API Integration - Add 2 APIs to Android App (Firebase & JavaScript)

Seeking a US-based contract/temp developer for a small API integration project. I'm looking to integrate two APIs into an existing mobile app for proof of concept. App uses Google Firebase and is written in JavaScript. The two APIs use OAuth 2.0 authorization with “OAuth 2.0 grant type” access. (I have the access token.) Inputs in the request are First Name, Last Name, Middle Initial, SSN. The API integration project consists of: - Adding one (1) button to the app's home screen - Adding 1-2 screens for users to input the info for the API request - Integrating the two (2) APIs - Adding fields to the firebase database to support the data returned in the API response. I have attached a screenshot of the current home screen that highlights where the new button will go. If you are a developer that cares about using your skills for good, this could be a really cool project. This is a paid, fixed fee project. Please give an idea of timeline and what you'd charge for this type of project work.