Stefan Viol
Manager, Engineering at QuillBot
Groß Kreutz (Havel), Brandenburg, Germany
Summary
🤩
Rockstar🎓
Top SchoolStefan Viol is an engineering manager and DevOps leader with nine years of experience building and operating production-grade back-end systems from Germany. Currently overseeing engineering at QuillBot and heading DevOps at LanguageTool, he blends hands-on Java server development with infrastructure and build-process improvements. His open-source contributions to the widely used LanguageTool project include IP logging, regex refinements, licensing and build refactors—work that improved robustness and maintainability across a multilingual grammar-checking codebase. Stefan’s background spans team leadership and systems engineering at ARKTIS, giving him a practical mix of people management and deep operational fluency. He holds a BASc in Wirtschaftsinformatik and is known for tackling messy, behind-the-scenes problems that make large-scale developer tooling and services reliable.
9 years of coding experience
6 years of employment as a software developer
Bachelor of Applied Science - BASc Wirtschaftsinformatik, Bachelor of Applied Science - BASc Wirtschaftsinformatik at Brandenburg University of Applied Sciences
German, English
Github Skills (9)
javas10
java10
apidoc9
back-end-development9
api9
regular-expression8
build-automation8
devops8
configuration-management7
Programming languages (7)
Github contributions (5)
languagetool-org/languagetool
Oct 2021 - Jan 2023
Style and Grammar Checker for 25+ Languages
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:101 reviews, 217 commits, 160 PRs in 1 year 3 months
Contributions summary:Stefan primarily contributed to the back-end functionality of the LanguageTool project by adding IP logging features to the server-side API, including modifications to the Java code base for handling request information. They also made code changes related to build configuration. The user added a license, improved regular expressions, and refactored code related to the core logic of the project, improving the project's functionality and maintainability. The commits show a focus on infrastructure and build process improvements for the project.
style-checkergrammar-checkercheckergrammarlanguagetool
SteVio89/languagetool
Oct 2021 - Feb 2025
Style and Grammar Checker for 25+ Languages
Contributions:278 pushes, 74 branches in 3 years 5 months
grammar-checkercheckergrammarlanguagetoolabstract-syntax-tree
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