The Backend Master Class by Tech School provides comprehensive training on building production-ready applications using Go, PostgreSQL, and Kubernetes, featuring JWT/PASETO authentication, Docker, and AWS deployment. Secure and free large file transfers within this stack are achieved by utilizing Go's io.Copy for streaming, implementing TLS via cert-manager, and employing self-hosted storage solutions like MinIO. For more details, visit Udemy .
The io.Copy uses a dynamic buffer (default 32KB). Even with a 100GB file, your memory usage stays at ~32KB + connection overhead.
Here is how you wrap a file stream in encryption on the fly: The Backend Master Class by Tech School provides
}
stream := cipher.NewCTR(block, iv) writer := &cipher.StreamWriter{S: stream, W: dst} The io
The course emphasizes using open-source tools (MinIO for S3-compatible storage, Let's Encrypt for certs, JWT for auth). No hidden cloud costs or proprietary SDKs.
import ( "io" "net/http" "os" )
Enterprise vendors charge thousands for "Secure FTP." You can do it better for free.
}
"Securely" is the keyword in our requirements. Security must be baked in, not bolted on.
Why involve Postgres? We need ACID compliance to answer questions like: "Did the user pay for this transfer?" "Is this user authorized?" "Where is the file stored?" No hidden cloud costs or proprietary SDKs