Hi,
I'm an experienced nodejs backend developer.
I have worked on OAuth libraries like PassportJS, Firebase Authentication, Auth0, Permit and Grant.
I can provide POC's on the above with the document showing pros and cons of using each.
I can also work on the backend of the app and can deliver a quality product deliverable with unit test and integration tests covered.
I have expertise on containers also which help run the backend services independent of the platform and I can host the services on any cloud services provider.
Please have a look at my profile client reviews which are reflection of my work done so far.
Thanks,
Amit