Piotr Laszczkowski
Senior Frontend Developer at Tesser
Poland
Summary
🤩
RockstarPiotr Laszczkowski is a Senior Frontend Developer based in Poland with 11 years of experience modernizing web applications and migrating legacy stacks to contemporary frontend architectures. He has deep hands-on expertise in JavaScript UI development, data validation and spreadsheet-like interfaces demonstrated by sustained contributions to the popular Handsontable project and its formula-parser (including adding EXP support). Piotr has moved between roles from developer advocate to front-end architect, blending product-facing communication with implementation and test-driven feature work. Known for focusing on input validation, UX-facing components and reliable integrations, he pairs pragmatic engineering with R&D-led modernization efforts.
11 years of coding experience
11 years of employment as a software developer
Polish, English
Github Skills (21)
formula10
javascript10
data-validation10
datatable10
math10
maths10
math-functions10
parsing10
parse10
formulas10
jtest10
jasmine10
testing9
unit-testing9
user-interface9
Programming languages (3)
Github contributions (5)
handsontable/formula-parser
Jun 2017 - Jun 2018
Javascript Library parsing Excel Formulas and more
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3 releases, 3 reviews, 17 commits in 1 year
Contributions summary:Piotr primarily contributed to the formula parsing functionality within the repository. Their work included adding support for the EXP formula and integrating changes related to this feature. They also updated the supported formulas and made minor code changes. Additionally, the user merged branch releases.
javascript-libraryformulasjavascriptparsingnodejs
handsontable/handsontable
Feb 2016 - Mar 2022
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:138 reviews, 328 commits, 299 PRs in 6 years 1 month
Contributions summary:Piotr's commits primarily focus on implementing and testing features within the `handsontable/handsontable` repository. Their work revolves around the `timeValidator` and other cell-type validators, indicating a focus on data validation and user input handling. The commits include changes to HTML files, alongside modifications to JavaScript files, with the changes pertaining to UI, and user-interfacing elements.
data-editingxlsxreact-gridreact-datatablevue
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.