Customised Operating System

Looking for experienced Operating System developer! Please provide samples. Thanks. I need a customized interactive OS for Basic prototype demo. OS should be developed to work with iOS and APK app in the future. Main coding should include, hardware camera and voice detection to control action of 360 degree servo rotation. For Project Prototype, we will be using a smart mobile device to install the customized OS, do let me know if the hardware (Chipset) used will affect the software development. The mobile device will be connected to a Servo via Arduino Uno(Microcontroller) to control the servo 360 degree rotation. You may suggest otherwise. So, you will be required to code for the servo to follow and rotate towards user with camera motion and voice detection to interact. The device screen should always be facing the user or person giving command at all time! The basic system integration requirements: OS to integrate google voice for interactive voice control "Ok,google" "Google Now Voice"? Which should be always on active and ready for command. Please answer the below: 1. Do you have suggestions to make this project run successfully? 2. What past project or job have you had that is most like this one and why? 3. What questions do you have about the project? 4. What challenging part of this job are you most experienced in? 5. Which part of this project do you think will take the most time? Please provide quote. Duration and price. Thanks