🚀 Designing a Scalable File Storage System (Dropbox-like)
Recently, I worked on designing a cloud-based file storage system that supports upload, download, sharing, and syncing across devices. Here’s a quick breakdown 👇
🔹 Core APIs
POST /files → Upload file + metadata
GET /files/{fileId} → Download file
POST /files/{fileId}/share → Share with users
🔹 High-Level Design (HLD)
API Gateway (Auth, Routing, Rate Limiting)
File Service (handles metadata & logic)
Blob Storage (e.g., S3) for actual files
NoSQL DB for metadata
CDN for fast downloads
🔹 Key Challenges & Solutions
✅ Large File Uploads
Chunking (split into smaller parts)
Parallel uploads + resumable support
ETag-based chunk validation
✅ Scalability
Direct upload via pre-signed URLs
CDN caching for frequently accessed files
✅ Sharing
Share table mapping users ↔ files
Secure access using tokens/links
✅ Reliability & UX
Progress indicators
Retry + resume on failures
🔹 Security
Encryption (at rest & in transit)
Authentication + Authorization
💡 Takeaway:
Designing such systems is all about balancing scalability, reliability, and user experience while keeping latency low.
👉 I’ll be sharing the GitHub implementation soon—stay tuned!
Would love feedback or suggestions to improve this design 🙌
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