Jacek Z.

Jacek Z.

PHP Developer

Top performer 10/10
Poland
Trusted member since 2021
16 years of experience

With a strong background in leadership, Jacek spent three years as a technical team leader, where he successfully guided teams and ensured seamless project execution. His open-minded approach, organizational skills, and problem-solving mindset enable him to tackle complex challenges effectively.

During his studies, Jacek was selected for the prestigious Google Summer of Code program, distinguishing himself among hundreds of applicants and further demonstrating his technical expertise and dedication to software development.

Main expertise

MySQLMySQL16 years
ScrumScrum10 years
AgileAgile12 years
GitGit16 years
11+

Experience9

Nordhealth

Software Engineer

Nordhealth
Healthcare IT
Jun 2025 - Jan 2026 · 7m

Jacek worked on a large-scale healthcare platform, improving backend functionality, system quality, and engineering reliability. A significant part of his work focused on identifying performance bottlenecks, optimizing database queries, and improving indexing strategies to enhance system responsiveness and scalability. He also collaborated closely with developers and QA to review pull requests, strengthen testing practices, refine release processes, and resolve production issues, contributing to safer deployments and higher overall quality standards.

PHPPHP
LaravelLaravel
MySQLMySQL
GitGit
Amenitiz

Software Engineer

Amenitiz
Travel Booking
Mar 2024 - Jun 2025 · 1y 3m

Jacek worked on a WordPress-based web project for a hospitality SaaS company, balancing technical quality with measurable business impact. He partnered closely with the marketing team to implement campaign tracking, analytics integrations, and website changes supporting paid acquisition and conversion goals. At the same time, he improved website performance and front-end efficiency to enhance load speed, reliability, and overall user experience.

PHPPHP
MySQLMySQL
JavaScriptJavaScript
WordPressWordPress
Musti Group

Senior Software Developer

Musti Group
Pets and Animal Care
Jun 2021 - Mar 2024 · 2y 9m
  • Participated in the development of an eCommerce platform, creating new functionalities using PHP and JavaScript.
  • Transitioned to rebuilding the platform with React.js and Next.js to improve performance and user experience.
PHPPHP
JavaScriptJavaScript
React.jsReact.js
HTMLHTML
Next.jsNext.js

Senior Software Engineer

Teams By Sunscrapers
Information Technology (IT) and Services
Mar 2021 - Jun 2021 · 3m
  • Served as Lead Backend Developer for a US-based startup focused on helping people fall asleep.
  • Managed the backend of a mobile application that allowed users to join live sleep sessions with a guide to help them relax and fall asleep.
  • Built functionality to serve live stream URLs from AWS and handle video transcoding after each session.
  • Developed a CMS for managing sleep sessions and user accounts.
PHPPHP
LaravelLaravel
AWSAWS
HTMLHTML
Trimetis Services

Senior Software Developer

Trimetis Services
Information Technology (IT) and Services
Apr 2020 - Jan 2021 · 9m
  • Developed a web application that allowed users to record video testimonials.
  • Designed and implemented major new features for an internal CMS.
PHPPHP
LaravelLaravel
HTMLHTML
WordPressWordPress
Jakdolece

Founder / Lead Developer

Jakdolece
Travel Booking
Jan 2020 · 6y 3m
  • Fully coded Jakdolece.pl, a start-up offering unbeatable travel deals for flights and hotels worldwide, from frontend to backend.
  • Leveraged data analysis to ensure the platform continuously updated with the most affordable prices, keeping all offers competitive around the clock.
PHPPHP
YiiYii
MySQLMySQL
JavaScriptJavaScript
Data Analytics

Technical Team Lead/Senior SoftwareEngineer

Fibar Group
Home Automation
Aug 2014 - Mar 2020 · 5y 7m
  • Led a team of programmers.
  • Planned implementation schedules and prioritized tasks.
  • Developed solution designs and architecture.
  • Built and maintained Manufacturing Execution System (MES) and Enterprise Resource Planning (ERP) systems.
  • Maintained traceability and tracking throughout the manufacturing process.
  • Built and improved REST APIs.
PHPPHP
YiiYii
LaravelLaravel
HTMLHTML
CodeIgniterCodeIgniter
REST APIREST API
Merixstudio

Web developer

Merixstudio
Information Technology (IT) and Services
Aug 2012 - Aug 2014 · 2y

His main tasks included PHP5 (Drupal 7), Python (Django) and frontend development (HTML5, CSS3, jQuery).

PHPPHP
HTMLHTML
WordPressWordPress
DrupalDrupal

Web Application Developer

MDA Systems
Aerospace and Defense
Jan 2012 - Jul 2012 · 6m

Building web applications - PHP5 object-oriented programming.

PHPPHP
CakePHPCakePHP
HTMLHTML

Assessments

Engineering excellence

Jacek’s overall performance in a 90-minute live technical assessment ranks in the top 15% of vetted PHP Developers at Proxify.

Education

Poznan University of Technology
Poznan University of Technology
Data Processing Technology2009 - 2010
Poznan University of Technology
Poznan University of Technology
Computer Science/Data ProcessingTechnology2005 - 2009

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