App Development for iOS, Android Platforms

I am in search of seasoned IT professionals for app development, with a preference for a team or an individual experienced in creating applications for iOS and Android platforms. The key functionalities that this application must possess are:

Scope of Work for 'Language AI' Mobile App Development
1. Introduction
2. General Requirements
3. High-Level Features
4. Technical Requirements
5. Testing and Quality Assurance
6. Project Deliverables
7. What we require from a potential partner (Proposal requirements):

Further, I am expecting familiarity with integration to external APIs, as it will be a part of this project. Familiarity with APIs for user management, messaging and notifications, would be an added advantage. Do review the attached document for a more detailed project description and please bid accordingly. Your proposal should illustrate your experience with similar projects, and your projection for project timelines. Looking forward to collaborative partnerships.