Full-Stack Developer for AI-Powered File Conversion Web App

We are seeking a full-stack developer to build a conversion tool web app with user authentication, file storage, and AI-powered utilities. The platform will support various file format conversions (e.g., image, document, audio) and include an AI-based background remover. Users should have a dashboard to manage stored files. The backend must support secure login, integrate PayPal for payments, and be hosted on a US-based Amazon (AWS) server. Front-end design will be provided. Experience with AI API integration, AWS, and scalable backend development is essential. Strong knowledge of modern frameworks (e.g., React, Node.js, Python, or similar) required.