Object-oriented programming, Java, C++, Python, JavaScript, Node.js, Express.js, Spring Boot, Django, Flask, React.js, Angular, Vue.js, React Native, Flutter, Swift, Kotlin, RESTful APIs, MySQL, PostgreSQL, MongoDB, Firebase, Git, GitHub, GitLab, Laravel, Ruby on Rails, WordPress, Joomla, Drupal, WooCommerce, Shopify, Magento, Figma, Adobe XD, Sketch, mobile-first design, SEO, cross-browser compatibility, AWS, Google Cloud, Microsoft Azure, Docker, Jenkins, Kubernetes, CI/CD, Terraform, Ansible, Heroku, Netlify, Python libraries, Pandas, NumPy, Matplotlib, TensorFlow, Keras, PyTorch, Power BI, Tableau, SQL, VPN, SSL, TLS, ethical hacking, OWASP, IAM, IT infrastructure monitoring, business intelligence, data warehouse, KPI