Joakim Kolsjö
Software Developer at Auctionet.com
Greater Stockholm Metropolitan Area Sweden
Summary
👤
Senior🎓
Top SchoolJoakim Kolsjö is a pragmatic full-stack software developer with 17 years of experience building and maintaining Ruby-backed web applications and developer tooling from the Greater Stockholm area. He combines deep Ruby/Rails expertise with practical automation skills—test parallelization, CI, configuration management and server provisioning—having improved gems like parallel_tests and built UI-focused enhancements for Redmine backlogs. At Auctionet he expanded into Elixir and Elm while owning both backend and frontend concerns and the tooling that keeps teams productive (dev-boxes, Heroku, Kubernetes). He has a strong track record of raising engineering quality through TDD, CI, and process changes, and is equally comfortable tweaking CSS/JS for a better UX as optimizing test partitioning for speed. Colleagues rely on him to bridge product-facing features and the behind-the-scenes automation that makes continuous delivery reliable.
16 years of coding experience
3 years of employment as a software developer
Programming, mostly .NET., Programming, mostly .NET. at Nackademin
Stackoverflow
106reputation
9kreached
3answers
0questions
Github Skills (24)
javascript10
plugin-development10
css10
rspec10
redmine-plugins10
plugin10
ruby10
parallel-testing10
front-end-development10
parallel-tests10
test-automation10
testing9
user-interface8
interface-design8
ui-design8
Programming languages (10)
Github contributions (5)
grosser/parallel_tests
Jun 2009 - Feb 2010
Ruby: 2 CPUs = 2x Testing Speed for RSpec, Test::Unit and Cucumber
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:29 commits in 8 months
Contributions summary:Joakim primarily contributed to improving the `parallel_tests` Ruby gem. Their work focused on refining the core functionality of the gem, specifically on how tests are grouped and executed in parallel to improve testing speed. They implemented changes to the test partitioning logic, addressed merge conflicts, and optimized the code for better readability. The user also made improvements to the test setup and output handling.
speedtestingrubyunitspec
backlogs/redmine_backlogs
Jan 2010 - Jan 2010
A Redmine plugin for agile teams
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:11 commits in 1 day
Contributions summary:Joakim primarily contributed to the front-end and UI aspects of the Redmine backlogs plugin. They modified CSS stylesheets to adjust the visual appearance, layout, and color scheme of the user interface elements. Additionally, the user implemented and modified JavaScript code to add features such as hiding/showing tasks and closed backlogs, as well as updating the application's preferences. These commits demonstrate a focus on enhancing the user experience and visual presentation of the Redmine plugin.
agileredmine-pluginrubyredmine
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