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$
USD
I will fix your spring boot java bugs and errors fast
M.Mansoor
About this gig
Are you facing bugs, performance issues, API errors, or need new features added to your existing web application?
I will help you fix, develop, optimize, and improve your frontend and backend applications with clean, scalable, and production-ready solutions.
With 3+ years of software development experience, I have worked on SaaS platforms, marketplaces, dashboards, enterprise systems, and complex backend architectures.
Services I provide:
Backend Development
REST API development & fixes
Database issues & optimization
Authentication & security fixes
Payment & third-party API integrations
Performance improvements
Microservices development
Frontend Development
UI bug fixing
Responsive design improvements
API integration
New feature development
Technologies:
Backend:
Java, Spring Boot, Spring MVC, Spring Security, Node.js, Express.js, NestJS, FastAPI
Frontend:
React.js, Angular, JavaScript, TypeScript, Thymeleaf
Database & Tools:
PostgreSQL, MySQL, MongoDB, Redis, Docker, Kafka, Git
Why choose me?
Clean code
Scalable architecture
Professional communication
Long-term support
Let's fix, improve, and scale your application.
Get to know M.Mansoor
M.Mansoor
AI and Full Stack Engineer, AI Chatbots, LLM Apps, Java Spring Boot, Web Apps
- FromPakistan
- Member sinceApr 2020
- Last delivery3 months
Languages
Urdu, English
AI is at the heart of what I build. I create AI agents, RAG chatbots and LLM apps (OpenAI, Gemini, LangChain) that let businesses chat with their own data, plus the web apps, custom software and SaaS backends around them.
A major bank and multinational FMCG brands trust my code in production. I ship fast using modern AI coding tools.
Stack: Java Spring Boot, Python FastAPI, Node, React, Next.js, Postgres, Qdrant, Docker, AWS.
5.0 rated, 1-hour response. Tell me your idea and I'll turn it into a clear plan, price and timeline.
My Portfolio
FAQ
What do you need from me to start?
A description of the bug or feature, any error messages or logs, and access to your code (GitHub, GitLab, or a zip). I will review it and confirm scope and timeline before starting.
My issue is not listed. Can you still help?
Most likely yes. If it involves Java, Spring Boot, Node.js, FastAPI, React, or Angular, message me and I will tell you quickly whether I can fix it.
How do I know the fix will not break something else?
I test the affected flows after every change and explain the root cause and exactly what I changed, so you get a clean, verifiable fix rather than a quick patch.
