I need a straightforward business-services web application focused on secure file upload and download. The goal is to let my team and our clients exchange documents quickly through a clean, browser-based interface. Core requirement • Robust file upload/download module that can handle common formats (PDF, DOCX, XLSX, images) with size limits I can adjust later. Nice-to-have (but not mandatory) features you may suggest—such as user authentication or a small analytics dashboard—are welcome if they fit smoothly into the build, yet the first milestone remains a working file exchange flow. Please outline: • The stack you propose (e.g., React + Node, Django, Laravel, etc.) • Turnaround time for an MVP • Any security considerations you typically implement for file handling (virus scanning, role-based permissions, audit logs). Once this core is solid, I intend to grow the app, so clean, extensible code matters.