Markup
Responsive
Cross-browser/platform/device
XHTML/HTML/HTML5
CSS/CSS3
Pug/Jade
SASS/SCSS
XML/JSON
SVG
BEM (Block Element Modifier)
Bootstrap
JS
Vanilla Javascript
Prototype
jQuery
Ajax
Animation
GreenSock (GSAP)
ScrollMagic
KUTE.js
Debugging (local & remote)
Windows - Chrome/Firefox/Opera/IE/Edge
MacOS - Safari
Android - Chrome/Firefox/Android Browser
iOS - Safari
Front-end
Vue.js
Angular.js
React.js
mustache.js
webpack.js
SEO Performance
PageSpeed Insights
Back-end
Pure PHP
PHP OOP
Node.js
Python
Java (Spring Boot)
cURL
Web Services/RESTful API
Database analyst & design
Template Engine
Cached
Database
MySQL/MariaDB
PostgreSQL
MongoDB
ElasticSearch/OpenSearch
Framework
CodeIgniter
Laravel
WordPress
DevOps
AWS
K8S
S3/EFS
Monitoring
N8N
CI/CD
Container
Web Server
Apache
Nginx
Tomcat
Express.js
Environment
Docker
XAMPP/Vertrigo/Open Server (Localhost)
Others
Google Scripts
Google Services/APIs
Regex (Regular Expression)
Retina display
MS-DOS/Power Shell/Bash Shell (Script)