Hello,
Im Pedro Marcano, Web and mobile developer, i have good experiences working with web technologies and javas/android, and creating web services for communicating both over nodejs.
Use to work with a graphic designer with strong knowledges on ux/ui, on this cain of project, creating beautiful and clean layouts base on android material design.
HOpe can be in touch and help you in anything you need, im always connected, 8h/7d per week.
About how we handle the payment's, we first make the job and base on that we create a milestone only if you are agree with the work.
Regards.
Pedro Marcano D.