Poll-based TCP Employee Database (C)

I wrote a Poll-based TCP Employee Database in C, as a individual project that uses poll() IO multiplexing and socket programming in C, I would love to see your suggestions and feedback's on the project, I Learned a lot about data packing, sending data over the network and network protocols in general, I'm happy to share the project link with you.
https://github.com/kouroshtkk/poll-tcp-db-server-client