I need IOS Developers, I want to make a IOS application

Hello IOS Developers, I want to make a IOS application, This is a presentation quiz application used over public places like seminars, meetings etc. I will be having the master password, I will add members to the application who wish to use my quiz application and send them the username and password. Once my member receive login he will create a team of contestants and create a quiz and send the login details to their contestants. Once the contestant log in they will see that quiz only. Now the demonstration will start of quiz questionnaire on screen and admin should have control over questions speed. The answers should be visible after 10 seconds (timer we should be able to set from backend) the questions can have text, images as well. if one contestant press the buzzer first, other buzzers will be disabled automatically and the team pressing buzzer has to answer. the answers will be visible over admin panel live. There should be user defined scoring for each questions + and - marks. After the quiz is over the summary of top performing teams with marks should be visible. Even though I have selected Iphone/ Ipad app, I want android app also. The final endorsement may have slight changes in this app, I want atleast 2 revisions to be verified. Also I want this app to be hosted live after finalized and also I want source code. I want to discuss about the database used, I have oracle installed. I can give it as connection.