Kornel Dubieniecki
Technical Lead at Kornel.me
Prague, Prague, Czechia
Summary
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RockstarKornel Dubieniecki is a Technical Lead based in Prague with 9 years of hands-on experience growing from self-taught junior to lead engineer, specializing in front-end development and product-focused engineering. He has led teams and projects at startups and scaleups (Outreach, STRV, Macromo) while running his own consultancy, Kornel.me, where he coaches mid-level engineers on career growth and practical frameworks. A regular contributor to open-source UI work, Kornel has improved accessibility and state handling in IBM’s widely used Carbon Design System, demonstrating attention to UX and robust component behavior. He blends clear communication and mentorship with pragmatic engineering—helping engineers build portfolios, break plateaus, and leverage AI without burning out. Known for stripping away fluff, he emphasizes measurable learning, fast iteration, and thoughtful career choices.
9 years of coding experience
6 years of employment as a software developer
Stackoverflow
967reputation
48kreached
7answers
5questions
Github Skills (20)
javascript10
carbon-design-system10
system-design10
sys10
react10
sc9
ui-design9
front-end-development9
scs9
uid9
accessibility8
html6
jestjs6
nightmare6
flask-jwt-extended6
Programming languages (5)
Github contributions (5)
carbon-design-system/carbon
Sep 2018 - Feb 2019
A design system built by IBM
Role in this project:
Front-end Developer
Front-end DeveloperContributions:20 commits, 1 issue in 5 months
Contributions summary:Kornel primarily focused on enhancing the Carbon Design System's React components. They implemented new features, such as adding invalid and invalidText props to the ComboBox and adding an ariaLabel prop to DropdownV2. The user also addressed bugs related to DatePicker and Search components, improving the user experience, and ensuring accessibility. Several commits were made to adjust the state handling and overall component styling of various UI elements within the design system.
reactjavascriptdesign-systemibmdesign-systems
lekterable/emoji-to-song
Apr 2018 - May 2020
App developed with React.js and Node.js, using Spotify API
Contributions:8 PRs, 34 pushes in 2 years 1 month
apireactnode-jsexpressspotify
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