I am looking for a Ruby on Rails developer who has specific experience building Single Sign-on solutions.
We have a number of RoR 3.0 and 3.2 apps which all have their own user database, generally using Devise.
We require you to build a central SSO service for us using Rails 3.2.x which will manage user registrations and SSO, and then provide us instructions on how to integrate the SSO solution into our apps so they can register / authenticate against it.
We can manage the migration of existing user data ourselves, so you won't need to worry about that.
Your SSO provider will need to have reasonable test coverage as well, preferably using rspec / cucumber.