I started as a front-end web developer as a fresh college grad, and then slowly worked my way down the stack over the years. These days I'm pretty good across the board, from pixel pushing CSS and HTML and building highly interactive web pages with vanilla JS or React, to building server logic, to deploying new infrastructure on AWS.
Here's some of the stuff I do fairly well:
html, css, handlebars, jquery, react, react native, js, node, python, php, mysql, nginx, git, bash, ec2, elb, docker/ecs