Teo Ljungberg
Staff Engineer at Mentimeter
Stockholm, Sweden
Summary
🤩
Rockstar🎓
Top SchoolTeo Ljungberg is a Staff Engineer based in Stockholm with 11 years of experience building and leading backend teams across startups and scale-ups, currently driving engineering at Mentimeter. He has held senior leadership roles including VP of Engineering and Head of Backend Development, blending hands-on coding with team and architecture ownership. A seasoned Ruby/Rails contributor, Teo has improved widely used open-source projects such as thoughtbot/administrate and vim-fugitive, focusing on compatibility, test quality, and bug fixes. He brings a pragmatic engineering style—refactoring legacy systems, hardening CI and background job flows, and improving developer experience—rooted in a mathematics background from Lund University. Teo’s track record shows a mix of deep technical craftsmanship and effective leadership across product-focused organizations.
12 years of coding experience
8 years of employment as a software developer
Norra RealMathematics, Mathematics at Lund University
Swedish, English
Github Skills (21)
git10
ruby-rails10
dashboard10
admin10
testing10
vimscript10
rspec10
rails10
refactor10
ruby10
github-api10
refactoring10
test-automation10
command-line-interface9
test-framework9
Programming languages (18)
Github contributions (5)
houndci/hound
Feb 2015 - Mar 2017
Automated code review for GitHub pull requests.
Role in this project:
Backend Developer
Backend DeveloperContributions:69 commits, 159 PRs, 423 pushes in 2 years 1 month
Contributions summary:Teo primarily contributed to refactoring and improving the backend API and internal processes. They renamed and refactored invitation-related jobs, enhancing the clarity and explicit use of GitHub tokens within the `GithubApi` class. Additionally, the user made several updates to improve the handling of configuration errors and the performance of background jobs. Further contributions include improvements to error reporting and code maintenance across several different files related to the Hound CI project.
continuous-integrationhoundjavascriptrailsreact
thoughtbot/gitsh
Jan 2015 - Jun 2017
An interactive shell for git
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:8 commits, 7 PRs, 15 pushes in 2 years 5 months
Contributions summary:Teo's commits primarily focus on upgrading testing dependencies and refactoring existing test code. They upgraded the RSpec testing framework, replacing deprecated methods and updating dependencies like `parslet`. Further commits demonstrate the modification of test files, including the modification of test helper files, to align with updated RSpec functionality and to resolve deprecation warnings. These changes indicate a focus on maintaining and improving the test suite's quality.
interactive-shell
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