Full Stack Developer React Developer for AI-powered SaaS platform (Node.js, Supabase, Next.js)

We are looking for a Full-Stack Developer Needed to join an ongoing project on our SaaS platform. This is a fixed-price engagement of $500 for one clearly defined feature, with potential for Ongoing Development and future AI-powered product enhancements. About the project Our Web Application helps users discover, plan, and book activities, experiences, and events. Users can search by location, date, budget, group size, and interests; compare options; select an activity; and complete the booking and payment online. The platform also serves activity providers, who can list their offerings, manage availability and pricing, and receive bookings. We are improving the product to make discovery, booking, and payments smoother. Your role You will work on a clearly defined feature across the full stack: Web Design, Front-End Development, Back-End Development, API Integration, and payment-workflow improvements. You will collaborate with our team to understand the requirements, propose a practical technical approach, implement the feature, test it, and deploy it within the existing Web Development codebase. Scope of work *Implement a new customer-facing feature in the existing SaaS platform *Build responsive UI components using React, JavaScript, HTML5, and CSS 3 *Develop backend logic using Node.js and TypeScript *Work with PostgreSQL for data modeling, queries, and migrations *Improve or extend the existing Stripe payment flow using the Stripe API *Ensure a polished, mobile-friendly Responsive Design *Follow Git workflows, participate in Agile Software Development, and maintain clean, scalable code *Perform testing, bug fixing, documentation, and deployment support Example feature *One possible feature is an AI-powered activity recommendation and checkout flow: *Users describe their preferences, budget, location, group size, and available dates *The platform suggests relevant activities or packages *Users select an option, customize it, and proceed to payment *The system creates or updates the order, applies pricing rules, and processes payment through Stripe The backend records the transaction and provides a clear confirmation flow Required skills *Strong experience with HTML, CSS, and modern Web Application development *Proven ability to deliver end-to-end Software Development and Software Design *Experience with Full-Stack Development, RESTful APIs, authentication, and secure backend workflows *Understanding of Software Architecture & Design and Database Architecture *Experience with Redux, Bootstrap, MongoDB, or AI development is a plus How to apply Please include: *A short introduction describing your relevant full-stack and Stripe experience *Links to similar web applications you have built *Your preferred approach for implementing a payment-related feature with the Stripe API