Hi, I’m Sergei, a senior PHP engineer with 25 years in development. I repair what you already have on PHP, Laravel, Symfony or Yii, without a rewrite.
PHP Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /var/www/site/db.php
Your visitors see a blank page.
“Our developer disappeared, and he had all the passwords.”
“The host upgraded PHP and the site went down.”
“We’re scared to change anything. Old bugs keep coming back.”
“Payments, forms or integrations lose data, and nobody knows why.”
“AI built our site. Now it’s broken and nobody knows how it works.”
“Another contractor says we have to rewrite everything for €50k.”
from €100
I look at the problem and name the price before any work starts. It doesn’t change if the work takes me longer. If I can’t fix it, you don’t pay.
Scope unclear? Then I work by the hour at €45/h and agree the hours with you first.
I invoice after the result through my own company: SEPA or SWIFT, in EUR, the same way as any EU contractor. No card payments. No long-term contract.
| Marketplace freelancer | Agency | Me | |
|---|---|---|---|
| Who you talk to | Whoever took the job | Usually a manager | The person writing the code |
| Who does the work | Experience varies | Depends on who’s free | One senior, 25 years in development |
| Handoffs | New person for each job | Between team members | None |
| Time zone | Anywhere | Varies | CET |
Problem. A security problem in PHP made the client want to update PHP. The site was old: Yii 1 and PHP 5.6. After the update to PHP 8.2, everything broke.
What I did. I fixed the site modules that used old, removed options, and started everything on PHP 8.2.
Result. The security problem is closed, and the site works on a newer PHP version.
Problem. Public property search used the main MySQL database, so the search and the internal CRM were slow.
What I did. I moved the search to a separate MongoDB database and closed the main database to public traffic.
Result. The main database has much less load. The internal CRM is not slow anymore, and public search works fast.
Problem. Bad photos did not show the good sides of a property, so listings got fewer clicks on marketplaces. The company paid a photographer, and this was expensive and slow.
What I did. I added AI tools that improve photos, with ready presets.
Result. Photos look almost like studio photos, and the company spends much less money.
25 years in development, 15 of them in backend. I specialize in the parts of a system where mistakes cost money: payments, integrations.
I live in Serbia and work on CET with clients across the EU.
Yes. That’s the normal case.
Yes, if it’s PHP. I’ll read the code, tell you what state it’s in, and fix what’s broken.
Usually not. I fix what you have. If a part really should be replaced, I’ll tell you why, and the decision stays yours.
You create access for me to the repository and hosting, with only what the task needs, and revoke it whenever you like. If your previous developer holds the passwords, tell me: we’ll start from there.
You do, including everything I write for you.
I’m based in Serbia, outside the EU. I sign an NDA and a data processing agreement with EU standard contractual clauses on request.
By invoice after the result. I invoice through my own company: SEPA or SWIFT, in EUR. I don’t take cards.
Yes. After the first fix, I can stay on part-time as your PHP engineer. We’ll agree the terms when we get there.
You don’t pay. You still get what I found.
I’ll reply within 3 hours during CET business hours.
Prefer email? sergei@onviser.com
