SUIJIN AI
Predictive Analytics Platform
Overview
An AI-powered boat-race prediction and analysis service. Leveraging BoatraceOpenAPI for real-time data, GPT-4 via Vercel AI Gateway for race analysis, Supabase for data persistence, and PayPay for payment integration.
Role
Founder & Full-Stack Engineer
Tech Stack
Challenge
Creating an accurate prediction system that processes real-time race data, integrates multiple data sources, and delivers actionable insights through natural language analysis. This required handling high-concurrency data fetching during live race events.
Solution
Built a full-stack Next.js 16 application with Supabase for authentication and data storage. Integrated the Vercel AI SDK with GPT-4 for natural language race analysis. Implemented a dual payment system with PayPay and Stripe. Achieved comprehensive test coverage using Playwright for E2E and Vitest for unit tests.
Live Demo
Screenshot of the project in action
Results
- Full-stack SaaS with authentication, payments, and AI analysis
- Dual payment integration (PayPay + Stripe) for Japanese market
- Comprehensive E2E test suite with Playwright
- Real-time data pipeline processing race information
Learnings
Gained deep experience with the Vercel AI SDK and prompt engineering for domain-specific analysis. Learned the complexities of integrating Japanese payment providers (PayPay) alongside international ones (Stripe).