Umair KHATTAK

Flutter & Full-Stack Developer | Mobile Apps | Web Apps | NestJS Backend
Hi! I’m a Software Engineer with 3+ years of development experience, specializing in mobile applications, web applications, backend development, API integrations, and application testing. I can work on complete projects as well as small fixes, improvements, and existing applications.
???? Flutter Mobile App Development
• Android & iOS apps using Flutter and Dart
• Figma/design to responsive Flutter UI
• Firebase, authentication & REST API integration
• New features and existing app customization
• Flutter bug fixing & performance improvements
???? Full-Stack Web Development
• Custom web applications & business solutions
• Angular, JavaScript & TypeScript development
• Dashboards, admin panels & responsive interfaces
• Backend and database integration
• Existing web app improvements & bug fixing
⚙️ NestJS Backend & REST APIs
• Secure and scalable NestJS REST APIs
• Authentication & authorization
• PostgreSQL, SQL & database integration
• Third-party API and Firebase integration
• Backend debugging, validation & error handling
???? Website & App Testing
• Website, web app & mobile app testing
• Functional and usability testing
• Responsive UI and important user-flow checks
• Bug identification and reproduction
• Playwright-assisted testing where appropriate
???? Bug Fixing & Small Development Tasks
• Flutter and web application bug fixes
• API integration and connectivity issues
• Authentication & Firebase problems
• Adding screens, features or functionality
• Debugging and improving existing applications
???? Technologies
Flutter • Dart • Angular • NestJS • TypeScript • JavaScript • Firebase • PostgreSQL • SQL • REST APIs • C++
I focus on clean and maintainable code, reliable functionality, clear communication, and practical solutions. Whether you need a complete application or just help with a specific bug or feature, I’m available for both long-term projects and smaller development tasks.