Android App Development and MVVM Migration for Gift-Card Marketplace

We had an existing code base, and they helped us with the development by providing two Android developers and a project manager. They helped us with implementation and the technical architecture. They helped us to migrate to a new controller model and to build out our MVVM [Model-View-ViewModel] architecture. They've helped with notifications and authentication. Most of it has been the layout and design of views. They were originally given to us as a referral from another agency that didn't have time to take on the work we needed. At that time, we looked at a few other agencies. For this project, we had worked with them already and had enjoyed the experience, so we knew it was a good match. Once we filled this position, we kept them on because of their price. The Android project cost between $20,000 and $30,000 per month. The first project we did with them was November 2015 to July 2016. For this project, we began working with them in October 2016, and the work is ongoing.