In future I am hoping to make a non-profit organization that specialises in developing open-source libraries and tools aimed at junior developers.
I've been considering making the website and backend for said organization open-source as well under the AGPL license. (Includes account management, database, redis, etcetc.)
There are 3 reasons: 1) Transparency, not that I associate closed-source as non-transparent but it does make clear what we're doing especially regarding users data. 2) Community can contribute, makes it easier for them to help improve areas of the service they like. 3) Education, code that can be referenced or even used in other projects flat out by users.
Are there other companies that have an open-source backend? I know some services like GitLab, Weblate, and Bitwarden are open-source; I assume because they need to be self-hostable as well.
Are there other examples of companies having an open-source backend?
Are there any big things regarding security that one should be aware of other than the normal things like no credentials in git, requiring SSL where appropriate, firewall etcetc?