React + Supabase Developer : Production Build of Existing Prototype

Project Overview I have a fully functional React prototype of a proprietary web-based business tool. The prototype has been built, tested, and validated. I need a skilled developer to build the production-ready hosted version. This is a precise execution job. A detailed Developer Brief (provided after NDA) specifies every feature, field, validation rule, output format, and architectural requirement. Your job is to build exactly what is described. The Job The prototype UI is built and working. The primary work is: 1. Replacing local/browser storage with a proper cloud database 2. Building the API layer connecting the UI to the database 3. Implementing the data model, cascade logic, and validation server-side 4. Deploying to a hosted environment at my domain 5. Importing default data at launch 6. Transferring all source code and IP to me This is not a design job. The UI exists. This is a data layer and infrastructure build. Technical Requirements Frontend: React (existing prototype is React/JSX) Backend: REST API or GraphQL connecting to a cloud database Database: Cloud-hosted, persistent (Supabase preferred; alternatives considered) Hosting: Vercel or equivalent (fully documented and transferable to client) Responsive: Desktop and mobile Non-Negotiables No AI features of any kind No third-party analytics, tracking, or data collection No unapproved external dependencies Daily commits to a private GitHub/GitLab repository I own and control — from day one Fixed-price, milestone-driven contract — no hourly billing NDA required before receiving the Developer Brief or prototype IP Assignment Agreement required before work begins All work product belongs to me from the moment it is created What I’m Looking For Strong React experience Solid Supabase or equivalent backend experience Someone who reads specs carefully and builds what is written Clear communicator who flags questions early US-based preferred, but open to others with strong English and relevant experience Proposal Requirements Please submit your proposal with: Your relevant experience (React, Supabase or similar, web app builds) Examples of similar projects Your estimated price range for this type of engagement Your availability and estimated timeline Note: The Developer Brief and prototype are provided only after NDA is signed.