Case Study 01 · Full-stack platform rebuild

Custom Membership Platform Build — Next.js, Supabase & Claude API

Next.js · FastAPI · Supabase · Stripe · Claude API

The Problem

The founder had a member dashboard living on Wix — which meant someone else controlled the auth, the data, and the ability to scale. The product had real traction but no foundation: payments weren't integrated, AI was powered by a third-party model with no brand alignment, and every meaningful upgrade required working around a platform designed for something else entirely. Staying on Wix was a ceiling, not a floor.

The Build

We designed and built a complete platform from the ground up: Next.js frontend on Vercel, FastAPI backend on Railway, Supabase for auth and data, Stripe for payments, and the Claude API split across two models — Haiku for cost-sensitive features, Sonnet for premium work. The result is a fully owned, platform-independent stack with native app readiness woven in from day one. We also engineered an 11-layer AI safety architecture to prevent cross-user data contamination in the AI intake agent.

The Outcomes

— Moved from zero monetization to two live revenue streams: $9/month subscription and $69 one-time Lifetime Analysis

— AI operating costs held below $20/month at launch scale — 60%+ reduction from original architecture

— Report generation pipeline produces ~14,400-word personalized reports at ~$0.20/report on a $69 product

— Platform architected for iOS and Android deployment with zero structural changes required

— Eliminated all third-party platform dependencies — auth, data, payments, and AI fully owned

The Stack

Next.js FastAPI Supabase Stripe Claude API Vercel Railway Resend Cloudflare Tailwind v4

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