Michał Kalbarczyk
Warsaw, Masovian Voivodeship, Poland
Summary
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RockstarMichał Kalbarczyk is a pragmatic software engineer with roughly 20 years of commercial programming experience, specializing in designing, maintaining and optimizing sophisticated applications, web apps and backends. He brings deep practical knowledge across modern languages and stacks, with a penchant for prototyping, research and creating proof-of-concepts. An active open-source contributor, Michał has improved core Ruby tooling—contributing to projects like Opal (Ruby-to-JS) and enhancing the popular colorize gem—demonstrating strength in both interoperability and core library internals. Fascinated by hardware and retro computers, he pairs low-level curiosity with high-level system design. Based in Warsaw, he balances technical rigor with creative interests such as guitar and wide-ranging musical tastes, signaling a blend of analytical and creative problem-solving.
19 years of coding experience
Polish, English
Stackoverflow
147reputation
6kreached
0answers
5questions
Github Skills (20)
javascript10
rubygems10
testing10
opal10
ruby10
gemspec10
compiler-compiler10
gemfile10
compiler10
browser9
regular-expression8
rust6
driver6
borrowing6
linux-device-driver6
Programming languages (18)
Github contributions (5)
fazibear/colorize
Apr 2007 - Jan 2023
Ruby string class extension. It add some methods to set color, background color and text effect on console easier using ANSI escape sequences.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:4 reviews, 125 commits, 50 PRs in 15 years 11 months
Contributions summary:Michał primarily contributed to the `colorize` Ruby gem by adding new methods, implementing features, and refactoring existing code. They added methods for setting colors and modes in the console, ensuring compatibility with Ruby 1.9. Furthermore, the user added tests and cleanups, improving the overall quality and maintainability of the project. The user also refactored the code to use regular expression pattern matching.
stringconsoleescape-sequencesansi-escaperuby
opal/opal
Jul 2015 - Dec 2015
Ruby ♥︎ JavaScript
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:7 commits, 4 PRs, 10 comments in 4 months
Contributions summary:Michał primarily contributed to the Opal project by fixing bugs, improving its integration with JavaScript, and enhancing its core functionalities. They addressed issues related to DOM object interaction, JavaScript interoperability, and native Ruby object handling. Furthermore, the user implemented Proc support and associated tests. Their work spanned across multiple files, reflecting a focus on the core Opal library and its interaction with JavaScript.
jsv8-javascript-enginebrowserjavascriptruby
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