• Frontend development with React or Next.js
• Backend development with Node.js, NestJS, or Express
• REST API and GraphQL API development
• PostgreSQL, MySQL, MongoDB, and database design
• Authentication, roles, permissions, and user management
• Admin dashboards and reporting panels
• Payment integrations like Stripe
• Third-party API integrations
• File uploads, notifications, emails, and background jobs
• Deployment with AWS, Docker, Nginx, and CI/CD
• Performance, security, and maintainability improvements