Jakub Jankiewicz
Founder & Lead Trainer W WikiZEIT
Bliżyn, Świętokrzyskie Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolJakub Jankiewicz is a seasoned JavaScript-focused web developer and open source contributor with 15 years of experience building front-end and full-stack solutions across startups and enterprise clients. He founded WikiZEIT to combine his technical expertise with training on Wikipedia editing and SEO, reflecting a rare mix of developer craft and content/knowledge stewardship. Jakub has shipped robust UI work (notably on the popular jcubic/jquery.terminal project) and improved test coverage and CI reliability for isomorphic-git, showing strengths in both UX polish and engineering quality. His background spans React, TypeScript, Redux, R/Shiny and Node.js, and he has led technical recruitment and architecture efforts for pharma and analytics applications. Pragmatic and curious, he frequently bridges legacy-browser compatibility and modern JS practices—fixing edge-case bugs and browser quirks while keeping developer workflows healthy. Based in Poland, he mentors others and pursues open content and open source as core parts of his professional footprint.
16 years of coding experience
11 years of employment as a software developer
Engineer's degree, Computer Sience, Engineer's degree, Computer Sience at Kielce University of Technology
English, Polish
Stackoverflow
64,308reputation
11.3mreached
1,678answers
781questions
foreach
top-1%
browser
top-5%
git
top-5%
regex
top-5%
indentation
top-5%
async-await
top-5%
Github Skills (49)
localstorage10
git10
javascript10
jquery10
testing10
css10
foreach10
browser10
event-sourcing10
php10
event-emitter10
front-end-development10
html10
eventsource10
eventing10
Programming languages (45)
Github contributions (5)
jcubic/sysend
Jun 2014 - Jan 2023
Web application synchronization between different tabs
Role in this project:
Front-end Developer
Front-end DeveloperContributions:24 releases, 1 review, 168 commits in 8 years 8 months
Contributions summary:Jakub primarily contributed to the development of a web application for tab synchronization. Their work involved modifying the core JavaScript file, `sysend.js`, to improve functionality by removing licensing information, cleaning up local storage, handling undefined messages, and implementing a demo file. Key changes include refactoring the codebase to fix issues related to cross-tab communication and improving overall performance. Additionally, they addressed specific browser compatibility issues, particularly in Internet Explorer and Edge.
eventsbrowserproxysynchronizationjavascript
jcubic/jquery.terminal
Feb 2011 - Jan 2023
jQuery Terminal Emulator - JavaScript library for creating web-based terminals with custom commands
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:159 releases, 4 reviews, 3177 commits in 12 years
Contributions summary:Jakub appears to be a full-stack developer contributing to a jQuery-based terminal emulator project. Their commits focused on bug fixes related to UI issues like the selection style and improved the visual consistency. They were also involved in feature implementations, particularly focusing on the use of JavaScript within the core functionality of the project. Additionally, the user demonstrated skills in enhancing the user experience.
javascriptjquery-terminaljson-rpcinterpretershell
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