You will get React, Next.js or Node.js Bug Fixes & Code Improvements Done Fast
Top Rated
Top Rated
Project details
Code broken? Previous developer left a mess? Performance issues? I fix it.
44 projects. 100% Job Success. Top Rated Plus. 6,000+ hours on Upwork.
I jump into React, Next.js, Node.js, and Python codebases, find the problem, and deliver clean fixes fast.
[WHAT I FIX]
• Bugs and crashes in React or Next.js apps
• API integration failures and backend errors
• Performance and loading speed issues
• State management problems (Redux, Context, Zustand)
• Authentication and security issues
• Deployment and CI/CD pipeline failures
• Database query optimization (PostgreSQL, MongoDB)
• TypeScript migration and type errors
• Python backend and Flask API issues
[WHY START SMALL]
Many of my long-term clients started with a quick bug fix. They liked the code quality and communication, then came back for larger projects. My longest client engagement: 578 hours with a single client who started with a small task.
[BEST FOR]
• Anyone stuck on a React, Next.js, Node.js, or Python bug
• Teams whose developer left mid-project
• Startups with tech debt slowing them down
• Companies needing a fast fix before a launch
Starts at $99. Tell me what's broken - I respond within hours.
44 projects. 100% Job Success. Top Rated Plus. 6,000+ hours on Upwork.
I jump into React, Next.js, Node.js, and Python codebases, find the problem, and deliver clean fixes fast.
[WHAT I FIX]
• Bugs and crashes in React or Next.js apps
• API integration failures and backend errors
• Performance and loading speed issues
• State management problems (Redux, Context, Zustand)
• Authentication and security issues
• Deployment and CI/CD pipeline failures
• Database query optimization (PostgreSQL, MongoDB)
• TypeScript migration and type errors
• Python backend and Flask API issues
[WHY START SMALL]
Many of my long-term clients started with a quick bug fix. They liked the code quality and communication, then came back for larger projects. My longest client engagement: 578 hours with a single client who started with a small task.
[BEST FOR]
• Anyone stuck on a React, Next.js, Node.js, or Python bug
• Teams whose developer left mid-project
• Startups with tech debt slowing them down
• Companies needing a fast fix before a launch
Starts at $99. Tell me what's broken - I respond within hours.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$99
|
Standard
$249
|
Advanced
$599
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 10 days |
Number of Revisions | 3 | 4 | 5 |
Number of Pages | 5 | 7 | 10 |
Design Customization | - | ||
Content Upload | - | - | |
Responsive Design | - | ||
Source Code |
Optional add-ons
You can add these on the next page.
Additional Page
(+ 1 Day)
+$30
Design Customization
(+ 1 Day)
+$50
Responsive Design
(+ 1 Day)
+$50Frequently asked questions
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MK
Mohammed K.
Jul 30, 2026
Full-stack Development - React with Python and FastAPI
MK
Mohammed K.
Jul 30, 2026
Full-stack Development - React with Python and FastAPI
MK
Mohammed K.
Jun 27, 2026
Full-Stack Developer Needed (React + Vite / Python FastAPI)
JF
Juan Carlos F.
Feb 13, 2026
Full stack developer
A very professional, high-quality job. I’m very happy with the service.
MM
Mark M.
Jul 17, 2025
Front End Developer Code Design System Components
Rashvin did a great job will work wiht him again and recommend him to anyone.
About Rashvin
Full Stack React & Next.js Developer | AI Integration | SaaS & Web App
100%
Job Success
Surat, India - 7:31 am local time
I build production web applications and AI-powered platforms that real businesses depend on. Not landing pages. Not prototypes. Products that handle users, process data, and scale.
[RECENT PROJECT]
ResearchCollab.ai - I designed and built the full-stack architecture for an AI-powered research platform used by PhD students, journalists, and researchers. Integrated OpenAI, Gemini, DeepSeek, and Perplexity to power intelligent research workflows. Solo full-stack build: Next.js frontend, Python backend, PostgreSQL database.
[WHAT I BUILD]
▪ SaaS Platforms - dashboards, billing, user management, analytics
▪ AI-Powered Products - LLM integration, chatbots, AI workflows, RAG pipelines
▪ Web Applications - responsive, fast, production-grade React and Next.js apps
▪ Telehealth & Healthcare Platforms - HIPAA-aware, WebRTC, real-time video
▪ API & Backend Systems - Node.js, Python, FastAPI, REST, authentication
[MY STACK]
React | Next.js | TypeScript | Node.js | Python | FastAPI | PostgreSQL | Supabase | MongoDB | Firebase | Tailwind CSS | REST APIs | OpenAI | Gemini | LLM Integration
[HOW I WORK]
I take full ownership. I don't wait for instructions - I understand your goals, flag risks early, ship clean code, and communicate at every step. Git, CI/CD, code reviews, agile. Comfortable working solo or embedded in your team.
[BEST FIT FOR]
▪ Startups building or scaling a web product
▪ Companies adding AI features to existing applications
▪ Agencies needing a senior full-stack dev for client projects
▪ Teams who want one reliable developer instead of managing three
Currently available for long-term engagements. Send me your project details or a quick description of what you need - I'll respond with honest feedback on the best approach.
Full Stack Developer, React Developer, Next.js Developer, Node.js Developer, Python Developer, TypeScript, AI Web App, LLM Integration, ChatGPT Integration, SaaS Developer, FastAPI, PostgreSQL, Supabase, MongoDB, MERN Stack, Tailwind CSS, Frontend Developer, Backend Developer, Web Application, REST API Developer, AI Integration, Gemini API, Full Stack Web Development
Steps for completing your project
After purchasing the project, send requirements so Rashvin can start the project.
Delivery time starts when Rashvin receives requirements from you.
Rashvin works on your project following the steps below.
Revisions may occur after the delivery date.
Review & Diagnose the Issue
I review your codebase, reproduce the bug, and identify the root cause. I confirm the fix approach with you before making any changes to your live code.
Fix, Test & Verify
I implement the fix, test thoroughly, and make sure it doesn't break anything else. Minimal, clean changes - I only touch what needs fixing.