Algorithm
Language
Groovy
Haskell
JavaScript
Jinja2
LaTeX
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Python
Regular Expression
CSS/Sass/SCSS
Shell Script
SQL
Framework
Bootstrap
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Database
MongoDB
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API Development
RESTful API
GraphQL API
Documentation
Authentication | Authorization
JWT (JSON Web Tokens)
OAuth 2.0
DevOps
Ansible
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Web Design
Template | UI Kit
Web Icon
SEO
Git
GitBook
Text Editor
Atom
Sublime Text 3
Vim
misc.
Shell | Terminal
Fish
Zsh
iTerm2