Christoph Olszowka
Chief Technology Officer at M-TRIBES
Hamburg, Germany
Summary
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RockstarChristoph Olszowka is a seasoned technology leader and CTO based in Hamburg with 17 years of experience building reliable backend systems and leading engineering teams. He combines hands-on engineering—demonstrated by contributions to widely used Ruby projects like SimpleCov and the Ruby Toolbox catalog—with strategic oversight at M-TRIBES and as a long-term freelancer. His strengths include test automation, tooling, and improving code quality through rigorous validation and error handling. Colleagues rely on him to translate complex requirements into maintainable software and robust developer workflows. Notably, he has a track record of adding practical features and schema-driven safeguards to open-source ecosystems, showing an orientation toward long-term project health as well as shipping value.
17 years of coding experience
9 years of employment as a software developer
Stackoverflow
842reputation
87kreached
19answers
2questions
Github Skills (27)
schema-validation10
json-schema10
testing10
rspec10
coverage10
validation10
ruby10
json-validation10
code-coverage10
test-unit10
json-schema-validator10
unit-test10
test-automation10
rubocop9
software-quality9
Programming languages (6)
Github contributions (5)
simplecov-ruby/simplecov
Aug 2010 - Dec 2022
Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:501 commits, 35 PRs, 51 pushes in 12 years 6 months
Contributions summary:Christoph's contributions primarily revolved around developing the core functionality of the code coverage library, SimpleCov, written in Ruby. They implemented initial imports of library components and added test cases to SourceFile and SourceFileLine. Furthermore, the user focused on ensuring argument validation and improving error handling. They also added grouping features for coverage analysis and implemented the initial features for a basic formatter.
railstestingsuitesrubymerging
rubytoolbox/catalog
Oct 2017 - Oct 2022
The Ruby Toolbox library catalog. If you'd like to contribute to the categorizations of Ruby open source projects on the Ruby Toolbox this is the place you can do so 📬🎉
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:3 reviews, 622 commits, 640 PRs in 5 years
Contributions summary:Christoph primarily contributed to the development and maintenance of the Ruby Toolbox catalog. Their work involved setting up essential tooling and testing frameworks such as RSpec, Rubocop, and JSON schema validation, which improved code quality. They implemented features such as exporting the catalog as JSON and added schema validation to ensure data integrity. In addition, the user ensured all project entries in the catalog exist on rubygems.org.
placetoolboxcatalogruby
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