I would rather have a Nix devShell.

Is there a good solution for devshell with associated services? The app itself is fine that way, but what about the database, message queue, seed data, etc.?

edit: A really simple and effective process manager is foreman and its procfile format. I like the golang version of it (simple single binary with zero dependencies): https://github.com/ddollar/forego or https://github.com/mattn/goreman