RxApp — Enterprise ERP, AI

RxApp — Enterprise ERP, AI Operations & Client Lifecycle Management Platform

Architected and engineered a comprehensive, custom ERP/CRM and business operations suite designed to centralize client management, sales pipelines, recurring service catalogs, project delivery phases, and AI-driven proposal generation.

Core Architecture & Technical Highlights:

• Modern Frontend: React 19 SPA built with TypeScript, React Router v7, TanStack Query v5 for server-state caching/optimistic UI, and Tailwind CSS v4 design system tokens.

• Modular Backend API: Node.js and Express.js layered architecture with Mongoose (MongoDB), Helmet security headers, JWT stateless authentication, and express-validator sanitization.

• Google Gemini AI Integration: Powered by @google/generative-ai with an intelligent dynamic model fallback chain (Gemini Flash series), dynamic runtime API key hot-swapping, and Xtreme-AI role-filtered knowledge base chat.

• 3-Stage AI Proposal & Scoping Engine: Interactive requirements extraction, technical dimensioning, commercial quotes with multi-installment terms, and automated technical runbook generation.

• Granular RBAC: Strict 5-tier Role-Based Access Control (SuperAdmin, Executive, Dev Director, Commercial, Financial).

• Sales & Billing Pipeline: Multi-currency invoice tracking, payment receipt processing (Multer), and phase-based project scheduling.

Stack: React 19 • TypeScript • Node.js • Express • MongoDB • Google Gemini API • TanStack Query • Tailwind CSS v4