Hi, I would like to get a quote for developing a web-based SaaS tool for marketplace sellers. This is NOT a mobile app, only a website with user accounts. The tool should help people who sell on platforms like Vinted, eBay, Facebook Marketplace, Subito, Depop, etc. (multi-platform support, not connected to only one site). I need an MVP version first, not a full complex product. Main features required: 1) User system - Login / register - User dashboard - Subscription ready (for future, not required now but structure should allow it) 2) AI listing generator - User uploads photo of a product - User writes brand / type / condition - AI generates: - title - description - tags / keywords - suggested category - Should use AI API (OpenAI or similar) 3) AI product photo tools - Upload photo - Background removal - Background replacement (white / simple / studio) - Image enhancement (light / sharpness / resize) - Optional future: AI mockup / model wearing clothes 4) Price suggestion feature - User writes product name - System gives estimated price range - Simple version is ok (manual database or API) - Later upgrade possible 5) Multi-platform helper Tool should help creating listings for different marketplaces: - Vinted - eBay - Facebook Marketplace - Subito - Depop No need for automation login on those sites. Only generate optimized listing text and data for each platform. 6) Alert / search feature (optional if too complex) - User can set keyword + max price - System checks listings and sends notification - Can be email or Discord webhook 7) Discord integration (optional but preferred) - Notifications - Basic bot connection 8) Admin panel - Manage users - Manage limits - Manage API keys - Manage database Tech requirements: - Web app (React / Next / Vue / etc. OK) - Backend with database - AI API integration - Should be scalable for future updates Please tell me: - Estimated cost for MVP - Estimated time - What stack you suggest - If you already built similar SaaS This is a startup project, so I want a simple but clean first version.