OpenBSD, C, httpd and SQLite – Web App stack
If you want simplicity as your #1 objective then I would recommend Flask and Python. If speed is your #1 objective then you can try Go.Maintaining a C webapp is terrible.You don't have any primitives, you need to manage your own memory which is extremely dangerous, and the amount of best practices you need to learn so you won't shoot yourself in n the foot and create an exploitable/unstable application is immense.