Wojciech Czerniak
Full-stack Developer & Founder at Flatcal
Gdańsk, Pomeranian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolWojciech Czerniak is a seasoned full‑stack developer and founder with 12+ years of experience building complex web products, from architecture and design systems to back-end queues and deployment. He has led engineering teams and open-source projects—most notably Handsontable and HyperFormula—contributing performance optimizations, documentation, and build tooling fixes to a widely used JavaScript data-grid and headless spreadsheet. At Dynatrace he combined principal engineering with people leadership, shaping micro‑front‑end platforms and SDK generators while mentoring teams and improving developer workflows. He repeatedly ships end‑to‑end products—whether a browser 3D printing pipeline or a self‑hosted scalable calendar app—and blends hands‑on coding (JS, React, Node, PHP, Docker) with product and content strategy. Based in Gdańsk, he balances deep technical craft with recruitment, team growth and an appetite for surprising side projects—hence his GitHub bio: "Zombie Hunter and JavaScript dev when there are no zombies around."
12 years of coding experience
11 years of employment as a software developer
Master of Science Engineer Automatic Control and Robotics with specialization in Robotics and Mechatronics Systems, Master of Science Engineer Automatic Control and Robotics with specialization in Robotics and Mechatronics Systems at Gdańsk University of Technology
English, Polish
Stackoverflow
1,278reputation
39kreached
40answers
0questions
Github Skills (22)
formula10
javascript10
typescript10
excel10
formulas10
typescript-types10
datagrid10
typescripts10
documentation10
build-automation9
performance-optimization9
vuepress9
cicd8
testing8
typecript7
Programming languages (9)
Github contributions (5)
handsontable/hyperformula
Dec 2019 - Oct 2021
HyperFormula is an open-source headless spreadsheet for business web apps. It comes with over 400 formulas, CRUD operations, undo-redo, clipboard support, and sorting.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:386 reviews, 77 commits, 57 PRs in 1 year 10 months
Contributions summary:Wojciech made significant contributions to the HyperFormula project, focusing on both backend and frontend aspects. They fixed a crucial bundle-check script issue by adjusting the constructor usage, revealing their familiarity with the build process. Moreover, the user implemented improvements in code organization and documentation by hiding private properties, refactoring factory functions, and adding TSDoc tags. They also worked on adding Vuepress as additional API reference server.
reactformulasjavascriptperformancecrud
handsontable/handsontable
Jun 2018 - Dec 2021
JavaScript Data Grid / Data Table with a Spreadsheet Look & Feel. Works with React, Angular, and Vue. Supported by the Handsontable team ⚡
Role in this project:Front-end Developer
Front-end DeveloperContributions:358 reviews, 33 commits, 34 PRs in 3 years 6 months
Contributions summary:Wojciech primarily contributed to the documentation of the Handsontable library, focusing on options and configuration settings. They updated the documentation for PRO plugins and fixed typos. Additionally, the user optimized the getRenderableIndexes and cacheFromPhysicalToVisualIndexes functions for performance improvements. These contributions suggest a focus on improving the user experience and performance of the data grid component.
data-editingxlsxreact-gridreact-datatablevue
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