Build me Microservices

I am a software architect based out of the US , looking to create an oauth web and mobile api with mongo/dynamo db as the backend. The user should be able to login using their twitter, gmail, facebook or github account, else register with their username or password. When they login using their social account , the user should be auto registered to the site. The auth server should also be able to generate jwt tokens for authorization to future api's. Scenario - User is prompted to login using social login or register. For registration only an emailid and password should be prompted. Once logged in the user should be redirected to a prompt where user should be able to select vendor/customer. This should be then be stored to the document DB. The auth server should also be able to generate tokens, that can be validated by the client application for authorization. Simple examples are available in github and hence the project is a small one.