Build a Secure Cloud-Based Document Storage System

Storing sensitive files like contracts, legal documents, or intellectual property in the cloud demands robust encryption, strict access control, and auditability. This project provides secure document storage while meeting compliance regulations like GDPR or HIPAA.

Allow users to upload documents that are encrypted at rest and in transit, with access governed by roles or token-based sharing. Include file versioning, expiry-based links, and a secure frontend dashboard for access logs and file previews.

Files are uploaded through a secure frontend. A backend service (Node.js/Firebase Functions) encrypts and stores the files in S3 or Firebase. Metadata is saved in Firestore or DynamoDB. Users can view access history, restore older versions, or revoke sharing permissions.

• Frontend: React.js with secure file input components
• Backend: Node.js/Express or Firebase Functions with AWS SDK
• Storage: AWS S3 (SSE-KMS) / Firebase Storage
• Database: Firestore / DynamoDB for metadata and roles
• Auth: Firebase Auth / AWS Cognito for user management

• AWS S3 Server-Side Encryption with KMS
• Firebase Storage Security Rules
• Create Pre-Signed URLs for Secure Sharing
• Firestore Role-Based Access Control
• Build a Document Management App with React & Firebase