- React Native Hybrid Android & iOS I am a experienced technical leader and developer of mobile applications for over 7 years and I have worked in several large companies in Brazil such as Banco Original, PagSeguro UOL, Crefisa, Atlas Quantum, and others. I have been trained by the best of mobile application development in Brazil. My focus is on delivering high quality work (check my portfolio) and I expect to be working with high quality clients. We are doing all the refinements before starting the development so that both of us have a clear understanding of your needs.