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Fiverr Pro
English
$
USD
I will fix, optimize and speed up your website
Nitin Kumar
About this gig
Is your website slow, buggy, unresponsive, or not working properly?
I will fix, optimize and speed up your website to improve performance, responsiveness and user experience.
What I can help with:
Website speed & performance optimization
React & Next.js bug fixing
JavaScript, HTML & CSS issues
Mobile responsiveness fixes
API & backend issues
Database and API optimization
Page loading improvements
UI/functional bugs
Deployment & build errors
Third-party API integrations
I work with React, Next.js, TypeScript, JavaScript, Node.js, Express.js, MongoDB and PostgreSQL.
Why work with me?
Clean and maintainable code
Performance-focused solutions
Responsive across desktop and mobile
Clear communication
Proper testing before delivery
Whether you need a quick bug fix, website speed optimization, or multiple issues resolved, I can help.
Message me before ordering if you have a complex project or multiple issues.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Nitin Kumar
Nitin Kumar
Innovating for a Better Future
- FromIndia
- Member sinceApr 2026
- Avg. response time1 hour
Languages
English, Hindi
Hi, I'm Nitin, a Full-Stack & AI Engineer specializing in AI website development, AI web apps, AI chatbots, and custom software.
I build fast, modern, responsive, and scalable solutions for startups, businesses, and individuals.
What I can build:
• AI-powered websites & web apps
• AI chatbots & API integrations
• Full-stack applications
• AI SaaS & MVPs
• Dashboards, authentication & databases
• Deployment and ongoing support
Tech: React, Next.js, TypeScript, Node.js, Python, FastAPI, MongoDB, PostgreSQL, and AI APIs.
Message me to discuss your idea!
FAQ
What type of websites do you work with?
I work with custom websites and web applications, including React, Next.js, JavaScript and full-stack applications.
Can you fix React or Next.js bugs?
Yes. I can troubleshoot frontend issues, JavaScript errors, UI problems, API issues and other React or Next.js problems.
Can you improve my website speed?
Yes. I can identify performance bottlenecks and optimize areas such as JavaScript, CSS, images, API requests and frontend rendering.
Can you make my website mobile responsive?
Yes. I can fix layout, spacing, navigation and other responsive issues across different screen sizes.
Can you fix backend or API problems?
Yes, depending on the technology and issue. I work with Node.js, Express.js, APIs, MongoDB and PostgreSQL.
Can you fix deployment issues?
Yes. I can investigate common deployment and hosting-related issues involving the application, build process, environment variables and configuration.
Will you work on an existing website?
Yes. You can send me your existing project and explain the issues you are experiencing.
Can you handle multiple bugs?
Yes. Standard and Premium packages include multiple issues. For larger projects, please message me first so I can recommend the right package.
Do you work with WordPress?
No. This Gig focuses on custom websites and modern web technologies rather than WordPress.
