Sandor Czettner, Developer in Glasgow, United Kingdom
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Sandor Czettner

Verified Expert  in Engineering

Software Developer

Glasgow, United Kingdom
Toptal Member Since
March 16, 2018

Sandor is a senior PHP developer with over a decade of in-depth experience. He possesses expert knowledge in Magento and of both back-end and front-end frameworks like Laravel, Symfony, Zend. Knockout.js, Backbone.js, and Mustache. Sandor joined Toptal in order to find remote work and the opportunity to work with people who mirror his values of professionalism, attention to detail, efficiency, and are driven by performance.


Magento, Magento 2, Magento Extension Development, Knockout (Knockout.js)
PHP, Shopify, Node.js, BigCommerce
Cohesion Digital Ltd.
Microsoft Azure, Magento 2, Magento 1




Preferred Environment

PhpStorm, Git, Percona, MySQL, NGINX, Apache, Linux

The most amazing...

...thing I’ve implemented was a Hitachi PaybyFinance Magento integration for Magento 1 and Magento 2.

Work Experience

Magento 2 Expert

2023 - 2023
  • Worked on the connection of the subscription service through a proprietary API, implemented changes, and maintained an extension for the latest versions of Magento.
  • Integrated the subscription extension with 3rd party payment gateways, such as Adyen.
  • Followed best practices for Magento extension development.
Technologies: Magento, Magento 2, Magento Extension Development, Knockout (Knockout.js)

Senior Software Engineer

2018 - 2021
  • Worked with some large clients and was also introduced to other eCommerce platforms, such as Shopify and BigCommerce.
  • Helped migrate stores between Shopify, Magento, and BigCommerce.
  • Implemented AWS Lambda functions to accommodate serverless APIs for Magento and BigCommerce.
  • Implemented various import/export procedures using Node.js (await, async).
Technologies: PHP, Shopify, Node.js, BigCommerce

Lead Software Developer

2015 - 2018
Cohesion Digital Ltd.
  • Led the team in PaybyFinance integration for Magento 1 and Magento 2.
  • Worked with UI components, Knockout, and React and helped a few great junior developers start their software engineering careers.
  • Built automated tests using Behat and PHPUnit (MTF).
Technologies: Microsoft Azure, Magento 2, Magento 1

Senior Software Developer

2011 - 2015
Healthy Websites
  • Implemented cloud hosting on AWS with Docker. I designed and implemented extensions for Magento.
  • Acquired a Magento Certified Developer certification.
  • Worked as a Magento solution architect and front-end developer.
Technologies: Drupal, Magento, PHP, Laravel

Magento Developer

2011 - 2011
Rockforth Kft
  • Developed with Magento; further details about my work with Magento can be found in my portfolio.
  • Implemented a sound sample extension for Magento.
Technologies: Drupal, Magento

Software Developer

2010 - 2011
Ringnet Holding
  • Built the election results' visuals for a TV station based on an XML feed provided by the government.
  • Developed and customized Magento websites.
  • Built intranet systems to help order processing and account management.
Technologies: Ruby on Rails (RoR), PHP, C++

Software Developer

2009 - 2010
Kodak Media
  • Implemented an eCommerce customization for the site in Magento.
  • Supported order processing software and Magento development.
Technologies: Drupal, Magento

PaybyFinance for Magento 1

Starting from the ground up, I led the team that handled the integration of PaybyFinance to Magento 1.

PaybyFinance for Magento 2

From the very beginning, I led the team that integrated PaybyFinance to Magento 2. I handled the entire process from including the UI components and the automated tests with Behat and PHPUnit (MTF).

Cotswold Design

I managed the responsive design and custom development for B2B retailer store in Magento 1. The design uses Sass and Gulp for build processes and is deployed using Capistrano.

Jewelry Site | Customizations in the Look and SEO

I implemented the customization to change this site's look and feel and also to improve their search engine optimization (SEO).

It was a nice experience to arrive home and immediately see a huge billboard showing the logo of a client I that worked for. I'm looking forward to helping many other clients to achieve the same results.

Kodak Media CIB Bank Gateway

I implemented a payment gateway to Magento using CIB Bank's gateway.

Telecommunication | ERP Integration

I integrated a wholesale eCommerce store with the client's in-house ERP system via a SOAP API. This included order processing, stock management, custom prices, and payment on account.

Sea Freight Industry

I integrated an eCommerce store with a home-brew ERP system that included eBook downloads and license keys, orders, and stock synchronization.

Car-parts Warehouse

I fixed the issues on a website after the previous development team had abandoned the project. The performance of the store increased tenfold and the template was cleaned up. In this project, Sass was introduced, and Git was used for clean deployments (Capistrano).

Let’sTalkGroup is a leading organizer of international seminars, courses, and events including high-profile in-company training and consulting services.

My role in 2009 was as a Drupal developer working singlehandedly on this project. This included handling the PSD designs, writing detailed requirement specifications as well as communicating with the client.

The site is still being used in it's original form.

Magento Certifications

• 2012 Magento Developer Certificate
• 2013 Magento Front-end Developer Certificate
• 2014 Magento Solution Specialist
• 2015 Magento Developer Plus

Subscription Magento Extension
A subscription module for Magento 2. Customers can pay once and receive goods on a subscription basis. Payments are handled either using Magento tokens or their internal card tokenization.

I made the extension compatible with the latest version of Magento 2 and updated the Adyen module so customers can pay using Adyen instead of the internal payment gateway. I also did various bug fixes and resolved JavaScript errors.
2007 - 2010

Incomplete Bachelor's Degree in Electrical Engineering and Information Technology

Óbuda University - Budapest, Hungary

2003 - 2007

Diploma in Business And Information Technoogy

Kutvolgyi High School of Business And Information Technoogy - Budapest, Hungary


jQuery, Underscore.js, Mustache, React, Backbone.js, Node.js


Google Analytics, Vim Text Editor, Jira, RabbitMQ, Sublime Text 3, Git, Behat, NGINX, Apache, PhpStorm


Zend Framework, Knockout (Knockout.js), Laravel, Symfony 4, Symfony 2, Ruby on Rails (RoR), PHPUnit


PHP 7, Ruby, PHP 5, Less, Sass, PHP, C++, C#




Magento, Magento 2, Magento Enterprise, Magento 1, Magento Extension Development, Magento Community Edition, Drupal, Linux, Percona, Kubernetes, Android, Shopify, BigCommerce


MySQL, Redis, Memcached, MongoDB, PostgreSQL, Oracle SQL


APIs, eCommerce, Microsoft Azure, PWA, Progressive Web Applications (PWA)

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