CAS is the SSO solution used by plenty of universities and companies all around the world.
As a committer (the main one in Europe) of the CAS Open Source project, I'm one of its major contributors and I know very well its features and capabilities.
I talked about CAS at Devoxx France and for 8 years at the SFR telecom company, I have been in charge of one of the biggest CAS installations in the world (millions of users and logins each day).
I now work on CAS authentication projects for my clients.
As the creator and leader of the pac4j Open Source project, I perfectly master this software. I presented pac4j at the Paris JUG.
I often support clients to integrate their applications with pac4j in the best way or add new features.
I can also bring my expertise on the OAuth, OpenID Connect and SAML protocols, their related tools and the security libraries.
More generally, I can advise you about authentication, security, SSO, and IAM with best practices and audit.
Lastly, I sometimes help my customers with architecture design, performance audit, and multi-technologies development.