* Programming languages: Python, Java, C#, JavaScript, SQL
* Web development: HTML, CSS, JavaScript, PHP, WordPress
* Database management: MySQL, PostgreSQL, MongoDB
* Cloud computing: AWS, Azure, Google Cloud Platform
* Machine learning: scikit-learn, TensorFlow, PyTorch
* Data analysis: pandas, NumPy, matplotlib, seaborn
* Version control: Git
* Agile development: Scrum, Kanban