Jan Siegel
Senior JavaScript Developer at Handsontable
Gdańsk, Pomeranian Voivodeship, Poland
Summary
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Rockstar🎓
Top SchoolJan Siegel is a Senior JavaScript Developer based in Gdańsk with 12 years of experience building and refining complex front-end components and developer tooling. At Handsontable since 2014 he has driven UI-focused features and bug fixes for a widely used open-source spreadsheet-like data grid, contributed Vue and TypeScript integrations, and maintained API docs—blending hands-on engineering with technical writing. His work spans full-stack responsibilities including build and release config for HyperFormula, demonstrating comfort across frontend, backend build processes, and release automation. Known for pragmatic refactors (multi-level header rendering, cell interaction fixes) and attention to UX details like cursor and autocomplete behavior, he balances polish with reliability.
12 years of coding experience
1 year of employment as a software developer
Masters degree, Informatyka, Masters degree, Informatyka at Uniwersytet Gdański
Polish, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (24)
javascript10
component-development10
css10
configuration-management10
typescript10
user-interface10
release-management10
front-end-development10
vue10
build-automation10
typescript-types10
html10
typescripts10
vue-jsx10
documentation10
Programming languages (3)
Github contributions (5)
handsontable/handsontable
Jun 2014 - Jan 2023
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:
Full-stack Developer
Full-stack DeveloperContributions:114 releases, 885 reviews, 1684 commits in 8 years 9 months
Contributions summary:Jan primarily contributed to the Handsontable project by implementing features related to the table's user interface, including the addition of a dropdown renderer and validator for the select cell type. They also refactored various functionalities, such as the rendering of multi-level headers and the implementation of a "grab" cursor for column/row resizing. Furthermore, they addressed multiple bugs, ensuring the correct display of data and behavior, especially concerning cell selection and interaction with the browser's autocomplete functionality.
data-editingxlsxreact-gridreact-datatablevue
handsontable/vue-handsontable-official
Feb 2017 - Mar 2021
Vue Data Grid with Spreadsheet Look & Feel. Official Vue wrapper for Handsontable.
Role in this project:Front-end Developer
Front-end DeveloperContributions:13 releases, 1 review, 99 commits in 4 years 1 month
Contributions summary:Jan primarily contributed to the development of a Vue.js-based data grid component, which is a wrapper for the Handsontable library. The commits focus on adding fundamental functionality, fixing various issues, integrating documentation, and adding demo examples. The user made structural adjustments to the component, migrating it to TypeScript.
data-gridlookhandsontablevue-wrappervue
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