I currently use React Native (developed by Facebook) to develop native look and feel cross device mobile applications. This is primarily what I do for my clients, along with building a mobile-friendly websites. The difficult part is creating elements that look the same across devices, and I've had a lot of practice developing a system to building cohesive applications for my clients. The best part of the experience is working closely with my clients to ensure that I'm delivering a product that they expect. I also work with my clients, helping them understand the development process and things that they might want to consider when building a web and mobile application. There has never been a more exciting time for developers building applications for their clients, and I look forward to leveraging my skills to produce the application of your dreams.