Our developers are super experienced developers, so it’s $60/h ~ $70/h normally.

Sure, no problem. if you want only one developer, you can work with him or her directly and individually.

We can make contracts on Guru. comand get paid via invoices there.
Or we can work with direct payment, like via Paypal or Payoneer.

Yes, absolutely. We are all native US developers and work over 40hrs every week in US times.

We have 30+ developers and 20+ UI/UX designers in the team.

We use Slack for team communication, Github for code management and Trello, Jira, Linear for task management.

If we develop a mobile app from scratch, we check the app idea and finalize the entire features of the app first.
Based on that, we make wireframe and show the client. If client approves it, we make a final UI/UX design of the app with high quality resolution.
We build backend apis first and after that, develop mobile app front end and integrate with backend apis to complete the app.
Normally we launch the MVP version first if the client is fine, and add more features and fix issues to grow up more.