Alexander Schellenberg
Software Developer at Finanz Informatik
Wesel, North Rhine-Westphalia, Germany
Summary
👤
Senior🎓
Top SchoolAlexander Schellenberg is a pragmatic software developer with 11 years of hands-on experience building and modernizing backend systems, currently contributing to the OSPlus BI project at Finanz Informatik. He has deep Spring Boot and Java expertise, having developed microservices, APIs, and testing infrastructures across multiple HR and management systems and driven migrations from JUnit 4 to JUnit 5. Comfortable with database-backed services, GraphQL, Spring Security, CI/CD pipelines and API documentation, he combines feature development with refactoring and test automation to improve long-term maintainability. His consulting work shows a pattern of taking ownership for end-to-end deliveries—from requirements to integration tests—while mentoring through code quality improvements. Based in Wesel, Germany, he brings a practical cross-domain background informed by studies in applied computer science and nanotechnology, which underpins a detail-oriented, systems-thinking approach. Though not highly public on GitHub, his steady professional contributions reflect reliability and sustained delivery in enterprise projects.
11 years of coding experience
2 years of employment as a software developer
None, Applied Computer Science - System Engineering, None, Applied Computer Science - System Engineering at Universität Duisburg-Essen, Standort EssenAbitur, Abitur at Andreas-Vesalius-Gymnasium WeselNone, Nanotechnology, None, Nanotechnology at University of Duisburg-Essen
English, Russian, German
Github Skills (93)
testing10
code-coverage10
api-testing9
database9
high-performance9
world-of-warcraft9
cypress9
algorithms9
component-testing9
data-structures9
algorithm9
java9
edgedb9
auction8
dotnet8
Programming languages (14)
Github contributions (5)
oppahansi/javalings
May 2023 - Dec 2025
:coffee: Small exercises to get you used to reading and writing Java code! Inspired by rustlings.
Contributions:1 review, 6 PRs, 30 pushes in 2 years 7 months
javainteractivejavalings
oppahansi/mangos-classic
Jun 2017 - Apr 2019
Contributions:139 pushes, 8 branches in 1 year 10 months
mangoswow-emulationemulation
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