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Fiverr Pro
English
$
USD
I will fix react nextjs or nodejs bugs today
Cristian O
About this gig
Welcome to a premium, hand-coded development service!
Are you looking for an experienced engineer to fix critical bugs, build robust APIs, or expand your web app without relying on generic AI tools? I provide 100% custom, high-performance solutions tailored to your technical requirements.
With solid experience building scalable production apps and securing infrastructure, I focus on clean architecture, strict TypeScript typing, and reliable security.
What I can do for you:
Debug & fix frontend/backend issues in React, Nextjs, and Nodejs.
Integrate secure third-party APIs (PayPal, custom endpoints).
Build and optimize databases using Prisma ORM and PostgreSQL/MySQL.
Containerize your environments using Docker for seamless cloud deployment.
Deliver detailed code comments in English for easy maintainability.
Why choose my service?
NO AI-generated code or low-code builders: Every line is hand-coded by me.
Performance-driven: Optimized for low latency and modern server-side logic.
Let's make your product stable and scalable. Please contact me before placing an order to discuss your project specifications!
Get to know Cristian O
Cristian O
Fullstack Mobile Developer IT Infrastructure and Security Specialist
- FromChile
- Member sinceSep 2026
Languages
Spanish
I am a Software Developer specialized in the modern JavaScript and TypeScript ecosystem, including React, Next.js, and hybrid mobile development. I possess a robust hybrid profile with extensive experience leading IT infrastructure, data center administration, and cybersecurity as an ISO 27001 Internal Auditor. I design and deploy secure, optimized web and mobile applications using Docker and modern server-side logic.
Other Software Development Services I Offer
FAQ
Do you use AI tools like ChatGPT or Copilot to generate the code?
No. Every single line of code is handwritten by me using industry best practices. This ensures clean architecture, optimal performance, security, and a code base that is easy to maintain or scale without AI-generated bugs.
What do I need to provide before you start working on my project?
Depending on the package, I will need access to your GitHub repository, a clear description of the bug or feature, and any relevant API keys, database credentials, or environment files (ENV) required to replicate the setup locally using Docker.
Will the code be documented and easy to understand for my team?
Yes, definitely. For the Standard and Premium packages, I include detailed code comments in English. This guarantees that any developer who works on your project in the future will seamlessly understand the logic, architecture, and backend endpoints.
