You will get your React or Next.js bugs fixed quickly and professionally
Top Rated
Top Rated
Project details
I will fix bugs, errors, and issues in your React or Next.js application quickly and reliably.
If your application is broken, behaving unexpectedly, or failing in production, I will identify the root cause and resolve it with clean, maintainable solutions—not temporary fixes.
This service is ideal for startups, SaaS products, and businesses that need dependable debugging without delays or poor communication.
What I can fix:
UI bugs and layout issues
API and data fetching errors
Authentication and state issues
Performance problems
Build and deployment errors
Why clients choose this service:
Clear and consistent communication
Proper debugging and long-term fixes
Experience working with real production systems
Reliable delivery based on agreed scope
If your application is broken, behaving unexpectedly, or failing in production, I will identify the root cause and resolve it with clean, maintainable solutions—not temporary fixes.
This service is ideal for startups, SaaS products, and businesses that need dependable debugging without delays or poor communication.
What I can fix:
UI bugs and layout issues
API and data fetching errors
Authentication and state issues
Performance problems
Build and deployment errors
Why clients choose this service:
Clear and consistent communication
Proper debugging and long-term fixes
Experience working with real production systems
Reliable delivery based on agreed scope
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$50
|
Standard
$120
|
Advanced
$250
|
|---|---|---|---|
| Delivery Time | 1 day | 2 days | 5 days |
Number of Revisions | 2 | 3 | 5 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Frequently asked questions
11 reviews
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This project doesn't have any reviews.
GG
Gustavo G.
Apr 8, 2026
AI Platform Improvements — Query Fan-Out, Source Tracking & Prompt Management
Working with Onyekachukwu was a great experience. He quickly understood the complexities of our AI platform and delivered high-quality improvements across query fan-out analysis, source tracking, and prompt management.
The features were implemented cleanly and efficiently, especially the handling of large datasets and the improved source classification system. The new bulk prompt actions also made the platform much easier to use.
Communication was clear and professional throughout, and all tasks were delivered on time.
Onyekachukwu is a reliable developer, and I would gladly work with him again.
The features were implemented cleanly and efficiently, especially the handling of large datasets and the improved source classification system. The new bulk prompt actions also made the platform much easier to use.
Communication was clear and professional throughout, and all tasks were delivered on time.
Onyekachukwu is a reliable developer, and I would gladly work with him again.
MT
Michael T.
Mar 20, 2026
Tech Stack Audit and Platform Transition Support
NR
Naima R.
Dec 23, 2025
Project Discovery & Technical Onboarding — Retention OS (5 hours)
Onyekachukwu did an excellent job during this discovery and onboarding milestone.
He took the time to understand the product vision, architecture, and documentation, and provided clear, thoughtful feedback. His questions were relevant, his analysis structured, and his recommendations helped identify gaps early and strengthen the foundation for development.
Communication was smooth and professional, and his written feedback was clear and actionable. This milestone delivered exactly what it was meant to: clarity, alignment, and readiness to move forward.
I would highly recommend Onyekachukwu for SaaS projects requiring strong analytical thinking and solid technical judgment.
He took the time to understand the product vision, architecture, and documentation, and provided clear, thoughtful feedback. His questions were relevant, his analysis structured, and his recommendations helped identify gaps early and strengthen the foundation for development.
Communication was smooth and professional, and his written feedback was clear and actionable. This milestone delivered exactly what it was meant to: clarity, alignment, and readiness to move forward.
I would highly recommend Onyekachukwu for SaaS projects requiring strong analytical thinking and solid technical judgment.
MK
Makoto K.
Dec 17, 2025
Looking for a react + supabase developer for saas completion
poor skill, zero communication
NR
Naima R.
Dec 8, 2025
Supabase Backend + Resend Email Setup for SaaS (Lovable frontend)
This is my second time working with Onyekachukwu, and once again he delivered exceptional work. He is fast, highly skilled, and always focused on finding the best and cleanest solution. His communication is excellent, he understands requirements immediately, and he consistently goes above and beyond to make sure everything works perfectly.
Working with him is effortless and truly pleasant — he is reliable, proactive, and deeply committed to quality. I’m extremely happy with the results and will definitely continue working with him.
A top-tier developer I recommend without hesitation.
Working with him is effortless and truly pleasant — he is reliable, proactive, and deeply committed to quality. I’m extremely happy with the results and will definitely continue working with him.
A top-tier developer I recommend without hesitation.
About Onyekachukwu
Full Stack React Developer | Next.js | Reactjs | AI Integration
92%
Job Success
Onitsha, Nigeria - 12:04 am local time
I'm a full-stack developer specializing in Next.js, React, TypeScript, and Supabase.
Some of my recent work includes DolomiteAI, a multi-tenant AI brand visibility platform with automated monitoring pipelines and a scoring engine that generates actionable visibility recommendations. I also built DionyxSMS, a multi-tenant school management SaaS with role-based access control, geofenced attendance tracking, and live driver tracking using Supabase Realtime and Leaflet.
Top Rated on Upwork • 92% Job Success Score • 24 completed jobs.
Clients usually reach out to me when they're looking for someone who can:
• Handle both the frontend and backend without constant supervision.
• Turn an AI-generated or low-code application into a stable, production-ready product.
• Design secure databases, implement proper Row Level Security policies, and build authentication that works reliably.
• Take ownership of the project and communicate clearly throughout development.
What I can help you build
Full-Stack Web Applications
Complete web applications built with Next.js, React, TypeScript, Supabase, PostgreSQL, and Node.js.
SaaS Platforms
Multi-tenant SaaS applications with role-based access, subscription features, and complex business workflows. I've designed and built production SaaS platforms from the ground up.
AI Integrations
Applications powered by OpenAI and Anthropic, including monitoring systems, recommendation engines, workflow automation, and other AI features designed for real-world use.
Mobile Applications
React Native (Expo) and Flutter applications, including shared notification systems across mobile and web platforms.
Backend and Database Architecture
Supabase and PostgreSQL backends with well-structured databases, secure authentication, Row Level Security policies, API development, and integrations with services like Stripe and Resend.
Tech Stack
Frontend
Next.js, React, TypeScript, Tailwind CSS, React Native, Flutter
Backend
Supabase, PostgreSQL, Node.js, Express
Integrations
Stripe, Resend, OpenAI, Anthropic, REST APIs, Webhooks
Tools
Git, GitHub, Vercel, Cloudflare
When we work together, you can expect:
• Well-structured, maintainable code.
• Clear communication and realistic timelines.
• Thoughtful architecture that's easy to extend as your product grows.
• Someone who can take ownership from database design through deployment.
• Experience improving and stabilizing AI-generated and low-code applications that have outgrown their original foundations.
If you're building a SaaS platform, MVP, dashboard, or AI-powered application, send me a brief overview of your project. I'll review your requirements and get back to you with a realistic approach, expected scope, and the best way to move forward.
Steps for completing your project
After purchasing the project, send requirements so Onyekachukwu can start the project.
Delivery time starts when Onyekachukwu receives requirements from you.
Onyekachukwu works on your project following the steps below.
Revisions may occur after the delivery date.
Step 1: Review Requirements
I review your issue, codebase, and requirements to understand the root cause.
Step 2: Debugging & Fix Implementation
I identify the problem and implement a clean, maintainable fix.