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Software Development HTML5, CSS3Advanced JavaScript (Vanilla, ES5, jQuery, NodeJS, AngularJS and more)Advanced Python (2, 3, Django, asyncio and more)JavaC/C++ System Administration Debian-based distributionsRHEL-based distributionsGentooFreeBSDShell scriptingPython scriptingDockerSoftware (cross-)compiling and debuggingVarious HTTP server software like Apache HTTPD, NGINX, Apache Tomcat, etc.PHP-FPM, uWSGI, NodeJSKVM Virtualization (libvirt)MySQL, PostgreSQL, Redis (basic setup and...