Full Stack AI Engineer (Next.js + Supabase) | Long-Term SaaS Project

Senior Full Stack AI Engineer (Next.js + Supabase) | Long-Term SaaS Project About the Project We are building a modern SaaS platform from the ground up. The product has already been fully designed from a functional perspective, including workflows, database architecture, user roles, business logic and UI specifications. We're not looking for someone to invent the product. We're looking for someone who can transform detailed specifications into a production-ready application. This is a real commercial product, not a prototype or a demo. What You Will Build The platform includes: User Authentication Subscription Management Stripe Integration PayPal Integration User Dashboard Admin Dashboard Workflow Engine Guided Multi-Step Operations Internal Calculators History & Statistics Notification Center Support Ticket System Multi-Account Management User Roles & Permissions PostgreSQL Database REST APIs Responsive UI Preferred Tech Stack Next.js React TypeScript Tailwind CSS Supabase PostgreSQL Experience with the following is a big plus: Cursor Claude Code GitHub Copilot AI-assisted software development Who We're Looking For We're looking for someone who: has already built SaaS products; writes clean, scalable and maintainable code; understands software architecture; communicates clearly; can work independently; actively uses AI tools to improve development speed and quality. We're not looking for someone who simply completes coding tasks. We want someone who can think like a technical partner. Important Requirements The platform is based on a Workflow Engine. Administrators create reusable workflow templates. When a user starts a workflow, the system creates an independent operation that must remain unchanged even if the original workflow is modified later. Understanding this architecture is essential. Long-Term Opportunity This is not a one-time project. If we work well together, there will be continuous development after Version 1, including: new platform features; CRM modules; landing pages; dashboards; marketing tools; AI integrations; mobile application. We are looking for a long-term technical partner. Please Include in Your Proposal SaaS projects you've built. GitHub or portfolio. Your experience with Next.js and Supabase. Which AI coding tools you use daily. Your preferred development workflow. Estimated timeline for a production-ready Version 1. Your hourly rate. Your timezone. Important: We already have extensive technical documentation (functional specifications, database design, workflows, user roles, business rules, UI specifications and system architecture). We expect the selected developer to follow these specifications closely rather than redesigning the product.