You will get Fix Bugs, Debug Errors & Improve Performance in Web or Mobile Apps
Project details
Hello! I’m Hamza Tahir, a professional Full Stack & Mobile App Developer with 5+ years of experience fixing bugs, debugging errors, and improving performance in websites and mobile applications.
If your website or app has errors, crashes, broken features, or performance issues, I can quickly identify the root cause and apply clean, long-term fixes.
I work with both existing codebases and live applications, ensuring your product runs smoothly without breaking other features.
What I Can Fix
✔ Website bugs & layout issues
✔ JavaScript, PHP & backend errors
✔ React, Vue, Node & Laravel bugs
✔ React Native & Flutter app crashes
✔ API & database issues
✔ Performance & loading problems
✔ UI/UX glitches & responsiveness issues
Technologies
• React.js, Vue.js, Next.js
• Node.js, Express.js
• PHP, Laravel, WordPress
• React Native & Flutter
• MongoDB, MySQL, SQL Server, Firebase
Why Choose Me?
✔ Clean & optimized fixes (not temporary hacks)
✔ Fast turnaround
✔ Clear communication on Upwork
✔ 30 days free support after fix
I help businesses and startups keep their applications stable, secure, and production-ready.
If your website or app has errors, crashes, broken features, or performance issues, I can quickly identify the root cause and apply clean, long-term fixes.
I work with both existing codebases and live applications, ensuring your product runs smoothly without breaking other features.
What I Can Fix
✔ Website bugs & layout issues
✔ JavaScript, PHP & backend errors
✔ React, Vue, Node & Laravel bugs
✔ React Native & Flutter app crashes
✔ API & database issues
✔ Performance & loading problems
✔ UI/UX glitches & responsiveness issues
Technologies
• React.js, Vue.js, Next.js
• Node.js, Express.js
• PHP, Laravel, WordPress
• React Native & Flutter
• MongoDB, MySQL, SQL Server, Firebase
Why Choose Me?
✔ Clean & optimized fixes (not temporary hacks)
✔ Fast turnaround
✔ Clear communication on Upwork
✔ 30 days free support after fix
I help businesses and startups keep their applications stable, secure, and production-ready.
Programming Languages
PHP, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, PSD to HTML, Performance OptimizationWhat's included
| Service Tiers |
Starter
$150
|
Standard
$300
|
Advanced
$550
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 7 days |
Number of Revisions | 1 | 2 | Unlimited |
Bug Investigation | |||
Fix Documentation | - | ||
Detailed Code Comments | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$50 - $150About Hamza
Senior Full Stack Web App & Mobile App Developer | Frontend | Backend
Karachi, Pakistan - 11:33 am local time
I deliver end-to-end web & mobile solutions using the MERN stack, React Native, and Flutter for IOS/Android — from architecture and APIs to polished UI, publishing, and post-launch support. I’ve built point-of-sale systems for US clients, event management & ticketing features, secure messaging (SecureLine), invoicing/PDF automation, and production-ready admin dashboards.
***Technologies I worked with***
🌐 Full Stack Web Development (Frontend)
Frameworks & Libraries: React.js, Next.js, Vue.js, Angular
UI Styling: Tailwind CSS, Bootstrap, Material UI, Styled Components
State Management: Redux Toolkit, Context API, Zustand, Recoil
Data Handling: Axios, SWR, React Query, Apollo Client
Testing: Jest, React Testing Library, Cypress
Other Tools: Vite, Webpack, Babel, ESLint
📱 Mobile App Development (Frontend)
Frameworks: React Native (CLI & Expo), Flutter
State Management: Redux, GetX, Provider, Bloc, MobX, Riverpod
Animations: Lottie, React Native Reanimated, Animated API
Navigation: React Navigation, Flutter Navigator 2.0
Native Modules: Camera, File System, Bluetooth, Maps, NFC
Features: Push Notifications, Real-time Chat, Payments, PDF Generation, Maps & Location
🖥️ Backend Development
Languages & Frameworks: Node.js (Express, Next.js), Laravel
Databases: MongoDB, PostgreSQL, MySQL, Firebase, Firestore & Realtime DB
Authentication: JWT, OAuth2.0, Firebase Auth, Auth0
API Design: RESTful APIs, GraphQL, JSON/XML
Integrations: Stripe, PayPal, Razorpay, Braintree, Twilio, Google Maps, Apple/Google/Facebook Logins
Payments & Wallets: Stripe, PayPal, Apple Pay, Google Pay, In-App Purchases
NFC Applications: Secure, real-time NFC-based apps (read/write, tap-to-pay, attendance systems)
Hosting: AWS, Firebase, Google Cloud, DigitalOcean
App store publishing, CI/CD setup, and post-launch maintenance.
Why Choose Me?
💡 Problem-Solving Developer: I turn your ideas into smart, easy-to-use mobile apps.
📞 Clear & Friendly Communication: Fast updates and open collaboration.
⏰ On-Time App Delivery: I deliver your mobile app on schedule, every time.
🎨 User-Friendly App Design: Simple and engaging mobile app design that users love.
🚀 Scalable Mobile Solutions: Apps built to grow with your business.
🔒 Secure App Development: Fast and reliable code, built with industry standards.
🔍 Attention to Every Detail: Smooth animations, clean layouts, and error-free apps.
📝 Clean Code & Documentation: Well-organized projects for easy future updates.
🤝 Free Maintenance & Support: 12 months of free support after launch.
✅ 100% Client Satisfaction: User-friendly mobile applications that clients love.
Typical Engagements:
1) MVP development (4–8 weeks)
2) Feature builds & integrations (1–6 weeks)
3) Production fixes & performance tuning (fast turnaround)
4) Ongoing maintenance & monthly retainer support
If you want: send your spec, Figma or wireframes, or a short description of the problem — I’ll reply with a short plan and realistic cost/time estimate.
Click Invite to start — I typically respond within a few hours.
Steps for completing your project
After purchasing the project, send requirements so Hamza can start the project.
Delivery time starts when Hamza receives requirements from you.
Hamza works on your project following the steps below.
Revisions may occur after the delivery date.
Bug/feature scope review
You’ll share repo access or describe the issue/feature. I’ll confirm feasibility.
Code analysis & plan
I review your setup, outline the fix, and schedule the work.