My main focus is on JavaScript and its related frameworks. Below I list them in more detail. REACT - react-hooks, create-react-app, routing using react-router (v4), state management via Context, testing via Jest/Mocha with ReactTestUtils/Enzyme, component lifecycle methods, presentational/container components, CSSTransitionGroups for animation, props checking, Material UI, optimization etc. NODE/EXPRESS - routing, middleware, Nodemailer for mailing, Passport.js for authentication, Mongoose for MongoDB, concurrency model/event loop, testing using Mocha etc. GENERAL FRONTEND - JavaScript, HTML5, CSS /CSS3 DATABASES - MongoDB, Firebase WORKFLOW: Git/GitHub for version control,