Markus Kreusch
Senior Innovation Developer
Falkensee, Brandenburg, Germany
Summary
🤩
Rockstar🎓
Top SchoolMarkus Kreusch is a Senior Innovation Developer based in Falkensee, Germany, with 12 years of experience building secure, maintainable backend systems and leading development teams. He has progressed from hands-on application development to team leadership and innovation roles at Bundesdruckerei-Gruppe, bringing practical expertise in security-focused engineering and platform design. Markus contributes to notable open-source projects like OrientDB—where he implemented AES/GCM encryption and strengthened key handling—and Cryptomator, refactoring cross-platform WebDAV mounting for greater modularity. His background blends consultancy, startup leadership, and freelance open-source work, reflecting an ability to translate complex cryptographic and cross-platform problems into robust production solutions. Colleagues describe him as a pragmatic engineer who favors clean abstractions and improves legacy codebases for long-term maintainability.
12 years of coding experience
4 years of employment as a software developer
FernUniversität in HagenIT Specialist, IT Specialist at Berufskolleg des Rhein-Sieg-Kreises in HennefBachelor of Science - BS, Bachelor of Science - BS at FOM Hochschule für Oekonomie & Management
German, English, French, Japanese
Stackoverflow
2,091reputation
227kreached
25answers
13questions
annotations
top-5%
spring-mvc
top-5%
spring
top-5%
Github Skills (30)
admin10
orientdb10
databases10
database-administration10
java10
security10
javas10
webdav10
encryption10
database10
annotations9
testing9
filesystem9
spring9
file-operations9
Programming languages (9)
Github contributions (5)
cryptomator/cryptomator
Mar 2014 - May 2018
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:98 commits, 67 pushes, 14 branches in 4 years 2 months
Contributions summary:Markus refactored the `WebDavMounter`, implementing a strategy pattern to handle mounting WebDAV shares across different operating systems. Their contributions included modifying Java code, specifically in classes related to WebDAV mounting and the integration with Windows, macOS, and Linux systems. This refactoring improved the flexibility and maintainability of the code by introducing a strategy-based approach to handle platform-specific mounting operations.
cryptographytransparentprivacyclient-sidesecurity
orientechnologies/orientdb
Apr 2018 - May 2018
OrientDB is the most versatile DBMS supporting Graph, Document, Reactive, Full-Text and Geospatial models in one Multi-Model product. OrientDB can run distributed (Multi-Master), supports SQL, ACID Transactions, Full-Text indexing and Reactive Queries.
Role in this project:Back-end Developer
Back-end DeveloperContributions:10 commits, 1 PR, 2 comments in 1 month
Contributions summary:Markus focused on enhancing the encryption capabilities of the OrientDB database. They implemented AES/GCM encryption, including key validation and secure random number generation. Key contributions involve adding and testing OAESGCM encryption and refactoring existing code for improved error handling, indicating a focus on security and low-level database operations. They also updated the test setup and configurations.
dbmsrdbmsindexingrelational-databasesreactive
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