Andreas Berger
Germany
Summary
🤩
RockstarAndreas Berger is a seasoned full stack Java developer and software architect with over a decade of freelance experience building and optimizing backend systems. Based in Germany, he combines hands-on engineering with architectural thinking, contributing to notable open-source projects like Backstage (improving GitLab integration) and neo4j/graphql (refactoring query execution and performance-sensitive logic). He has a knack for pragmatic refactors and test-driven improvements, and has applied that attention to detail in domains from developer portals to home automation bindings for openHAB. Comfortable across the stack, Andreas focuses on clean configuration, reliable integrations, and measurable performance gains—often surfacing subtle fixes that improve real-world interoperability.
13 years of coding experience
Stackoverflow
853reputation
131kreached
10answers
0questions
spring
top-5%
Github Skills (38)
scaffold10
addin10
gitlab-api10
back-end-development10
typescript10
openhab10
wpgraphql10
java10
neo4j10
javas10
backstage10
cypher10
sys10
wordpress-graphql10
typescript-types10
Programming languages (14)
Github contributions (5)
openhab/openhab-addons
May 2022 - Dec 2022
Add-ons for openHAB
Role in this project:
Back-end Developer
Back-end DeveloperContributions:17 reviews, 9 commits, 12 PRs in 7 months
Contributions summary:Andreas's primary contribution revolves around developing and maintaining the `fineoffsetweatherstation` binding. They implemented new features, including supporting the ELV protocol and adding a channel for sensor battery voltage. Additionally, the user fixed bugs related to pressure conversion and temperature readings, ensuring the accurate representation of data from the weather station. The work also involved adding support for the new GW2001 weather station and fixing the rain rate readings.
openhabjavaadd-ons
backstage/backstage
Feb 2023 - Dec 2025
Backstage is an open framework for building developer portals
Role in this project:Back-end Developer
Back-end DeveloperContributions:21 reviews, 20 PRs, 100 comments in 2 years 10 months
Contributions summary:Andreas primarily focused on enhancing the Gitlab integration within the Backstage developer portal framework. Their contributions included deprecating and refactoring configuration keys within the GitLab discovery provider, adding logging for deprecated configurations, and improving the Gitlab URL reader to load only requested sub-paths. Furthermore, the user added a new scaffolder action to ensure a Gitlab group exists. These changes centered around improving the integration with Gitlab and providing better functionality to Backstage users.
backstageinfrastructuredxdeveloper-experiencedeveloper-portal
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