Kris Powelski, Software Developer in Poznań, Poland
Kris Powelski

Software Developer in Poznań, Poland

Member since September 29, 2014
Kris is a passionate developer with an air of prodigy about him. He programmed his first video game at the age of ten and dove into web development soon after. Kris loves to work with international teams to experience the world at his desktop and be a part of exciting projects.
Kris is now available for hire


  • CauseLabs
    React, WordPress, PHP 7, JavaScript, Sass, Amazon Rekognition
  • Duolingo
    Bootstrap, Sass, Python, JavaScript, React
  • MCH Group
    Amazon Web Services (AWS), AWS, CSS, HTML5, JavaScript, Vue.js, PHP, Laravel 5



Poznań, Poland



Preferred Environment

Sublime Text 3, Git, MacOS

The most amazing...

...contributions I've made were to challenging projects for Rogers where I got to visit their headquarters in Toronto.


  • Senior Full-stack Developer

    2020 - 2021
    • Implemented user experience techniques using React With Redux making the project smooth and appealing for the end user.
    • Created a back-end API with headless WordPress for a wide range of features on both the user and administrative side.
    • Employed Amazon's Rekognition API to read objects on the photos.
    Technologies: React, WordPress, PHP 7, JavaScript, Sass, Amazon Rekognition
  • Senior Full-stack Developer

    2019 - 2020
    • Created multiple A/B tests for design choices and logic, using React, Redux, and Python to improve sales performance and ease of use.
    • Assisted in developing the English Test UI using React by implementing a wide range of features, including audio functionality.
    • Joined the acquisition team to improve login and registration flow, using OAuth 2.0 for 3rd-party services integration.
    • Improved performance of the development process by optimizing the client's user tools.
    • Suggested multiple UI changes to improve engagement and general impression.
    Technologies: Bootstrap, Sass, Python, JavaScript, React
  • Laravel Developer

    2018 - 2018
    MCH Group
    • Created three separate portals for artwork management.
    • Developed a back end to use third-party services (like Cloudinary) efficiently and to save costs.
    • Worked with several maps APIs to deliver the most flexible address matching experience.
    • Designed the UI for smooth artwork matching.
    • Created an extraordinary authentication workflow.
    Technologies: Amazon Web Services (AWS), AWS, CSS, HTML5, JavaScript, Vue.js, PHP, Laravel 5
  • WordPress Developer

    2018 - 2018
    • Created an interactive tool for school guidance.
    • Developed a feature to manage education stats for each part of the USA.
    • Worked on the back end to improve the admin user experience.
    Technologies: CSS, HTML5, JavaScript, PHP, WordPress
  • API Developer

    2017 - 2017
    Origin Broadband
    • Worked with the large SOAP API of a leading British telecommunications company.
    • Converted an unstandardized web service to a RESTful API.
    • Developed an SDK for other developers to use for easier API integration.
    • Made the code plug-n-play to make sure application's growth becomes easily integrated in the API.
    • Investigated the telecom industry to provide the best API solutions.
    Technologies: MySQL, Laravel, SOAP, REST
  • API and Management Tools Developer

    2016 - 2017
    Social Sweethearts
    • Created an administration tool for Facebook ad generation.
    • Created an API for automated Facebook ad synchronization.
    • Customized tools to achieve optimal ad cost and reach.
    • Performed automated A/B ad testing.
    • Guided other developers to integrate the new API to existing platforms.
    Technologies: jQuery, JavaScript, Laravel, PHP, Facebook API
  • Web Developer

    2015 - 2015
    D&D Company
    • Created a WordPress plugin to allow smooth Facebook to Google Analytics communication. This product is able to automatically read stats from all your Facebook ad accounts and export it to Google Analytics data set. Beautiful and simple.
    • Utilized advanced features of both Facebook API and Google Analytics API.
    Technologies: HTML5, Google Analytics API, Facebook API, WordPress
  • Freelance PHP Developer

    2014 - 2015
    Printing Technic (via Toptal)
    • Implemented a custom HTML5 uploader and integrated it with OpenCart.
    Technologies: Git, jQuery, OpenCart, PHP
  • Web Developer

    2014 - 2014
    All for Body
    • Created a motivational game for people wanting to achieve their personal goals.
    • Developed a platform for communication between professionals and customers.
    Technologies: MySQL, jQuery, Git, Laravel
  • Web Developer

    2012 - 2014
    Online Freelance Agency
    • Created a WordPress plugin used by a large broadcasting company for TV show scheduling.
    • Contributed to a popular WordPress plugin, Stream, which makes it easier to track WordPress activity.
    • Used Git to contribute to work as part of an international team.
    • Prepared a presentation for an international audience about my own plugin concept.
    • Created a flexible WordPress plugin for social sharing.
    • Was invited to meet the team at a trip to Toronto, Canada.
    • Developed XHTMLized's (X-Team's front-end department) website.
    Technologies: Less, MySQL, jQuery, Git, WordPress
  • Web Developer

    2011 - 2012
    • Developed a Magento integration plugin for a large shipping company.
    Technologies: MySQL, jQuery, Magento
  • Web Developer

    2008 - 2011
    • Created a huge platform for people searching for apartments.
    • Developed a popular website containing funny photos and videos.
    Technologies: MySQL, JavaScript, PHP
  • Web Developer

    2009 - 2009
    • Created an automator to prepare a huge database containing car details and parts.
    Technologies: MySQL, PHP
  • Web Developer, Game Reviewer

    2005 - 2008
    Victory Games
    • Created a dedicated CMS for authors.
    • Published game reviews.
    • Helped with design.
    Technologies: MySQL, JavaScript, PHP


  • Telecommunications API for Origin Broadband

    Brand new API for Origin Broadbands. Instead of registering the customers and updating the lines manually, these tasks became automatic with my API. That allowed Origin Broadband not only to save lots of time and money, but also to avoid human mistakes.

  • Facebook Ads Platform and API for Social Sweethearts

    I've been entirely responsible for creating the platform and API for managing Facebook ads for Social Sweethearts. The ads were automatically imported from XML file with an option to edit every single aspect of them. These tools automated tasks that took many hours of work weekly.

  • Expressboard

    Expressboard is a share and collaboration platform for creative souls. The entire code and technical support for this project, as well as some of the graphic design, is my work. Made on Laravel 5.3.

  • CityTV

    A website for a large broadcasting company made with WordPress.

  • Scrabble

    An HTML5 version of Scrabble, my private project, waiting for final release.

  • Fresh Fit

    An administration tool for a catering company made with Laravel.

  • All for Body

    A motivational game for people wanting to achieve their personal goals.

  • Robo Robok

    A Gadu-Gadu (popular Polish communicator) bot, modular and extendable. It helps with things such as Scrabble vocabulary, HTML colors, BMI information, and generating QR codes.

  • Snake

    A simple HTML5 game, both mouse and touchscreen friendly.

  • Stream

    Planes have a black box, WordPress has Stream. When something goes wrong, you need to know how it happened.

    Widely popular WordPress plugin.

  • Joanna Perz

    A beauty salon website made with WordPress.

  • JavaScript Best Practices and Tips by Toptal Developers (Publication)
    This resource contains a collection of JavaScript best practices and JavaScript tips provided by our Toptal network members.


  • Languages

    CSS, HTML5, JavaScript, Sass, SQL, Less, PHP, Python 3, Python, PHP 7
  • Frameworks

    Bootstrap, Lumen, Laravel Spark, Laravel 5, Laravel, Vanilla JS, Swagger, Redux, Tailwind CSS, AngularJS, Kohana
  • Libraries/APIs

    React, Slack API, Facebook Marketing API, Google Analytics API, Laravel Elixir, Facebook SDK, Twitter SDK, Facebook API, Google API, Twitter API, jQuery, Vue.js, Amazon Rekognition
  • Tools

    Gulp.js, Eclipse IDE, Slack, Composer, Postman, Terminal, Vagrant, Bitbucket, Subversion (SVN), Git, SmartGit, JSHint, Sublime Text, GitHub, Bower, Adobe Photoshop, Sublime Text 3
  • Paradigms

    RESTful Development, PHP Standards Recommendations (PSR), Test-driven Development (TDD), Object-oriented Programming (OOP), Responsive Web Design (RWD), Agile Software Development, Model View Controller (MVC), REST
  • Platforms

    MacOS, OctoberCMS, Android, Windows, WordPress, iOS, Magento, OpenCart, Amazon Web Services (AWS)
  • Storage

    Redis, HTML5 Web Storage, MySQL
  • Other

    Full-stack, CORS, WebSockets, Ajax, Single-page Applications (SPA), RESTful APIs, Homebrew, Agile Software Testing, WordPress Plugins, SOAP, AWS, Computer Science, Economics


  • Master's degree in Computer Science and Economics
    2007 - 2012
    Poznan University of Economics - Poznan, Poland

To view more profiles

Join Toptal
Share it with others