a responsive Next.js 16 web app backed by Supabase SSR and granular PostgreSQL Row-Level Security policies. Enabled optimistic state mutations with TanStack Query v5 and reactive visual telemetry with Recharts.
ARCHITECTURAL BLUEPRINTS
PostgreSQL Row-Level Security (RLS) Isolation
Every SQL transaction query executes under strict tenant-level RLS policies (auth.uid() = user_id), preventing data leakage across user boundaries.
Optimistic Hydration with TanStack Query v5
New expenses and budget adjustments reflect instantly in the UI while asynchronous network reconciliation guarantees eventual server consistency.
Vector-Sharp Analytics with Recharts
Dynamic SVG charts visualize category proportions, savings rates, and burn velocity across customizable time horizons.
CORE SYSTEM CAPABILITIES
Next.js 16 App Router & React 19 concurrent rendering architecture with TypeScript
Supabase SSR authentication with Row-Level Security (RLS) ensuring strict tenant privacy
TanStack Query v5 state cache with optimistic mutations and seamless cache revalidation
Interactive data visualizations: Monthly burn rate, spend velocity, and category charts with Recharts
Real-time expense filtering, multi-column sorting, date range picking, and CSV export
Zustand global state management with GSAP micro-interactions and dark/light themes
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