Migrate authentication based on passport js to Firebase

Numerical platform ([login to view URL]) is developed using MEAN stack and currently uses Passport based authentication. Developer is expected to migrate authentication to Firebase Authentication. Implementation must support UI flows for signing in users with email addresses and passwords, phone numbers, and with popular federated identity providers, including Google Sign-In and Facebook Login. High level scope includes, but not limited to: Set up sign-in methods, Customize the sign-in UI, Implement UI flow. Platforms to be supported: Existing Numerical Web App developed using MEAN stack, Dummy iOS and Android apps (for purpose of testing only). Migrate existing registered users (around 225 local, 25 federated twitter and facebook) User information and session management in front-end Proposal to include: Understanding of the requirements. Detailed scope of work. Deliverables that will be provided at the completion of the project. Requirements,such as Firebase Account etc. Effort estimates in person hours. Fixed price estimate. Numerical is a new and unique platform that provides news, information, data and analytics. Last year it received 148K+ page views. Over 77K+ users from 2,292 cities across 147 countries visited the platform. ([login to view URL])