In a recent project, I developed a task management web application using React for the front end and Node.js with Express for the back end. I utilized MongoDB for database management to store user tasks and authentication details. The application featured user authentication, task creation, and real-time updates. I also integrated RESTful APIs to handle data exchange between the client and server. This project enhanced my skills in full-stack development and taught me the importance of clean, maintainable code and effective debugging techniques.

To ensure web application security, I implement HTTPS to encrypt data in transit and use secure authentication methods like OAuth or JWT. I sanitize user inputs to prevent SQL injection and XSS attacks. Regularly updating dependencies and libraries helps mitigate vulnerabilities. Additionally, I conduct security audits and penetration testing to identify and fix potential threats. Following best practices like role-based access control and secure session management further strengthens the application's security.

When debugging, I start by replicating the issue and reviewing error logs to pinpoint the problem. I use browser developer tools and debugging tools like Chrome DevTools or VS Code's debugger. For back-end issues, I check server logs and API responses. I also write unit tests to isolate bugs and ensure code reliability. Collaborating with team members and documenting the debugging process helps resolve issues efficiently and prevents recurrence.

I have extensive experience using Git for version control. I regularly create branches for new features, commit changes with descriptive messages, and merge them after thorough testing. I use platforms like GitHub and GitLab for collaboration, resolving merge conflicts, and reviewing pull requests. Git has been instrumental in maintaining code integrity, tracking changes, and facilitating teamwork in my projects.

To optimize performance, I minimize HTTP requests by bundling and compressing assets. I use lazy loading for images and implement caching strategies like CDNs and browser caching. On the back end, I optimize database queries and use indexing to reduce load times. Profiling tools like Lighthouse help identify bottlenecks. Regularly monitoring performance metrics ensures the application remains fast and responsive for users.