You will get a reliable bug fix for your Node.js, NestJS, React, or Next.js application
Project details
Is something broken in your Node.js, NestJS, React, or Next.js application? I will investigate the issue, identify the root cause, and implement a clean, reliable fix.
I’m a Senior Full-Stack Developer with 7+ years of commercial experience working with production applications and high-load systems used by millions of users.
I can help with:
• Node.js and NestJS backend bugs
• React and Next.js frontend issues
• REST API errors and integrations
• PostgreSQL and database-related problems
• Authentication and authorization issues
• TypeScript errors
• Performance problems
• Build and deployment errors
• Third-party API integration bugs
• Existing and legacy codebases
My goal is not just to hide the error, but to understand the root cause and fix it without introducing new problems.
Tech stack: Node.js, TypeScript, NestJS, React, Next.js, PostgreSQL, Redis, Docker, REST APIs.
If you're unsure which package fits your issue, feel free to message me before ordering.
I’m a Senior Full-Stack Developer with 7+ years of commercial experience working with production applications and high-load systems used by millions of users.
I can help with:
• Node.js and NestJS backend bugs
• React and Next.js frontend issues
• REST API errors and integrations
• PostgreSQL and database-related problems
• Authentication and authorization issues
• TypeScript errors
• Performance problems
• Build and deployment errors
• Third-party API integration bugs
• Existing and legacy codebases
My goal is not just to hide the error, but to understand the root cause and fix it without introducing new problems.
Tech stack: Node.js, TypeScript, NestJS, React, Next.js, PostgreSQL, Redis, Docker, REST APIs.
If you're unsure which package fits your issue, feel free to message me before ordering.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance OptimizationWhat's included
| Service Tiers |
Starter
$29
|
Standard
$49
|
Advanced
$99
|
|---|---|---|---|
| Delivery Time | 1 day | 2 days | 3 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 3 | 5 |
Design Customization | |||
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Frequently asked questions
About Kirill
Full-Stack Developer | Node.js, NestJS, React, PostgreSQL
Batumi, Georgia - 4:50 pm local time
I’m a Senior Full-Stack Developer with 7+ years of commercial experience. I’ve worked on high-load products serving millions of users, including an application that reached 6M+ users and 1M+ monthly active users.
I can help you with:
• Fixing bugs in existing Node.js, NestJS, React, and Next.js applications
• Developing backend services, REST APIs, and third-party integrations
• Building React and Next.js interfaces
• Designing and optimizing PostgreSQL databases
• Improving performance, reliability, and maintainability
• Adding OpenAI and other AI-powered functionality
• Building Telegram bots and Mini Apps
• Deploying applications with Docker, Nginx, and CI/CD
I’m comfortable joining unfamiliar or legacy codebases, working with incomplete documentation, and investigating problems where the root cause isn’t immediately obvious.
Core stack: Node.js, TypeScript, NestJS, React, Next.js, PostgreSQL, Redis, Docker, REST APIs, and WebSockets.
Recent production experience includes:
• Backend systems handling 500+ requests per second
• Applications serving 6M+ users
• Databases containing 100M+ records
• AI-powered services built with OpenAI APIs
• Financial, Web3, VPN, analytics, and Telegram products
My goal is to deliver a practical, production-ready solution without introducing unnecessary complexity.
Send me a brief description of your project or issue, and I’ll tell you how I would approach it.
Steps for completing your project
After purchasing the project, send requirements so Kirill can start the project.
Delivery time starts when Kirill receives requirements from you.
Kirill works on your project following the steps below.
Revisions may occur after the delivery date.
Step 1 — Analyze & reproduce the issue
I review the code, reproduce the issue, analyze logs/errors, and identify the root cause.
Step 2 — Implement the fix
I implement a clean fix while minimizing changes to unrelated parts of your application.