AI-Native Full-Stack Developer - Initial Test Project for SaaS Platform (Prototype → Production)

The prototype already works. It's a single-file HTML app with a custom calculation engine, multi-step UX, and data visualizations. Your job: take it from prototype to production-ready. Clean architecture. Real database. User authentication. API connection. Fast. The bigger picture: We're building a platform that helps marketing agencies scale. AI-driven tools, automated reporting, all in an AI-first SaaS platform connected to real revenue data through the WhatConverts API. We have a clear product vision and working prototypes. What we need is a developer who can iterate quickly to turn them into production-ready tools. This includes everything from database architecture, to the WhatConverts API integration, to the app itself, to the AI layer that makes it intelligent. This is a paid test project. We'll start with one tool, a revenue forecast calculator. If the fit is right, this can become an ongoing engagement to build the full platform. About you: AI-native. You use AI tools daily and it shows in your speed. You ship fast, iterate faster, and don't over-engineer things. Comfortable across the full stack: frontend, backend, APIs, databases, auth, security. You've built AI-first SaaS before, or at least think in those terms. You get excited about making tools intelligent, not just functional. The stack is flexible. We care how you think and how fast you move, not which framework you swear by. But you should have opinions and be ready to defend them. To apply: - We move fast. Show us you do too. A project where you went from idea to production and shipped it quickly. What did you build and how long did it take? - AI is the foundation of the project, not a feature. Give us an overview of how you'd architect an AI-first SaaS platform from scratch. - Show us how AI lives in your own workflow today. Not tools you've heard about. How does AI actually live in your day-to-day development workflow? - This is a close collaboration project. Async is fine, but regular touchpoints on US time zone are non-negotiable. Tell us your availability and if that's your kind of thing. If this sounds like your kind of project, show us how you think. No templates.