Kuba Werłos, Developer in Wrocław, Poland
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Kuba Werłos

Verified Expert  in Engineering

Software Developer

Wrocław, Poland
Toptal Member Since
August 29, 2022

Kuba has more than a decade of experience in PHP and relational databases. He has mainly built applications on the back end, from small startups to large and high-traffic projects. Kuba has worked as an independent developer and a team member and is currently freelancing to get an opportunity to work closely with changing business demands. Kuba is looking for a project where he will be able to help improve applications in various aspects, including features, performance, quality, and security.


PHP 7, MySQL, Microservices, Apache Kafka, PHP, Linux, PHPUnit, Static Analysis...
PHP 5, PHP 7, PostgreSQL, PHP, PHPUnit, Static Analysis, SOLID Principles...
PHP 7, Symfony, Yii, PHP, Linux, MySQL, PHPUnit, Static Analysis, jQuery...




Preferred Environment

PHP, Linux, PhpStorm

The most amazing...

...experience I've had is being a team leader of the team managing service and building two new services in PHP and React.

Work Experience

Principal Software Engineer

2020 - PRESENT
  • Developed enterprise-class applications to manage employee shifts in large stores and warehouses.
  • Built and maintained microservices in PHP and React with full responsibility over them.
  • Developed internal libraries to standardize code structure and style.
  • Provided technical leadership and support for the team.
Technologies: PHP 7, MySQL, Microservices, Apache Kafka, PHP, Linux, PHPUnit, Static Analysis, Symfony, SOLID Principles, Composer

PHP Developer

2019 - 2020
  • Developed PHP applications for the transportation of pharmaceutical products.
  • Migrated codebase from PHP 5 to PHP 7 and Composer.
  • Introduced a version control system in the subsidiary.
Technologies: PHP 5, PHP 7, PostgreSQL, PHP, PHPUnit, Static Analysis, SOLID Principles, jQuery, Composer

Senior Back-end Developer

2019 - 2019
  • Developed a PHP 7 application during the migration from YII to Symfony.
  • Provided technical guidance for less experienced colleagues.
  • Verified candidates for joining the company in the Polish office.
Technologies: PHP 7, Symfony, Yii, PHP, Linux, MySQL, PHPUnit, Static Analysis, jQuery, Composer

Senior Software Engineer

2017 - 2018
  • Developed a PHP and Zend framework for one product comparison website.
  • Managed customer communication and the developers' team.
  • Introduced quality assurance tools, including automated tests and static code analysis tools.
Technologies: PHP, Zend Framework, Linux, MySQL, PHP 7, PHPUnit, Static Analysis, Symfony, SOLID Principles, jQuery, Composer

PHP Developer

2016 - 2016
RST Software Masters
  • Supported and developed a legacy application for the transport industry.
  • Collaborated closely with stakeholders to quickly provide business value.
  • Worked in a team, together with over 20 other teams in Scrum.
Technologies: PHP, Linux, MySQL, SOLID Principles, jQuery, Composer

Software Developer

2012 - 2015
FINGO sp z oo
  • Developed an application from the project management area.
  • Created an international Magento online-shopping website.
  • Built a Symfony 2 project for comparing products' tests.
Technologies: PHP, MySQL, Symfony, Smarty, Magento, Linux, PHPUnit, jQuery, Composer

Junior Web Developer

2010 - 2012
  • Developed a PHP application for the recruitment industry.
  • Prepared database migration for over 160 customers.
  • Optimized application performance and fixed issues.
Technologies: PHP, MySQL

Enterprise Application to Work Management

An application to help manage employees in large-scale stores and warehouses. I was the technical leader of a team of five developers managing the creation and maintenance of services within the application. The application handled employees' data, including skills, work preferences, availability, salaries, and many more.

An eCommerce Application for Online Beauty and Self-care Retailers

A PHP and React application built using its own framework. I was a team member managing the shopping cart, adding new features in the A/B test approach, and fixing bugs and performance. I introduced new quality tools and taught other members good testing practices.

Family of Applications for Transport of Pharmaceutical Products

A PHP-based group of applications that transported pharmaceutical products from order to pharmacies and individual customers.

I was a small team member adding features, making bug fixes, and migrating to modern PHP versions while keeping a high service level agreement (SLA) for the system.
2008 - 2009

Student Exchange Program in Computer Science

Saarland University - Saarbrücken, Germany

2003 - 2009

Master's Degree in Computer Science

University of Wrocław - Wrocław, Poland


jQuery, React


Composer, PhpStorm, Jenkins


Symfony, PHPUnit, Yii, Zend Framework, Smarty


Object-oriented Programming (OOP), Microservices, Scrum, Kanban


PHP, PHP 7, PHP 5, JavaScript, HTML, CSS


MySQL, PostgreSQL, Databases


Linux, Apache Kafka, Magento, Docker


Static Analysis, SOLID Principles, Troubleshooting, Software Troubleshooting, Algorithms, Complexity Theory, Discrete Mathematics, Data Structures, Graphics, Image Processing

Collaboration That Works

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