I will fix bugs and optimize your react, nextjs, nodejs, or backend app

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foreverinlaw
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foreverinlaw
Sergei Morozov
fix bugs and optimize your react, nextjs, nodejs, or backend app
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fix bugs and optimize your react, nextjs, nodejs, or backend app

About this gig

Hello, I can help you fix bugs, errors, performance issues, and deployment problems in your web application or backend system.


I work with React, Next.js, Node.js, TypeScript, Python, Go, REST APIs, databases, Docker, Vercel, AWS, and VPS deployments.


What I can fix:


Frontend Bugs: React, Next.js, TypeScript, UI issues, broken components.

Backend Bugs: Node.js, Python, Go, API errors, authentication issues.

Database Issues: PostgreSQL, MongoDB, MySQL, Redis queries and connection problems.

Performance Issues: Slow pages, slow API responses, inefficient queries.

Deployment Errors: Vercel, Docker, VPS, AWS, environment variables, build errors.

Integration Problems: Stripe, Telegram, Discord, webhooks, and third-party APIs.


Why choose me?


I debug carefully and explain the issue clearly.

I focus on clean, safe, and maintainable fixes.

I can improve performance, not just patch the problem.

You will receive regular updates during the process.


Please contact me before ordering and share the issue details, error logs, and code access if available

  • Platform

    • Other

  • Website type

    • E-Commerce store
    • Business
    • Landing page
    • Saas
    • Other

  • Programming language

    • Go
    • JavaScript
    • Python
    • TypeScript
    • HTML & CSS
    • React
Respect third-party rights

Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.

Get to know Sergei Morozov

Sergei Morozov

FullStack and Bot Developer

  • FromPoland
  • Member sinceJun 2025
  • Avg. response time1 hour

  • Languages

    English, Polish, Russian
Expert Full-Stack & Bot Developer. I build modern web apps (Next.js/TS) and advanced Telegram bots (Python/Node.js). My expertise: • Web: High-performance UI/UX, SEO-ready landing pages, and responsive dashboards. • Bots: AI integration, payments, moderation, and automation tools. • Backend: Robust APIs, PostgreSQL/Mongo, and Dockerized deployments. I focus on clean code, optimization, and long-term maintainability. You get clear communication and production-ready infrastructure. Let's bring your idea to life!

My Portfolio

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