This site was designed with a golden ratio grid using a PostCSS layout plugin I made that mimics much of CSS Grid Spec but works seamlessly in IE9; developed with Jekyll because the billion static-site generators made me dizzy 🤕; and deployed to Netlify (SSL, HTTP2, CDN) with DNSimple.
I could use some more work on ARIA roles, microdata, localStorage, but I'm generally pretty good at this.
I understand semantic markup and actually have a lightweight spin-off of HTML boilerplate that works well with a plethora of browsers.
I have a really deep knowledge of CSS, preprocessors, and PostCSS.
I know ES6+; functional concepts like mapping, reducing, etc.; promise usage to avoid pyramids of doom; some design patterns; code style with ESLint (StandardJS is currently my favorite flavor); strong typing with Flow/TypeScript; modularizing code with imports/exports; etc.
I've built a lot of custom tools with Node. It's one of my favorite things to do. I'm very familiar with the API and at least know what standard libs to search through for answers to particular questions.
I've used streams and spun up HTTP servers/APIs with Express, but I wouldn't consider myself super comfortable with them yet. I'm currently working on this.