Klaus Zanders
Senior Software Engineer at OpenProject | open source project management software
Frankfurt, Hesse, Germany
Summary
🤩
Rockstar🎓
Top SchoolKlaus Zanders is a Senior Software Engineer based in Frankfurt with 14 years of experience building scalable back-end systems and consumer-facing products across startups and enterprise environments. He has delivered production-grade solutions in transportation (demand-responsive transit), fintech and insurance, and contributed to Shopify’s Collabs product and the leading open-source project management tool OpenProject. Equally comfortable in Ruby/Rails back-ends and native iOS work, he has a track record of refactoring legacy systems, implementing robust migrations and permission models, and modernizing mobile code to native JSON handling. Klaus blends hands-on engineering with product-minded collaboration—having worked directly with product owners on tenders and payment integrations—and frequently contributes to open source, notably enhancing role/permission semantics in OpenProject.
13 years of coding experience
13 years of employment as a software developer
Bachelor of Science - BS Angewandte Informatik, Bachelor of Science - BS Angewandte Informatik at Baden-Wuerttemberg Cooperative State University (DHBW)
German, English
Stackoverflow
6,832reputation
508kreached
104answers
2questions
typescript
top-5%
switch-statement
top-1%
hash
top-5%
git
top-5%
javascript
top-5%
Github Skills (29)
database-migrations10
objective-c10
ios10
mobile-development10
switch-statement10
permission10
app-dev10
ruby10
mobile-application10
activerecord10
database-migration10
access-management10
rights-management10
json-serialization10
sha9
Programming languages (15)
Github contributions (5)
opf/openproject
May 2023 - Apr 2025
OpenProject is the leading open source project management software.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:428 reviews, 453 PRs, 1302 pushes in 1 year 10 months
Contributions summary:Klaus's commits primarily revolve around enhancing the OpenProject project management software's Project Roles, focusing on database migrations and service modifications. They added and ensured the correct implementation of public permissions for Project Roles. Furthermore, the user refactored the codebase related to role permissions. This includes changes to the set_attributes_service spec and the corresponding ruby services.
taigascrumbcfproject-planningruby
dennisreimann/ioctocat
Oct 2012 - Jan 2013
iOctocat v1 - GitHub for iOS (works on the iPhone, iPad, and iPod Touch)
Role in this project:Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:10 commits in 2 months
Contributions summary:Klaus's commits primarily focus on updating the iOS application iOctocat. Their main contribution involves refactoring the codebase to utilize native iOS JSON serialization instead of the third-party CJSON library. They also addressed general code improvements and merged changes from the main branch and iPad redesign. These updates suggest active involvement in maintaining and enhancing the core functionalities of the iOS app, ensuring it leverages modern iOS features.
ipadiphoneipodtouchswift
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