Rafał Ruciński - Lead Software Engineer at Balyasny Asset Management L.P.

Rafał Ruciński

Lead Software Engineer at Balyasny Asset Management L.P.

Warsaw, Masovian Voivodeship, Poland

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Summary

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Rockstar

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Top School

Rafał Ruciński is a Lead Software Engineer based in Warsaw with 11 years of experience building robust front-end systems and guiding teams through complex UI and architecture changes. He combines deep practical expertise in React, TypeScript and CSS-in-JS with a track record of establishing component libraries, upgrading legacy codebases, and improving developer workflows at companies like Codility and Tooploox. At Tooploox he drove design-system adoption, performance-focused UI implementations, and resilient visual testing with Chromatic, while at Codility he championed linting, testing and front-end best practices. An active open-source contributor, Rafał has improved ESLint React rules and modernized template-literal tooling, showing attention to detail in code style and test coverage. He enjoys mentoring and technical leadership, and—less obvious—once implemented an efficient map-point grouping algorithm and even wrote a JS interpreter in Haskell as a side project, reflecting a strong curiosity for language-level detail.

11 years of coding experience

11 years of employment as a software developer

Bachelor's degree Informatyka, Bachelor's degree Informatyka at University of Warsaw

Polish, English

Github Skills (14)

testing10

babel610

babeljs10

javascript10

eslint10

lint10

template-literals10

react10

jsx10

babel-core10

ecmascript9

develop9

pretier9

prettify9

Programming languages (7)

TypeScriptC#CSSJavaScriptZigHTMLPython

Github contributions (5)

zspecza/common-tags

Nov 2017 - Nov 2021

🔖 Useful template literal tags for dealing with strings in ES2015+

Role in this project:

Full-stack Developer

Contributions:7 releases, 115 commits, 51 PRs in 4 years

Contributions summary:Rafał primarily focused on upgrading dependencies and refactoring the codebase. They updated the "ava" testing library and replaced the "babel-preset-stage-0" and "babel-preset-latest" presets with more modern alternatives. Furthermore, the user made changes to tests and utilities, demonstrating a focus on ensuring the project's stability and maintainability. They also implemented new features and addressed a previous issue by adding and adjusting code in multiple files.

kebab-casetemplate-literalstringsjavascriptliteral

jsx-eslint/eslint-plugin-react

May 2017 - May 2017

React-specific linting rules for ESLint

Role in this project:

Front-end Developer

Contributions:11 commits, 5 PRs, 36 comments in 16 days

Contributions summary:Rafał's contributions center on fixing bugs and improving the `jsx-curly-spacing` rule within the ESLint React plugin. Their work involved addressing issues related to spacing and newlines within JSX curly braces, especially concerning object literals and multiline scenarios. They modified test cases to validate the rule's behavior across various configurations. The user also updated the rule's logic to correctly handle spacing and newline requirements, ensuring consistent code style.

reactlintlintereslintjavascript

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