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I will fix bugs and errors in your react nextjs, nodejs app fast
Toseef Hasan
About this gig
Are you stuck with annoying bugs, API errors, crashes, or unexpected behavior in your React, Next.js, or Node.js app?
I will quickly identify and fix critical issues in your frontend or backend, cleanly and professionally.
With strong experience in full-stack JavaScript applications, I can help you resolve:
- React rendering issues
- Next.js SSR & routing problems
- API integration errors
- Node.js backend crashes
- Database query bugs
- Authentication & JWT issues
- Performance bottlenecks
- Deployment & build errors
- Production-only bugs
I focus on writing clean, maintainable fixes, not temporary patches.
Why should you choose me?
- Fast response time
- Clear communication
- Deep debugging skills
- Clean and optimized code
- Performance-focused solutions
Before placing an order, please message me with details about the issue.
Let's fix your app properly and fast.
Get to know Toseef Hasan
Toseef Hasan
Senior Full Stack Developer NodeJS NestJS React SaaS Architect
- FromPakistan
- Member sinceNov 2019
- Avg. response time1 hour
Languages
English
Hi, I’m Toseef Hasan, a Senior Full-Stack Engineer & Tech Lead with 7+ years of experience building scalable SaaS platforms, marketplaces, and backend-heavy systems for startups and international clients.
I specialize in Node.js, NestJS, React, and Next.js, with a strong focus on clean architecture, performance, and long-term scalability. I’ve led development teams, designed microservices-based systems, integrated secure payment flows (Stripe & subscriptions), and delivered production-grade applications across fintech, healthcare, and Web3-enabled platforms.
My Portfolio
Other Software Development Services I Offer
FAQ
What types of bugs can you fix?
I specialize in resolving issues with JavaScript, Node.js, React, Next.js, and Tailwind CSS, and I’m also experienced with many other web development technologies. Whether it’s a layout issue or a JavaScript error, I’m here to help.
Can you fix security vulnerabilities?
Absolutely. I identify and patch SQL injection, XSS, auth bypasses, and insecure API endpoints.
Can you fix production server issues?
Yes, including deployment and environment-related bugs.
Do you optimize performance as well?
Yes. I can identify bottlenecks and improve backend & frontend performance.
What if you can't fix the bug?
If I can't resolve it within the quoted scope, you pay nothing. No risk to you.
What happens if a bug reappears after you have fixed it?
If a bug reappears after it has been fixed, we will investigate and resolve the issue as soon as possible at no additional cost to you.
Will fixing bugs affect other parts of my website?
I take extra care to ensure that bug fixes won’t disrupt your site’s functionality. I will back up any affected code before making changes and test thoroughly to avoid new issues.
What information do you need to start?
Access to code repository, error logs, and clear explanation of the issue.
