Design and implementation of a Debian SSO solution

The Debian project has an SSO solution that DDs (Debian Developers) and guests can authenticate against on different Debian websites. With the discontinuation of alioth.debian.org, the backend for the guest logins will be gone soon. The goal of this project will be to design and implement a new backend for guest accounts including a webinterface for (self)-management of those accounts and to integrate this backend with the existing debian SSO solution or to find a successor SSO solution that integrates both with the existing DD account backend and the new guest account backend.