Full-Stack Developer for Deriv Third-Party Trading Platform

Project Overview: I am looking for an expert full-stack developer to build a commercial, multi-user web application that operates as a third-party trading interface for the Deriv platform, closely resembling the functionality of systems like Dbotspace or OsamTradingHub. Key Project Deliverables: 1. User Authentication & Dashboard: Users must be able to sign up, log in, manage subscriptions, and securely save their personal Deriv API tokens (configured with Read/Trade permissions only). 2. Subscription & Payment Wall: Integration with payment gateways (like Stripe or automated M-Pesa options) to lock and unlock access to specific premium automated trading bots. 3. Automated Trading Engine: The backend must connect seamlessly to the Deriv API via persistent WebSockets. It must reliably run a server-side Martingale strategy script with user-customizable input fields (Initial stake, multiplier, max loss steps, and daily profit targets). 4. Live Charting: Embed real-time financial tracking widgets (such as TradingView) directly onto the user dashboard. Preferred Tech Stack: - Frontend: React.js, Next.js, or low-code frameworks like Bubble.io. - Backend: Python (FastAPI/Asyncio) or Node.js to handle asynchronous WebSocket data feeds efficiently. - Database: PostgreSQL or Redis for fast, secure caching. Important Security & Delivery Requirements: - Initial testing MUST be done exclusively using a Deriv Virtual Demo Account. - Code architecture must guarantee complete separation of concurrent user trading sessions. - Full source code ownership and repository transfer are mandatory upon completion before final milestone release. Long-Term Retainer Opportunity: This initial platform build has a dedicated budget of $800 USD. My goal is to build a long-term business partnership. Upon successful launch of a stable MVP, the selected developer will be transitioned to a monthly maintenance retainer contract ($100-$200/month) to oversee server optimizations, implement security patches, and build future bot strategy updates as our user base grows.