Jonas Kamsker
.NET Developer & Open Source Enthusiast
About
Full-stack developer with a strong focus on backend, experienced in C#/.NET and various frontend technologies. Passionate about software architecture, clean code, open source, and generative AI. Creator of Audible Tools, a privacy-focused browser-based AAX converter with 500+ GitHub stars. Active open-source contributor to projects like spectre.console, graphql-dotnet, NSwag, and FFMpegCore. Volunteer mentor at CoderDojo Linz, teaching kids programming, Docker, and Discord bot development.
Skills
C# .NET Expert
Web
Databases
Tools
Other Languages
Projects
Audible Tools
Privacy-focused browser-based AAX to M4B/MP3/FLAC converter with 500+ GitHub stars. Processes audiobooks locally without uploading data.
View Project
JKToolKit.Spectre.AutoCompletion
Supercharge your Spectre.Console apps with AutoCompletion support
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LiteDB.Migration
Migration framework for LiteDB databases
View Project
FourSer.Gen
High-performance binary serializer source generator for .NET
View ProjectWork Experience
Senior Software Developer
dccx GmbHOct 2025 - Present (Part-time)
Software Developer
Suxxesso GmbHMay 2024 - Sept 2025, Vienna/Remote. Architecture and implementation of a central Command & Control server for managing and executing test cases. Development of test execution agents and maintainable architectures.
Software Developer
APRO Kassensysteme GmbH2019 - April 2024, Linz. Comprehensive cash register solutions for gastronomy. Web API development with ASP.NET Core. Frontend development with ReactJS.
https://apro.at/Junior Software Developer C#.NET
BEKO Engineering & InformatikMar 2018 - Dec 2018, Graz. First professional experience with customer projects and internal administration software.
https://beko.at/Education
2012 - 2018