Muhammad K.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Oct 17, 2026.

I’m a Senior Full-Stack Software Engineer with 10+ years of experience building, improving, testing, and maintaining web applications and software solutions. I work across the complete software development lifecycle from understanding business requirements and designing the right technical approach to development, API integration, testing, debugging, deployment, and ongoing maintenance. I have worked with both new and existing applications, including developing new features, integrating frontend and backend systems, troubleshooting technical issues, improving application performance, and maintaining reliable production applications. My Core Technical Expertise Frontend Development Angular TypeScript JavaScript HTML5 CSS Responsive and user-focused web interfaces Backend Development: Java Spring Boot REST APIs Backend business logic Frontend & backend integration API development and integration Database: MySQL PostgreSQL SQL Database integration and data handling Full-Stack Development: End-to-end web application development Frontend & backend integration Feature development and enhancement Third-party/API integrations Existing application improvements Software Testing & QA: Manual QA Functional testing API testing Regression testing Test planning and execution Test automation Automated regression testing Bug identification and verification Maintenance & Engineering Support: Bug fixing Troubleshooting Production issue investigation Performance optimization Application maintenance Existing system enhancement Application quality improvement How I Can Help: Whether you’re building a new application or working with an existing system, I can support you with: ✅ Full-Stack Web Application Development ✅ Angular Frontend Development ✅ Java & Spring Boot Development ✅ REST API Development & Integration ✅ Database Integration ✅ Manual QA & Software Testing ✅ API & Regression Testing ✅ Test Automation ✅ Bug Fixing & Troubleshooting ✅ Application Maintenance & Enhancement ✅ Performance Optimization ✅ Existing Application Support I’m comfortable joining a project at different stages whether you need someone to build a web application from scratch, develop new features, integrate APIs, resolve technical issues, improve performance, or strengthen the testing process. My Approach: I start by understanding the business requirements, project goals, and technical expectations. From there, I focus on delivering solutions that are clean, maintainable, reliable, and practical for long-term use. I also believe successful software development is more than writing code. Clear communication, proper testing, thoughtful debugging, and attention to application quality are equally important. 🤝 My goal is to understand what you’re trying to achieve, solve the technical challenges effectively, and deliver software that supports your business needs. Let’s build, improve, test, or maintain your application with a structured and reliable approach.