Browse categories
Explore
Fiverr Pro
English
$
USD
I will fix complex bugs in your react, next js, or node js application
Kaushik
About this gig
Are you staring at a blank screen, a console full of red errors, or a feature that just won't work?
Stop wasting hours stack-overflowing the same error. I specialize in diagnosing and fixing complex logic issues in MERN Stack and Next.js applications.
I don't just "patch" the code; I perform a Root Cause Analysis to ensure the bug is fixed permanently and your application remains stable.
I can help you resolve:
- React/Next.js Issues: Hydration errors, useEffect loops, State Management (Redux/Context), and Routing glitches.
- Backend Logic: Node.js/Express API failures, Middleware issues, and Auth flow (JWT/Session) breakage.
- Database: MongoDB connection errors and complex query fixes.
- Deployment: Docker container crashes and Vercel/Netlify build errors.
Why trust me with your code?
- Logic-First Approach: I understand the business flow, not just the syntax.
- Video Explanation: For complex fixes, I provide a Loom video explaining exactly why it broke and how I fixed it.
- Safe Handling: I work on local/staging environments to protect your live data.
My Tech Stack: React.js | Next.js | Node.js | TypeScript | MongoDB | Tailwind CSS | Docker | Postgresql | SQL | Prisma | Kubernetes
Get to know Kaushik
Kaushik
Full Stack Developer
- FromIndia
- Member sinceFeb 2026
- Avg. response time3 hours
Languages
English, Hindi
I build custom software that runs your business.
Most developers build websites; I build operational tools. I specialize in creating custom Web Applications (MERN/Next.js) that replace messy spreadsheets.
My Expertise:
Workflow Automation: Recently built a full Quote Management System for roofing contractors (Lead → Quote → Approval).
Complex Logic: I handle custom pricing formulas, PDF generation, and role-based dashboards.
Reliability: I use Docker and VPS to ensure your app is fast and secure.
Includes video training with every handover. Message me to discuss your project.
My Portfolio
FAQ
Can you fix the bug without seeing the code?
No. I need access to your GitHub repository or a zipped file of the code to diagnose the issue accurately.
What if the bug is bigger than expected?
The Basic package covers diagnosis. If the fix requires extensive rewriting, I will provide a detailed report and a Custom Offer to complete the repair.
Do you work on live production sites
I prefer to work on a staging environment or a local copy to ensure safety. We can deploy the fix together once it is tested.
