I will rescue your ai broken store or website

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fullstackwizzar
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fullstackwizzar
Marcin Stanczyk

About this gig

Did an AI tool or "vibe-coding" build you a store that looks done but breaks in production 500 errors, broken checkout, payments that don't complete, security holes? I fix what the AI got wrong.


I'm a senior full-stack engineer (6+ yrs, 125k+ lines of production WooCommerce/PHP) who runs a real store at 120-150K visits/month. I've spent my career on exactly the parts AI gets wrong: payments, concurrency, security, data integrity.


WHAT I FIX

  • 500 errors / white screens in production
  • Broken or failing checkout & payments
  • Orders that don't save or don't mark paid
  • Security holes (exposed keys, injection, no validation)
  • Data saving wrong or not at all
  • Code no one can safely change


HOW IT WORKS

  1. Send the error or broken flow + access
  2. I reproduce it and find the real cause
  3. I fix it, harden it, and prove it works live


WooCommerce, Shopify, WordPress, custom PHP/Node/React.

For a bigger rebuild, message me I'll scope it and send a custom offer.

Send the exact error + a link/screenshot and I'll tell you straight if I can fix it.

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 Marcin Stanczyk

Marcin Stanczyk

Ecommerce Expert

  • FromPoland
  • Member sinceMar 2026
  • Languages

    Polish, Spanish, English
E-Commerce owner with 3+ years experience in online sales development. Full-Stack DevOps with 7+ years building high-performance websites and e-commerce platforms. Specialized in WordPress, WooCommerce, React, and Next.js. RESULTS: My WooCommerce store reached 1M PLN revenue in 9 months through custom automation, performance optimization, and technical SEO with record-breaking 2027 orders in December 2025. I focus on clean code, intuitive user experience and measurable business results. Let's schedule a google meet call (15-30 min) to understand your issues and talk about solutions!

My Portfolio

Other Website Maintenance Services I Offer