Maciej Ziolko, Developer in Kraków, Poland
Maciej is available for hire
Hire Maciej

Maciej Ziolko

Verified Expert  in Engineering

Bio

Maciej is a full-stack developer who specializes in WordPress. He has built complex WordPress websites and plugins, pushed WP to its boundaries, converted platforms from Squarespace to WordPress, optimized websites for best performance, security, and SEO, ran automated Selenium tests, and ensured work meets stringent data privacy regulations. Maciej's exceptional work has enabled client website performance levels to reach a 100/100 score in Google PageSpeed Insights while improving conversions.

Portfolio

Codete
PHP, JavaScript, Node.js, React, WooCommerce, WordPress Themes, CSS, HTML...
Sergeant AG
WordPress, Front-end, CSS, JavaScript, HTML
Bitlane
WordPress, PHP, JavaScript, Angular, WooCommerce, WordPress Themes, CSS, HTML...

Experience

PHP - 6 yearsWordPress - 5 yearsJavaScript - 5 yearsSass - 5 yearsREST APIs - 4 yearsWooCommerce - 4 yearsAvocode - 3 yearsTypeScript - 2 years

Availability

Part-time

Preferred Environment

MacOS, PhpStorm, Docker, Visual Studio Code (VS Code), Git, Business Requirements, Slack

The most amazing...

...and challenging project I have worked on was a custom CRM and CMS system built for fine art galleries.

Work Experience

Full-stack Technical Lead

2018 - PRESENT
Codete
  • Maximized real estate profits with my team by setting up 1-click solution WordPress landing pages with custom templates.
  • Fine-tuned a solution enabling medical facilities and patients to share encrypted medical data such as X-rays with doctors quickly.
  • Devised a custom CRM and CMS system built specifically for fine art galleries with my team.
  • Developed, launched, secured, and optimized WordPress websites.
Technologies: PHP, JavaScript, Node.js, React, WooCommerce, WordPress Themes, CSS, HTML, Responsive Web Design (RWD), WordPress, Business Requirements, cPanel

WordPress Full-stack Developer

2023 - 2024
Sergeant AG
  • Created and maintained a Wordpress Website. (https://firstresponder.gvz.ch/).
  • Used Flow as a task-tracking tool and Slack as a communication channel.
  • Implemented custom formulas based on the WPForms plugin.
Technologies: WordPress, Front-end, CSS, JavaScript, HTML

Software Engineer

2020 - 2022
Bitlane
  • Maintained dozens of WordPress websites with constant updates, security measures, and feature adjustments.
  • Built a fully functional podcast system synchronized with the most popular platforms, such as Google, Spotify, and Apple Podcasts.
  • Developed and launched multiple custom-made websites.
Technologies: WordPress, PHP, JavaScript, Angular, WooCommerce, WordPress Themes, CSS, HTML, User Interface (UI), User Experience (UX), Responsive Web Design (RWD), Divi, Business Requirements, UI Design, PSD

IT Consultant and Sales Manager

2018 - 2018
Totex
  • Developed a WordPress plugin to automatically connect published sale offers to the world's most popular providers (Mascus, Mobile.de, Autoline, and Otomoto).
  • Maintained the eCommerce platform and SEO/SEM aspects of the website.
  • Participated in Machinery Auctions, maintained good relationships with the clients, and gathered feedback to formulate better, more strategic UX on the website.
Technologies: WordPress, PHP, JavaScript, APIs, WordPress Themes, CSS, HTML, Responsive Web Design (RWD)

Web Developer

2015 - 2017
Freshview
  • Developed and launched WordPress and static websites.
  • Built a WordPress plugin to maintain hotel reservations.
  • Interviewed PHP developers and managed a team of junior WordPress engineers.
  • Worked with many different WordPress page builders, such as Elementor, Beaver, and Cornerstone.
Technologies: WordPress, PHP, JavaScript, WooCommerce, WordPress Themes, CSS, HTML, Responsive Web Design (RWD)

BDP Real Estate

https://beckerdaiberpartner.com/
I developed a WordPress template from scratch, extended standard CMS functionality using the ACF plugin, prepared pre-defined subpage templates for easier content editing, and optimized website performance reaching 100/100 score in Google PageSpeed Insights.

Talyo

https://talyo.de
I developed this WordPress template from scratch and implemented a multi-lingual solution. I coded various front-end animations at the client's request and optimized the website to meet data-privacy EU regulations.

Truck and Machinery Dealer Platform

I converted a code PSD template to a fully functional eCommerce platform. I developed a WordPress plugin to automatically connect published sale offers to the world's most popular providers (Mascus, Mobile.de, Autoline, and Otomoto) and optimized the website with strategic SEO.

CRM and CMS for Fine Art Galleries

I developed two connected platforms connected; a CMS system to present artists, viewing rooms, publications, and videos, and a CRM to maintain art gallery inventory and clients. I optimized the platforms for ADA compliance and conducted fully automated Selenium tests.

Blogging Platform Migration

I converted and migrated a child care blogging platform from Squarespace to WordPress, optimized the website for best performance, security, and SEO, and extended the standard WordPress functionalities to satisfy client needs.
2014 - 2018

Bachelor's Degree in Computer Science

AGH University of Science and Technology - Cracow, Poland

JULY 2023 - JULY 2026

AWS Certified Developer – Associate

Amazon Web Services

Libraries/APIs

WordPress REST API, REST APIs, WordPress API, jQuery, React, PayPal API, Node.js

Tools

PhpStorm, Figma, Zeplin, Avocode, Google Analytics, GitHub, Bitbucket, ACF PRO, Advanced Custom Fields (ACF), Git, Zapier, AWS ELB, AWS IAM, AWS CLI, AWS SDK, Slack

Languages

PHP, JavaScript, Sass, XML, CSS, HTML, HTML5, Less, TypeScript, C++

Frameworks

Symfony, Laravel, Bootstrap, Twig, Selenium, Divi, JSON Web Tokens (JWT), Angular

Paradigms

Agile, Scrum, Search Engine Optimization (SEO), Responsive Web Design (RWD), UI Design

Platforms

MacOS, WordPress, WooCommerce, Webflow, Shopify, WordPress Theme Design, Visual Studio Code (VS Code), cPanel, Docker, AWS NLB, AWS ALB, AWS Security Token Service (STS), Amazon Web Services (AWS), LAMP

Storage

MySQL, MongoDB, Amazon S3 (AWS S3)

Industry Expertise

Web Design

Other

Software Development, APIs, Elementor, CornerStone, Ajax, Gravity Forms, PSD to WordPress, WordPress Plugins, WordPress Themes, Front-end, User Interface (UI), User Experience (UX), Content Management Systems (CMS), Full-stack, Responsive UI, Communication, Business Requirements, HTML to WordPress, Mobile First, Web Development, Performance Optimization, QA Testing, API Connectors, Squarespace to WordPress, eCommerce, WordPress eCommerce, PayPal, Card Payments, Video Streaming, Payment APIs, CSS3 Animation, HTML5 Animations, PSD, BrainTree

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

1

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring