JavaScript, TypeScript, React, Redux, Stencil, Node.js, Electron, Hapi, Socket.io, Webpack, Babel, Gulp, jQuery, HTML, CSS, Bootstrap, WebExtensions, Python, Django, Django REST Framework, Flask, Twisted, Pascal, Lazarus, Delphi, VCL, C, Assembler, Scheme, Oberon, Lua, PHP, CodeIgniter, HTTP, WebSocket, Web Scraping, REST, PostgreSQL, MySQL, SQLite, MS SQL, MongoDB, Redis, Git, Redmine, Jira, Windows, DOS, Linux, Algorithms, Data Structures, OOP, Design Patterns, FP, Multithreading