Designed and developed a full-stack "Guest House Management System (GHMS)" to digitize and automate the room booking operations for NEERI’s guest house facilities. The system replaced manual processes with a centralized, transparent web application for managing guest requests and administrative approvals. Full-Stack Development: Built a responsive web application using Python Flask for the backend and HTML/CSS/JavaScript with Jinja2 templates for the frontend. Backend & API Design: Developed RESTful APIs to handle booking form processing, input validation, and secure document storage (e.g., Aadhaar/Organization IDs). Database Management: Implemented an SQLite database to ensure transactional integrity, managing room inventories and booking records efficiently. Core Logic Implementation: Engineered complex server-side logic for real-time room availability checks to prevent double-bookings and automated unique booking ID generation for request tracking. Admin Dashboard: Created a secure administrative interface allowing staff to view real-time pending requests, verify documents, and update booking statuses (Approve/Cancel) instantly. Testing & QA: Conducted comprehensive unit and system testing to ensure cross-browser compatibility and data persistence stability.