HTML / CSS:
HTML5, CSS3, Responsive Design, SASS / LESS.
JavaScript:
ES6+, jQuery, dynamic UI development.
Frontend Frameworks:
React, Vue.js (component-based UI development).
PHP:
Laravel, CodeIgniter, CakePHP, custom MVC frameworks, RESTful API development.
AJAX:
Asynchronous communication for interactive and fast-loading web applications.
Databases:
MySQL, MariaDB, SQL Server, schema design, query optimization, indexing.
Data Formats:
JSON, XML for API communication and mobile/web integration.
Design Patterns:
MVC, Singleton, Builder, secure coding (SQL Injection, XSS, CSRF protection), reusable modular architecture.
Servers:
Nginx, Apache, IIS, WampServer/XAMPP (local development).
Operating Systems:
Ubuntu, CentOS, Windows Server, Linux-based deployments via SSH.
DevOps / Virtualization:
Docker, Cronjobs, VMware ESXi, vSphere, VirtualBox.
Mobile Development:
Java (Native Android development), Android Studio, Xcode (iOS integrations).
Version Control:
Git (GitLab, GitHub), Beyond Compare for code review and deployment workflows.
VoIP / IP PBX:
Asterisk, 3CX, Elastix, SIP configuration, IVR routing.
IDE / Tools:
JetBrains (IntelliJ IDEA, PHPStorm), Postman, Photoshop, Sketch.