As per your description, These type error occur due to version issue in manifest or android sdk related stuff.
I have similar kind of work experience.
Let me know more detail about your Project via private message for better understanding.
so we can identify the scope of work and provide an exact cost and timeline.
I'm interested in working with you. As per your interest, we can talk for a better deal. I am available almost the whole day for discussion.
I have just started freelancing and my aim is to start a company.
my main purpose is to serve product quality and client's satisfaction.
I am not just looking for fees or 1 project - I believe in long term business relationship.
Thanks & Regards,
Bhartendu Joshi.