Ivan Kolmychek
Software Developer at Sobel.io
Stockholm, Sweden
Summary
👤
Senior🎓
Top SchoolIvan Kolmychek is a full-stack software developer based in Stockholm with 12 years of experience combining web development and systems/network administration. He has built production services across Ruby on Rails, Elixir/Phoenix, PHP (Yii2) and modern JS/TS stacks, and deployed them on cloud and container platforms including GCP, Docker, and Kubernetes. His open-source contributions to the widely used Yii2 framework improved GridView validation UX by surfacing filter errors directly in list views, reflecting an attention to developer and end-user experience. Comfortable across backend, frontend and ops, he excels at tightening the feedback loop between runtime validation and UI, a perspective shaped by years managing *nix systems and distributed services. Currently at Sobel.io, he brings practical cross-stack fluency and a steady focus on continuous skill growth to deliver reliable, maintainable products.
12 years of coding experience
12 years of employment as a software developer
National Technical University "Kharkiv Polytechnic Institute"
English, Ukrainian, Swedish
Stackoverflow
1,271reputation
87kreached
28answers
4questions
image
top-5%
Github Skills (17)
yii10
app-framework10
php-framework10
php10
web-framework10
image9
gridview9
html7
cat6
ruby-on-rails6
base646
sed6
unicode6
rspec6
linux6
Programming languages (17)
Github contributions (5)
yiisoft/yii2
Apr 2014 - Apr 2014
Yii 2: The Fast, Secure and Professional PHP Framework
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 commits in 4 days
Contributions summary:Ivan primarily focused on enhancing the error handling and validation aspects of the Yii2 GridView component. Their contributions involved adding error list display within the GridView and BaseListView, along with modifications to DataColumn to indicate validation errors within filter cells. This work improved the user experience by clearly displaying validation errors related to the filter model. These changes spanned multiple files and involved modifications to core rendering logic.
secureprofessionalchinese-simplifiedyiiphp
ivan-kolmychek/dotfiles
Apr 2015 - Mar 2025
Contributions:77 pushes, 3 branches in 10 years
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