Sebastian Hajdus
Technical Application Support Analyst
Katowice Metropolitan Area Poland
Summary
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Rockstar🎓
Top SchoolSebastian Hajdus is a technical application support analyst and front-end developer with nine years of experience blending customer-facing support, product-focused engineering, and sales-technical roles across Poland and international markets. He has hands-on expertise in JavaScript and Highcharts, contributing bug fixes, new features and tests to the widely used Highcharts JS project—skills he pairs with Angular support and documentation work. Sebastian moves comfortably between troubleshooting production issues, creating pre-sales technical analyses, and shaping product roadmaps, having also implemented Power BI reporting and Azure DevOps testing workflows. His background spans unconventional domains—from mining engineering to craft-brewery operations—where he applied process management and digital tooling to cut preparation time and build knowledge bases. Comfortable translating technical detail for non-technical stakeholders, he focuses on customer success, usability, accessibility and measurable business impact. Based in the Katowice metropolitan area, he brings a pragmatic, multidisciplinary approach to turning user problems into robust, documented solutions.
9 years of coding experience
11 years of employment as a software developer
Front-End Developer, Front-End Developer at CodersLabTechnician, Mechatronic Science, Technician, Mechatronic Science at Technical SchoolMining Engineer, Mininng Engineering and Geology, Mining Engineer, Mininng Engineering and Geology at AGH University of Krakow
Polish, English, Spanish
Stackoverflow
1,482reputation
28kreached
199answers
0questions
highcharts
top-5%
Github Skills (15)
unit-testing10
typescript10
javascript10
typescripts10
highcharts10
pie-chart10
typescript-types10
sankey-diagram6
css6
vue6
jquery6
r6
angular6
react-highcharts6
react6
Programming languages (4)
Github contributions (5)
highcharts/highcharts
Sep 2020 - Jan 2023
Highcharts JS, the JavaScript charting framework
Role in this project:
Front-end Developer
Front-end DeveloperContributions:11 reviews, 50 commits, 12 PRs in 2 years 5 months
Contributions summary:Sebastian primarily contributed to the Highcharts JavaScript charting framework by fixing bugs related to tooltip positioning and the behavior of the 'thickness' property in pie charts. The user's contributions involved code modifications in TypeScript files, including adjustments to tooltip calculations and the integration of a new 'thickness' option. Furthermore, the user improved unit tests and updated documentation related to the new 'thickness' property.
chartshighchartschartchartingjavascript
hihajdus/hihajdus.github.io
Dec 2016 - Mar 2019
Contributions:14 pushes, 1 branch in 2 years 3 months
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