QuantraAI

• Next.js 16
• React
• TypeScript
• Nest.js 11
• Drizzle ORM
• Neon Postgres
• Vercel AI SDK
• Vercel AI Gateway
• Auth.js v5
• Zod
• Stripe
• TanStack Query
• Recharts
• Tailwind CSS
• Vitest
• GitHub Actions

A markets analytics platform for stocks and crypto that finds patterns in price data and explains them in plain English. The statistics are worked out in TypeScript first, and the AI only ever reads the finished numbers and writes them up, so it cannot invent a figure. Every call the system makes is recorded and checked against what the market actually did a week and a month later, and that scoreboard is public. The same engine points at personal finances too: Financial Health takes income, commitments and debts, works out what is affordable and compares four repayment plans, holding money as whole pence so the arithmetic never drifts. Around all of it sits an eval suite of 36 checks that scores the AI on whether it invented anything, stayed inside its limits and degraded cleanly when the model was unavailable, plus a log of every model call with its tokens, latency and cost. Built with Next.js on Vercel and Nest.js on Railway, over Postgres with Drizzle, and Stripe billing enforced on the server.