https://jitsi.github.io/handbook/docs/dev-guide/dev-guide-web-jitsi-meet/
this is Developer Guide for Jitsi Meet.

Running with webpack-dev-server for development:
By default the backend deployment used is alpha.jitsi.net. You can point the Jitsi Meet app at a different backend by using a proxy server. To do this, set the WEBPACK_DEV_SERVER_PROXY_TARGET variable:

export WEBPACK_DEV_SERVER_PROXY_TARGET=https://your-example-server.com
make dev

My query is: Do I have to set up the backend on my own server? If yes, how can I develop the backend for Jitsi? This is because if I use the default proxy, the meeting ends after 5 minutes.

i would like to build customized jitsi project.