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Fiverr Pro
Nederlands
$
USD
I will fix bugs in your node js python or dotnet backend and API
Cong Cuong
5,0
5,0
Over deze dienst
I debug and fix backend and API issues in Node.js, Python, and .NET/C#. You get the fix AND a plain English explanation of what actually went wrong.
WHAT I FIX
- APIs returning errors, wrong data, or nothing at all
- Authentication, JWT, session and CORS bugs
- Database issues: slow queries, deadlocks, failed migrations
- Broken integrations: payments, webhooks, OAuth, email
- "Works on my machine" deployment and environment bugs
- Memory leaks, timeouts, race conditions
STACK
Node.js (Express, NestJS), Python (FastAPI, Django, Flask), C#/.NET Core, SQL Server, PostgreSQL, MySQL, MongoDB, Docker
WHY ME
- 6+ years debugging real production systems under real pressure
- You get a root-cause explanation, not just a patched file
HOW IT WORKS
1. Message me the error, your stack, and repo access
2. I confirm I can fix it and quote you BEFORE you pay
3. You order, I fix, you get the fix plus prevention advice
Maak kennis met Cong Cuong
Cong Cuong
Full Stack Developer: DotNET, Nodejs, React, DevOps
- Afkomstig uitVietnam
- Lid sindsjan 2024
- Gem. reactietijd6 uur
- Laatste levering1 jaar
Talen
Vietnamees, Engels
I'm a full-stack developer with 6+ years building production systems in healthcare, education and business management.
I work across the whole stack — .NET, Python, Node.js, React, Angular, SQL Server, PostgreSQL — and handle everything from database design and architecture to deployment and monitoring.
Whether you need a system built from scratch, a new feature, a bug fixed or a slow app made fast, I'll propose the approach that actually fits your needs.
Mijn portfolio
Veelgestelde vragen
I'm not sure which package I need. What do I do?
Message me first. Send the error message and your stack, and I'll tell you honestly which package covers it. If it's smaller than you thought, I'll say so.
Do you need access to my repository?
Yes, for most bugs. GitHub/GitLab collaborator access is ideal. A zip works too. I'm happy to sign an NDA.
What if you can't fix it?
I check feasibility before you order, so this is rare. If I take the order and genuinely can't solve it, I'll cancel and you get a full refund.
Reviews
1 reviews van deze dienst
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R randy0116
Singapore
Cong Cuong truly impressed with a flawless and well-documented delivery that showcased exceptional professionalism. Working with him was a breeze, given his quick responsiveness and excellent language fluency. He consistently went above and beyond, making the entire experience delightful! 🙌
US$ 200-US$ 400
Prijs
12 dagen
Looptijd
C 
Reactie van de freelancer
Nuttig?
Reviews
1 reviews van deze dienst
| (1) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Specificering van de beoordeling
- Communicatieniveau van de freelancer
- Kwaliteit van de levering
- Waarde van de levering
Sorteer op
Meest relevant
R randy0116
Singapore
Cong Cuong truly impressed with a flawless and well-documented delivery that showcased exceptional professionalism. Working with him was a breeze, given his quick responsiveness and excellent language fluency. He consistently went above and beyond, making the entire experience delightful! 🙌
US$ 200-US$ 400
Prijs
12 dagen
Looptijd
C Reactie van de freelancer
Nuttig?
