I will fix bugs and errors in your nextjs react or nodejs web app

M
michael_katskiy
M
michael_katskiy
Michael K
fix bugs and errors in your nextjs react or nodejs web app
Full Screen
fix bugs and errors in your nextjs react or nodejs web app
Full Screen
Full Screen
fix bugs and errors in your nextjs react or nodejs web appfix bugs and errors in your nextjs react or nodejs web appfix bugs and errors in your nextjs react or nodejs web app

About this gig

Is your Next.js, React or Node.js app throwing errors, breaking in production, or behaving differently than it should? I'll find the root cause and fix it properly, not just patch the symptom.

I'm a full-stack TypeScript developer with 5+ years of commercial experience, most recently owning production features and on-call support for an AI video-ad platform (Next.js, Node.js/NestJS, Google Cloud, Firebase, MongoDB).

What I fix:

  • Runtime and build errors, hydration and rendering issues in Next.js and React
  • Broken API routes, failing requests and data bugs in Node.js, Express or NestJS
  • Firebase, Firestore, MongoDB and PostgreSQL query or permission issues
  • Deployment problems on Vercel, Google Cloud or AWS
  • Apps built with AI tools (Lovable, Bolt, Cursor) that break outside the demo

How it works:

  1. Message me before ordering with a short description of the problem.
  2. I confirm what's included and the right package.
  3. You get the fix, a short explanation of the cause, and tips to prevent it.

  • Programming language

    • JavaScript

  • Expertise

    • Debugging
    • Performance
    • Security
    • Databases
    • Testing procedures

  • Frontend framework

    • Next.js
    • React.js
    • Tailwind CSS

  • Backend framework

    • Express.js
    • NestJS
    • Next.js
    • Node.js
    • Firebase

Get to know Michael K

Michael K

Full Stack TypeScript Developer, NextJS, NodeJS, LLM Integration

  • FromUkraine
  • Member sinceMar 2023
  • Avg. response time1 hour

  • Languages

    English, Russian, Ukrainian
Full-stack TypeScript developer with 5+ years of commercial experience: Next.js and React front ends, Node.js/NestJS APIs, and cloud on GCP, Firebase and AWS. At an AI video-ad startup I owned features end to end, built Stripe billing and LLM features with structured outputs, and wrote a migration engine that cut processing time by up to 95%. I can add AI to your product, take an AI-built app to production, or ship new features. Based in Ukraine, I adjust my hours to overlap with yours and confirm every decision in writing.

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