Node.js2 years experience
I default to Node backend for web development and python for IOT. I have used different major frameworks and databases. ReactJs, Angular, karma, Gulp, Grunt, Webpack...
Built world standard products using a combination of these technologies and conversant with the pro's and con's of each front-end framework.
Testing3 years experience
writing test driven development is such a good practice I have used over and over again. It might seem slow but in the long term it pays off.