Designed and developed a robust, full-stack billing and hospital management application to digitize financial workflows and ensure tax compliance. The software replaces manual entry with a streamlined dashboard that tracks daily revenue, patient invoices, and comprehensive tax reports. Key Features:Automated GST Invoicing: Engineered a dynamic billing engine with automatic calculation of CGST, SGST, and IGST, featuring real-time invoice generation and GSTR-1 JSON export. Secure Access Management: Implemented role-based access control (RBAC), allowing tenant administrators to securely manage staff credentials and system access. Entity Management: Built relational modules to manage patient data (Parties) and maintain a customizable catalog of medical services and inventory (Items). Financial Analytics: Developed a centralized dashboard tracking daily collections across multiple payment gateways (Cash, UPI, Card) and historical Day Book reporting. End-to-End Client Handover: Produced comprehensive, visually guided technical documentation outlining system navigation, administrative configuration, and legal compliance, ensuring smooth client adoption without technical friction.