Hello sir/ma'am,
I carefully read your post and got that you need a experienced, dedicated, punctual, honest and carefull android developer who can achieve your aspects about the project from frontend to backend, as well as you need a person who can understand your existing code to modify and debug it successfully.
So i think i am the best fit for you , i am waiting for your reaponse to work with each other to provide my services as well as expect appreciation from your side.
You can check out my lived apps at my freelancer portfolio and i hope i will also add your work in my portfolio after successfully delivered to you.
Thanks & Rrgards,
Aman Singhal