Yurii Piskun
Speed Optimization & Core Web Vitals Expert, Senior Frontend Developer
Kyiv, Ukraine
Summary
👤
Senior🎓
Top SchoolYurii Piskun is a senior frontend developer and Core Web Vitals expert from Kyiv with 11 years of experience obsessively optimizing client-side performance—every second and kilobyte matter. He has led frontend architecture and teams for large enterprises like Oriflame and NZZ, modernizing legacy stacks into TypeScript/React ecosystems while delivering measurable speed and UX improvements. As a WordPress speed specialist on Upwork he performs deep audits with Lighthouse, WebPageTest and PageSpeed and tunes themes, plugins and custom code to hit strict LCP/FCP/CLS targets. Yurii is also an active open-source contributor, enhancing UI/UX and integrations for projects like Logseq and Promnesia that bridge personal knowledge tools (Obsidian/Logseq) with full-stack engineering. Known for pragmatic refactors and performance-first CSS/JS, he blends hands-on coding with frontend DevOps and mentoring to ship resilient, fast web experiences.
11 years of coding experience
9 years of employment as a software developer
Kherson State Technical University Physicotechnical liceumIgor Sikorsky Kyiv Polytechnic Institute
Ukrainian, English
Github Skills (16)
css10
opera-extension10
javascript10
webextension10
chrome-extension10
react10
clojurescript10
browser-extension10
python9
ui-design9
notepad8
front-end-development8
markdown7
knowledge-management7
knowledge-graph7
Programming languages (12)
Github contributions (5)
karlicoss/promnesia
Apr 2022 - May 2022
Another piece of your extended mind
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:50 reviews, 6 commits, 13 PRs in 7 days
Contributions summary:Yurii primarily focused on enhancing the functionality and user experience of the Promnesia project. They added features to index and integrate with Logseq and Obsidian, demonstrating a clear understanding of personal knowledge management systems. Contributions include implementing URI schemes, correcting file splitting logic, adding documentation, and enhancing the user interface with new CSS classes and styling, showcasing a blend of backend and frontend development skills. They also made changes to the extension code to improve sidebar features.
piecememorypkmbrowser-historyextended
logseq/logseq
Jul 2022 - Nov 2022
A privacy-first, open-source platform for knowledge management and collaboration. Download link: http://github.com/logseq/logseq/releases. roadmap: http://trello.com/b/8txSM12G/roadmap
Role in this project:Front-end Developer
Front-end DeveloperContributions:3 reviews, 6 commits, 13 PRs in 3 months
Contributions summary:Yurii contributed primarily to the front-end of the Logseq application, focusing on UI/UX improvements within the plugin settings interface. Their work included adding new heading and data-key features to enhance the settings presentation and functionality. They also refactored the page components, addressing the display of properties and references. Additionally, the user modified the CSS to include the missed mark variables and hide empty settings descriptions.
knowledge-basecollaborationknowledge-graphlinkmarkdown
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