Sebastian Stenzel
CTO at Skymatic GmbH
Rhein-Neckar Metropolitan Region Germany
Summary
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Rockstar🎓
Top SchoolSebastian Stenzel is a hands-on CTO with 11 years of engineering and leadership experience, currently steering technical product development, architecture, and security decisions for Skymatic in the Rhein-Neckar region. He blends systems-level expertise with practical engineering, having contributed to core Java (OpenJDK) file-system and native buffer handling as well as secure client-side encryption tooling in Cryptomator. His background ranges from backend system integration and SPA development for large German web portals to building company-internal IT infrastructure and customer-facing security features. Known for tackling low-level interoperability and data-integrity issues, he often operates at the intersection of native code and high-level Java platforms.
11 years of coding experience
4 years of employment as a software developer
Master’s Degree, Master’s Degree at Bonn-Rhein-Sieg University of Applied SciencesBachelor’s Degree, Bachelor’s Degree at FOM University of Applied Sciences for Economics and Management
Stackoverflow
4,540reputation
722kreached
71answers
33questions
java
top-5%
Github Skills (17)
filesystem10
java10
openjdk10
javas10
api-design9
bytebuffer9
webservice8
gnupg6
maven6
wildfly6
github6
remote-debugging6
debugging6
javafx6
maven-deploy-plugin6
Programming languages (19)
Github contributions (5)
cryptomator/cryptomator
Dec 2014 - Dec 2022
Cryptomator for Windows, macOS, and Linux: Secure client-side encryption for your cloud storage, ensuring privacy and control over your data.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:29 releases, 508 reviews, 2202 commits in 8 years 1 month
Contributions summary:Sebastian's contributions primarily focused on modifying existing code to reference documentation, and migrating to the new API calls of a keyloading strategy. They updated a resource file. Additionally, the user added the option to select a device and a button for requesting device registration.
cryptographytransparentprivacyclient-sidesecurity
openjdk/jdk
Apr 2019 - Jul 2023
JDK main-line development https://openjdk.org/projects/jdk
Role in this project:Back-end Developer
Back-end DeveloperContributions:13 reviews, 11 PRs, 42 comments in 4 years 3 months
Contributions summary:Sebastian primarily focused on enhancing the Java-based JDK, specifically addressing file system and extended attribute functionalities. Their contributions involve supporting user-defined file attributes on different operating systems, including macOS (BSD) and AIX. The user also addressed bug fixes and refactoring related to native buffer handling during read/write operations for these attributes, ensuring data integrity and preventing potential memory leaks. These changes involved modifications to core Java base libraries and native code interactions.
openjdkjavajvmjdk
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