Lutz Lengemann
Software Engineer Teamlead at Milecrew
Celle, Lower Saxony, Germany
Summary
👤
Senior🎓
Top SchoolLutz Lengemann is a seasoned Software Engineer and Teamlead with 13 years of experience bridging hands-on development, architecture and product-facing roles across startups and consultancies. He has led teams and initiatives from founding an e‑commerce startup to senior engineering and principal roles, now steering engineering at Milecrew while previously shaping platforms at Tomorrow Labs. Technically rooted in Ruby/Rails, he contributes to high-profile open-source projects like Bundler/rubygems—improving the bundle viz command and adding integration specs—demonstrating attention to tooling and test quality. Comfortable across product management, sales and marketing, he combines strategic thinking with a developer’s enthusiasm for clean code and pragmatic architecture. Based in Celle, Germany, he brings an entrepreneurial mindset and a track record of turning complex requirements into maintainable systems.
13 years of coding experience
15 years of employment as a software developer
Business Administration, Business Administration at University of Cape TownDiploma Business Informatics Business Informatics, Diploma Business Informatics Business Informatics at Fachhochschule Wedel
German, English
Github Skills (12)
command-line10
dependency-management10
ruby10
command-line-interface10
bundler10
cli10
testing10
graphviz9
rubygems9
package-manager9
package-manager-tool9
test-automation8
Programming languages (16)
Github contributions (5)
rubygems/bundler
Feb 2016 - Feb 2016
Manage your Ruby application's gem dependencies
Role in this project:
Backend Developer
Backend DeveloperContributions:8 commits, 1 PR, 2 comments in 10 days
Contributions summary:Lutz primarily focused on improving the `bundle viz` command within the Bundler gem. Their contributions involved refactoring and updating the command's functionality, including how it handles options, specifically the `--without` option. They also added and refined specs for the `viz` command, which involved writing integration tests and addressing rubocop issues to maintain code quality.
dependenciesrubygemsbundlerrubydependency-manager
rubygems/rubygems
Feb 2016 - Feb 2016
Library packaging and distribution for Ruby.
Role in this project:Back-end Developer / QA Engineer
Back-end Developer / QA EngineerContributions:8 commits in 10 days
Contributions summary:Lutz focused on modifying the `bundler/cli/viz.rb` and `bundler/cli.rb` files related to the `viz` command, specifically handling options and dependencies for generating dependency graphs. They also made changes to the options used by the `viz` command. The contributions also included adding specs related to the `--without` option and fixing rubocop issues in the test files to improve code quality.
rubygemspackagingpackage-managerrubymruby
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