Here is the Telegram group: t.me/bisq_p2p

The forum post about it: https://bisq.community/t/thoughts-on-getting-more-people-into-bisq/8224/15

And Link to the main Bisq topic on BTT: https://bitcointalk.org/index.php?topic=4509053.msg52145753#msg52145753

The programming langage is Java, about the required level, I think it will depends, but pls come to talk to others Devs on the Slack.