Hello there my Indian friend!
My name is Victor Souto, i am a senior software engineer, 31 years old, from Brazil!
I have to say i am different from the usual freelancer. While everyone tries to deliver your project fast, i focus on your project and code quality. Believe me, i've been in your position and i know how painful it can be to find a good developer.
I also work with SCRUM and tools like Confluence and JIRA that gives transparency and agility to our development.
That are a lot of ways we can do your app: ionic, cordova, java, etc...
We can talk and depending on your app's requirements we choose the right architecture.
Best of luck!