Jlkon Jl
Student
Hamburg, Germany
Summary
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RockstarJlkon Jl is a computer science student in Hamburg with a decade of hands-on software experience focused on backend systems and hardware-adjacent programming. He contributes to notable open-source projects like Xournal++, where his C++ and GTK3 work improved UI behavior, image handling, and touch-friendly scrollbar interactions—demonstrating attention to both stability and user experience. Comfortable across full-stack tasks, he bridges low-level problem solving with practical product-facing enhancements. Colleagues know him for steady bug-fix discipline and thoughtful feature tweaks that make complex apps feel smoother and more reliable.
10 years of coding experience
Github Skills (15)
embedded10
debug10
gtk10
c-language10
cross-platform10
u-boot10
cprogramming-language10
sys10
front-end-development10
c119
c179
pdf9
pen8
notepad8
evernote8
Programming languages (13)
Github contributions (5)
xournalpp/xournalpp
Jul 2019 - May 2020
Xournal++ is a handwriting notetaking software with PDF annotation support. Written in C++ with GTK3, supporting Linux (e.g. Ubuntu, Debian, Arch, SUSE), macOS and Windows 10. Supports pen input from devices such as Wacom Tablets.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:135 commits, 22 PRs, 27 pushes in 10 months
Contributions summary:Jlkon primarily contributed to bug fixes and feature enhancements within the Xournal++ project. They addressed issues related to image pasting, search input, zoom functionality, and scrollbar behavior, demonstrating a focus on improving the user interface and overall application stability. The contributions included code modifications in C++ and GTK3, highlighting their involvement in both the user interface and underlying logic of the application. Additionally, they added functionality to disable scrollbar fadeout, indicating an understanding of user experience and potential touch screen interactions.
notespdf-viewerc-plus-plussusewindows-10
lehmanju/homecluster
Dec 2024 - Apr 2025
Contributions:13 PRs, 151 pushes, 1 branch in 3 months
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