Frontend
Angular 2+, TypeScript, SASS, LESS, HTML5, CSS3, jQuery, React
Cloud Services
AWS EC2, S3, CloudFront, Lambda
Programming Language
JavaScript, Ruby, Python, Go
DevOps tools
Chef, Docker, Jenkins, Ansible
SQL Databases
MySQL, PostgreSQL
NoSQL Databases
MongoDB
Web Frameworks
Rails, Django
Operating Systems
Ubuntu 12.04+, CentOS 6-7, MacOS, FreeBSD, Windows 10, Window Server 2016
Testing Frameworks
Jasmine, Protractor, Karma, Minitest, RSpec