Cezary Tomczyk, Web App Developer in Prague, Czech Republic
Cezary Tomczyk

Web App Developer in Prague, Czech Republic

Member since December 7, 2015
Cezary has over ten years of experience in web technologies, and he is passionate about managing projects and people. Cezary has worked the complete product lifecycle from beginning to the end as and is experienced in hand-coding, using the Semantic Web, writing usable code that is cross-browser compliant, and adheres to web content accessibility guidelines from W3C. Cezary specializes in search engine and performance optimization solutions.
Cezary is now available for hire


  • eSSENTIAL Accessibility
    Website QA, QA Testing, Architecture, APIs, Objectives & Key Results (OKRs)...
  • Infor
    Scrum Master, Team Mentoring, Mentorship, Agile Software Development...
  • Apple
    WCAG 2, HTML5, CSS3, JavaScript, Web Accessibility...



Prague, Czech Republic



Preferred Environment

MacOS, Git, Visual Studio, Web Accessibility

The most amazing...

...project that I've worked on was when I co-authored and deployed the client-side, cross-browser library for Skype for the internet.


  • Chief Technology Officer

    2019 - 2020
    eSSENTIAL Accessibility
    • Interviewed, developed, managed, mentored, and motivated software engineering teams, including QA.
    • Tracked and organized tasks in Jira following the Scrum methodology.
    • Developed and rolled out a scalable, fast, and cross-browser/devices eA platform to manage an automated and manual digital accessibility testing process, including a crawler, analytics, and reports.
    • Created and measured product and team goals (OKRs).
    • Acted as a strong team leader with strategic thinking to execute from, who knows every corner of IT, even hands-on coding.
    • Architected and implemented the development cycle, including Scrum methodology, code review, automated quality steps, CI/CD, deployment, change management, monitoring performance, and executing automated E2E and unit tests.
    • Authored ASLint, an automated accessibility testing tool that is being used in the eA platform.
    • Created/reviewed accessibility rules, processes, and testing strategy as a member of the eA accessibility committee.
    Technologies: Website QA, QA Testing, Architecture, APIs, Objectives & Key Results (OKRs), Sass, Scaling, People Management, Management, TypeScript, Accessibility, Web Accessibility, Accessible Rich Internet Applications (ARIA)
  • Senior Software Engineer

    2017 - 2019
    • Created a software development build process, including quality and testing.
    • Mentored team members and achieved 100% higher quality and development velocity.
    • Organized a scrum process successfully and passed the knowledge to others.
    Technologies: Scrum Master, Team Mentoring, Mentorship, Agile Software Development, Architecture, Website Performance, Angular, Sass, CSS, HTML5, JavaScript, TypeScript, Accessibility, Web Accessibility, Accessible Rich Internet Applications (ARIA)
  • Accessibility Engineer

    2015 - 2016
    • Responsible for checking quality, giving advice in the accessibility area, and driving accessibility implementations.
    Technologies: WCAG 2, HTML5, CSS3, JavaScript, Web Accessibility, Accessible Rich Internet Applications (ARIA)
  • Software Developer 4 (Principal Engineer)

    2015 - 2015
    • Contributed to a project related to the Oracle Applications and Services Cloud that allows users to build the application from independent components and hook REST services.
    • Implemented accessibility standards based on WCAG 2.0 specification.
    • Created a quality, gated check-in validation process. Checked for circular dependencies, linting client-side scripts (JavaScript, Node.js) using the eslint.org tool, and also utilized Sass, HTML, and JSON files.
    • Worked on telemetry to measure the application performance.
    • Aided with the planning, organizing, and monitoring workflow.
    Technologies: Model View Viewmodel (MVVM), ASP.NET Core MVC, Git, jQuery, Maven, Java, CSS3, HTML5, Sass, JavaScript, Web Accessibility, Accessible Rich Internet Applications (ARIA)
  • Software Developer 2

    2012 - 2015
    Microsoft, Skype Division
    • Co-authored the client-side, cross-browser library that provides video, audio, chat, and notifications.
    • Authored the i18n and g11n library; implemented the i18n framework and the right-to-left solutions.
    • Co-led the the team that made Skype for Web more accessible.
    • Created the writing tools for the A/B testing.
    • As a scrum master, managed the process about how the information was exchanged; via various tech session in order to pool shared knowledge.
    • Worked on the build process: the validation and the deployment using Ant and Grunt.
    • Contributed to the construction of the API that connects Office 365 to Skype.
    • Invented a solution that received a patent in the United States.
    Technologies: S#arp Architecture, Grunt, Apache Ant, Node.js, C#, CSS3, HTML5, Sass, JavaScript
  • Software Developer

    2011 - 2011
    • Constructed a dashboard with all the analytics based on data from Nokia Maps.
    • Implemented a responsive design for the dashboard.
    • Authored an extension for Google Chrome that enables one to manage Nokia Maps favorites through the browser directly.
    • Optimized the sorting and presentation of a large amount of data on the dashboard.
    • Created all of the charts using Scalable Vector Graphics (SVG).
    • Developed a library to communicate with Nokia Maps REST services.
    Technologies: Elycharts, jQuery, CSS3, HTML5, JavaScript
  • CEO

    2003 - 2011
    • Regulated the finances (budgeting, controlling finance flow, working with accountants), negotiations, and led the web development.
    • Aided in the development of a web-based help desk and CRM applications like tickets, maintaining the FAQ, records, the mailing, Information Technology Infrastructure Library rules, and service/lease agreements. Utilized (X)HTML, CSS, JavaScript, PHP, MySQL, SVN, Git, and XMLHttpRequest.
    • Created a JavaScript framework to manipulate the DOM, events, processing templates, and accessing the data from server.
    • Developed Google Chrome extensions and an application to manage tourist reservations and offers.
    • Performed server administration on the Ubuntu Server; caching the network using Varnish, Apache, MySQL, PostgreSQL, and managing network traffic (balance usage).
    Technologies: PHP, CSS3, HTML5, JavaScript
  • CEO / Founder

    1998 - 2003
    Freelance Work
    • Worked on financial documentation and with accountants.
    • Built and maintained strong customer relations for the company; also provided customer support.
    • Provided IT services for small and large companies using ITIL practices; dealt with networks and servers mostly.
    • Created web pages using JavaScript, HTML, and CSS.
    Technologies: JavaScript, CSS, HTML, Linux Servers, Windows Server
  • Salesman

    1997 - 1998
    ATS - Systemy Informatyczne Sp. z o.o.
    • Responsible for maintaining customer relations with major customers, generating offers, networking, and aiding in contract negotiations.
    Technologies: Customer Service


  • ASLint | Accessibility Testing Tool

    An accessibility testing tool that helps to scan and find accessibility issues on your website content. It covers WCAG 2.1 and best practices. It works from the bookmarklet as well as in CI/CD and works across different browsers. It is fast and reliable.

  • Company Website

    This project was about implementing a WordPress-based website that doesn't have accessibility issues, has high loading performance, and is available on multiple devices. I achieved the goal of zero errors on all website pages and applied a robust quality and deployment process.

  • Web Accessibility: Why W3C Standards Are Often Ignored (Publication)
    The goal of this article is to introduce you to the underlying principles of accessibility and help you flawlessly implement web accessibility guidelines and standards on your next project. Even minor improvements can help your content rank better, reach more people, and improve the overall user experience.


  • Languages

    HTML, CSS, TypeScript, HTML5, ECMAScript (ES6), CSS3, JavaScript, Sass, Java, PHP, C#
  • Frameworks

    Angular, Jasmine, Knockout (Knockout.js), JavaScript MVC, ASP.NET Core MVC, S#arp Architecture, Yii 2, Ember.js
  • Tools

    Grunt, NPM, Adobe Photoshop, Subversion (SVN), Jira, Bower, Git, IntelliJ IDEA, Mocha, Visual Studio, Maven, Apache Ant, Jenkins, VirtualBox, Inkscape, GitHub
  • Paradigms

    Agile Software Development, Continuous Integration (CI), Object-oriented Programming (OOP), Model View Viewmodel (MVVM), Unit Testing, Model View Controller (MVC), Scrum, Test-driven Development (TDD), Behavior-driven Development (BDD), Design Patterns, Continuous Deployment, REST, Functional Programming, Responsive Web Design (RWD), Prototype-based OOP, Management, Objectives & Key Results (OKRs)
  • Platforms

    Windows, MacOS, WordPress, Ubuntu Linux, Windows Server
  • Other

    Website Performance, Mentorship, People Management, Web App Development, WCAG 2, Accessibility, SEO Audits, CTO, Web Accessibility, Accessible Rich Internet Applications (ARIA), Architecture, QA Testing, Linux Servers, Customer Service, Elycharts, Team Mentoring, Scrum Master, Scaling, APIs, Website QA
  • Libraries/APIs

    Node.js, jQuery, RequireJS, JavaScript API for Chrome, WebRTC, React
  • Storage

    MongoDB, MySQL, PostgreSQL


  • Bachelor of Science in Computer Systems
    1997 - 2001
    Technical University of Computer Science and Information Systems - Szczecin, Poland
  • Partially Completed Bachelor's Degree in Material Engineering
    1995 - 1997
    Technical University of Mechanical Engineering - Szczecin, Poland
  • High School Diploma in Mechanical Repair of Rolling Stock (Rail Way Vehicles)
    1990 - 1995
    Rails Technical Secondary Schoool - Szczecin, Poland

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