1. Strong proficiency in React.js and its core principles (hooks, functional components, lifecycle methods, etc.).
2. Experience with Redux, Redux Toolkit, or other state management libraries.
3. Solid understanding of JavaScript (ES6+), including async/await, closures, and event handling.
4. Expertise in CSS3, SASS/SCSS, and responsive design techniques.
5. Experience working with RESTful APIs, GraphQL, and third-party services.
6. Proficiency in modern front-end build tools (Webpack, Babel, Vite, or Parcel).
7. Familiarity with version control systems (Git, GitHub, GitLab, Bitbucket).
8. Experience with cross-browser testing and debugging.
9. Understanding of performance optimization techniques (lazy loading, memoization, virtualization, etc.).
10. Basic knowledge of security best practices (CORS, CSRF protection, authentication methods).