FileSpark is an end-to-end file upload and sharing system designed around a distributed architecture.

Users can upload files directly from their desktop through a native Java client using either:

• Right-click → Upload
• Global hotkey (Ctrl + Shift + U on Windows/Linux, Cmd + Shift + U on macOS)

Files are uploaded securely to Amazon S3, and a shareable filespark.com link is automatically copied to the user's clipboard for instant distribution.

The system is composed of a native desktop client, a Spring Boot backend API, a React-based web application, and cloud object storage.

FileSpark follows a layered architecture:

Desktop Client → Spring Boot API → MongoDB + Amazon S3
Web Application → Spring Boot API → MongoDB + Amazon S3

The backend is responsible for authentication, file metadata management, and generating presigned S3 URLs that allow clients to upload directly to object storage without exposing credentials.

• Java – Core language for native client logic
• JavaFX – UI framework for cross-platform desktop interface
• Native OS integrations for clipboard access and global hotkeys

• Spring Boot – REST API layer and application framework
• MongoDB – NoSQL database for user accounts, file metadata, and cluster management
• Amazon S3 – Scalable object storage for uploaded files
• Presigned URL workflow for secure direct-to-S3 uploads

• React (TypeScript) – Component-based frontend architecture
• Tailwind CSS – Utility-first styling framework for responsive UI

• Maven – Dependency management and build lifecycle for backend services