This post seems to suggest that a SaaS startup would consider creating their own SAML implementation. If a SaaS startup is considering creating a homebrew SAML implementation, they are doing it wrong.
When it comes to SSO, "buy" instead of "build", and focus on the core value proposition of the service with that saved time and resources.
Not necessarily, there are actually 3 options: Buy vs Build vs Use OSS :)
> https://github.com/boxyhq/jackson