digital signal processing code for a react native mobile app

I am looking for the development of digital signal processing code for a React Native mobile application. Specifically, I need audio processing code for both Android and iOS platforms. This is a music learning app that will show the user scrolling music, receive audio via the user's microphone, and crosscheck it against musicxml data to give real-time feedback on pitch (similar to a tuner) and time (rhythm). I have existing code that I would like incorporated into this new code. I am looking for an experienced developer who can create a comprehensive and efficient code architecture. This code should be optimized to ensure the best possible performance and stability in my app. Your knowledge of digital signal processing and React Native development is paramount for the successful completion of this project. Please feel free to reach out to me if you have any questions. I am looking forward to working with you to create an amazing piece of software. Thank you!