Oracle Java on Raspberry Pi. All future Raspbian images will ship with Oracle Java by default; existing users can install with apt-get.
Note
Mobile-Detect - a lightweight PHP class for detecting mobile devices. Works like $detect->isMobile() etc., very handy for choosing a frontend rendering strategy based on this info.
в MobiDev (Харьков, Украина)
Code in Ruby and Elixir, but still love PHP. Explore ES6 and Vue.js. Explore databases, use Ubuntu and MacOS, think about IT people and management