Dear Client.
I've carefully read your job description among a lot of job posting with great interests, this looks like perfect fit for my skill sets and experience.
As a senior iOS and Android app developer with more than 9 years experience, I have successfully completed apps with similar features to your project so far.
I am a full stack developer with Mobile Frontend + Backend skills, so I can build whole system for you.
In addition, I am deeply involved in creative mobile design, Database, API integration, Firebase, and Google APIs.
I can work in your time zone and fully understand your opinion through free communication.
After complete project, I can
1. support fixing bugs with free. ( Collateral term : 6 months )
2. support update features with low price.
I am ready to start immediately.
I am available to work full time(40~50 hours per weeks) If I work on a project, it means that I take responsibility to make it successful.
Thank you for your consideration
Best Regards