Having worked on React.js for 3 years I specialize in building high-performance UI components and apps, especially those that need to juggle lots of dynamic content changing within the view (think Facebook or Instagram). On the front-end, I use a combination of HTML, CSS, and JavaScript to build everything a user sees and interacts with on a website. On the mobile side, I take advantage of React Native, to write apps in JavaScript that achieve native performance on mobile devices. Since React treats the view layer as a pure output of state, porting an app from web to mobile or vice versa is often a relatively simple affair, greatly reducing development times across a project. Since every part of an app made with React is a component, I create simple to complex UI components that can be added to existing apps, even those based on different technology stacks. So are you looking for React expert, contact me.