Modify my Existing App - Add more Features

I have an existing social app for android and ios. Now I need to add more functions (total 5 new core functions) to it ( first in android and then replicate it to ios). I will discuss in detail with the person I select. You are required to have worked before, on following since they will be used: - Google Maps API and GeoLocation API - Event App - Worked on a social app before, so as to have knowledge of profiles and followers/ friend list, recommended friends etc. The existing app is built with API using PHP / MySQL backend, so knowledge of that is also required. I have some existing code with me for the functionalities that are to be developed, so you can use that if it helps, and it can be used for partial implementation of the functionality, thereby saving time and cost. Time and Budget are limited, so please bid as per that that. If I like your work, you will be immediately hired for the next phase also. Before starting the project, you will have to sign an NDA. Milestones will be released timely when the corresponding functionalities are completed and duly tested, with final milestone after app is submitted to play store and app store. Please share your existing work as per the above functionalities are to be developed, as well as your expertise about them. Freelancers who are willing to consider this project as their own and can apply few of their inputs as well for creating a great app, are always welcome :)