Stefan Kalscheuer
FullStack Software Developer at Freiberuflich
Aachen, North Rhine-Westphalia, Germany
Summary
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RockstarStefan Kalscheuer is a FullStack Software Developer based in Aachen, Germany, with 11 years of experience delivering pragmatic backend and embedded solutions as a freelancer. He blends web and systems expertise—working on DNS tooling like zdns as well as low-level firmware and OpenWrt kernel/device-tree patches for diverse hardware platforms. Stefan’s contributions show a knack for practical interoperability: adding DNS class/config options and IPv4-mapped IPv6 handling on one hand, and adapting Marlin firmware and kernel modules for real-world devices on the other. Comfortable across the stack, he focuses on maintainable code, dependency hygiene, and adapting upstream projects to specific hardware needs.
10 years of coding experience
Github Skills (29)
patch10
firmware10
kernel-module10
linux-kernel10
networking10
kernel10
openwrt10
device-tree10
go10
u-boot10
device-driver10
dns10
sys10
kernel-mode10
embedded10
Programming languages (10)
Github contributions (5)
knutwurst/Marlin-2-0-x-Anycubic-i3-MEGA-S
Oct 2021 - Dec 2022
Marlin 2.0.x Version for Anycubic i3 MEGA M/S/P/X/CHIRON and 4MAX with Anycubic TFT or the "new" DGUS Clone TFT - Now also with BLTouch!
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:24 commits, 27 PRs, 112 comments in 1 year 2 months
Contributions summary:Stefan primarily contributed to updating and maintaining the Marlin firmware for 3D printers, specifically targeting Anycubic i3 Mega and Chiron models. Their work involved updating the codebase to newer Marlin versions, including adapting configurations for specific Anycubic touchscreen implementations. Furthermore, the user added support for features like laser engraving and host action commands, demonstrating a focus on customization and enhancing the firmware's functionality for the target hardware.
4max-promarlin-firmwaremarlinmarlinfwauto-bed-leveling
zmap/zdns
May 2017 - Aug 2022
Fast DNS Lookup Library and CLI Tool
Role in this project:Back-end Developer
Back-end DeveloperContributions:13 commits, 14 PRs, 25 comments in 5 years 4 months
Contributions summary:Stefan primarily contributed to the `zdns` library, focusing on enhancing its DNS lookup capabilities. Their work included adding features to configure DNS classes, updating test cases, and handling various record types such as NAPTR and DNAME. The user also improved the handling of IPv4-mapped IPv6 addresses and refined the codebase by updating and pruning dependencies.
dns-lookupcorednsdnscliscanner
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