1. Programming Languages
C (Fundamentals), C++ (OOP), Java (Enterprise), JavaScript (Web), Python (Versatile), Ruby (Web), TypeScript (Typed JS)
2. Data Structures & Algorithms
Arrays & Strings, Linked Lists, Stacks & Queues, Trees (Binary, BST, AVL), Graphs, Hash Tables, Dynamic Programming, Greedy Algorithms, Time & Space Complexity Analysis
3. Frontend Development
HTML5, CSS3 (Flexbox, Grid), JavaScript (ES6+), TypeScript, React.js, Vue.js, Angular, Redux, Material UI, Tailwind CSS, Webpack, Vite, Web Performance Optimization
4. Backend Development
Node.js (Express.js), Python (Django, Flask), Java (Spring Boot), PHP (Laravel), Databases (MySQL, PostgreSQL, MongoDB), Redis, RESTful APIs, GraphQL, Microservices Architecture
5. Full Stack Development
MERN Stack (MongoDB, Express.js, React, Node.js), MEAN Stack (MongoDB, Express.js, Angular, Node.js), NextJS, DevOps Tools, Version Control (Git), CI/CD, Testing (Unit, Integration)
6. Mobile App Development
Android (Java, Kotlin), iOS (Swift, SwiftUI), React Native, Flutter, Xamarin, Mobile UI/UX, App Store Deployment, Mobile App Security, Push Notifications
7. Machine Learning & Data Science
Python, NumPy, Pandas, Scikit-learn, TensorFlow, PyTorch, Data Visualization (Matplotlib, Seaborn), Statistical Analysis, Deep Learning, Natural Language Processing, Computer Vision
8. Cloud & DevOps
Linux System Administration, AWS (EC2, S3, Lambda), Azure, Google Cloud, Docker, Kubernetes, Jenkins, Terraform, Ansible, CI/CD Pipelines, Cloud Security, Monitoring & Logging