FlowFile

Inspiration: We were frustrated by failed uploads and corrupted downloads. Large files and unstable networks often mean wasted time and bandwidth. We wanted a smarter, self-healing transfer system that makes file transfers reliable, efficient, and stress-free.

What it does: FlowFile (built on CVTP — Checksum-Validated Transfer Protocol) splits files into small chunks, validates each one with a checksum, and automatically resumes interrupted transfers.

It guarantees 100% data integrity, supports priority queues, and provides a real-time progress dashboard — making every transfer reliable, resumable, and verifiable.

How we built it: Backend: Python with a custom TCP-based transfer engine and SHA-256 checksum validation.

Frontend: React dashboard with WebSocket updates for real-time progress. Core Features: Chunk-based transfer, auto-resume, error recovery, and dynamic priority management.

Challenges we ran into: Building FlowFile wasn’t easy. Our biggest challenges included:

1. Efficient Retransmission Logic: Designing a system that re-sends only failed chunks without wasting bandwidth.
2. State Synchronization: Keeping the client and server perfectly in sync after sudden disconnections or crashes.
3. Real-Time Dashboard: Updating progress and recovery logs instantly without overloading the backend.
4. Checksum Validation Performance: Ensuring integrity checks didn’t slow down large file transfers.
5. Testing Under Unstable Networks: Simulating real-world conditions to verify true reliability and self-healing.

Accomplishments that we're proud of: 1. Built a working prototype with automatic resume and checksum validation.

1. Created a live dashboard that visualizes recovery and progress.
2. Achieved fully reliable, corruption-free transfers in all our tests.

What we learned: We learned how to build fault-tolerant systems, ensure data integrity with checksums, and balance speed, reliability, and usability.

What's next for FlowFile: We plan to add end-to-end encryption, adaptive chunk sizing, and cloud storage integration (S3, Drive, Dropbox).

Built With

• amazon-web-services
• checksum
• cloud
• github
• javascript
• python
• sqlite