Jakub Jirutka
System Engineer at Faculty of Electrical Engineering, Czech Technical University in Prague
Prague, Prague, Czechia
Summary
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Rockstar🎓
Top SchoolJakub Jirutka is a systems engineer based in Prague with 14 years of experience focused on programming languages, operating systems, and infrastructure research and development. He blends academic rigor from CTU with practical engineering, contributing to prominent open-source projects like DefinitelyTyped, flow-typed and nginx/njs where he improved TypeScript and Flow type safety and added async/await and other language-level support. An Alpine Linux developer and prolific maintainer, he consistently refactors and hardens tooling—from JSON schema generation and YAML serialization to REST exception handling and RSQL parsing—emphasizing maintainability and correctness. Known for "show me the code," he pairs curiosity with hands-on contributions across diverse ecosystems (Ruby, TypeScript, shell tooling), and quietly improves developer experience through better types, tests, and adapters.
14 years of coding experience
Mechanical Engineering, Mechanical Engineering at Secondary Technical School in Mladá BoleslavBachelor’s Degree (Bc.), Web and Multimedia, Bachelor’s Degree (Bc.), Web and Multimedia at Faculty of Electrical Engineering, Czech Technical University in PragueMaster’s degree (Ing.), Web Engineering, Master’s degree (Ing.), Web Engineering at FIT CTU in Prague
Czech, English
Stackoverflow
10,555reputation
2.1mreached
84answers
0questions
html
top-1%
rest
top-5%
ansible
top-5%
alpine-linux
top-5%
timer
top-5%
spring-security
top-5%
Github Skills (81)
parserator10
parser10
flow-control10
json-schema10
testing10
autocomplete10
typescript-definitions10
type-definition10
ruby10
type-system10
javas10
elasticsearchquery10
aws-elasticsearch10
elasticsearch10
rest-api10
Programming languages (37)
Github contributions (5)
DefinitelyTyped/DefinitelyTyped
Jul 2019 - Apr 2021
The repository for high quality TypeScript type definitions.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:5 reviews, 6 commits, 10 PRs in 1 year 9 months
Contributions summary:Jakub primarily contributed to type definition updates and improvements within the DefinitelyTyped repository. They updated existing type definitions for libraries like `trouter`, `async-stream-generator`, `node-cleanup`, and `marked`, fixing potential issues and ensuring compatibility with newer versions. The user also added new type definitions for `rollup-plugin-add-git-msg` and enhanced existing types, demonstrating proficiency in TypeScript and its application in providing accurate and reliable type information.
typescript-definitionstype-definitionshigh-qualitydtsdefinitions
ruby/psych
Aug 2014 - Jan 2015
A libyaml wrapper for Ruby
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 commits, 1 PR, 17 comments in 5 months
Contributions summary:Jakub primarily focused on improving string serialization within the `psych` library, which is a YAML parser for Ruby. Their contributions included fixing bugs related to string quoting and handling of line breaks in YAML output, ensuring correct style (plain, folded, literal) is applied based on the string's content and the line width setting. They also optimized the code by removing an unnecessary variable and pre-setting a configuration parameter. Furthermore, added new tests to cover the various scenarios with string styles.
ruby-gemlibyamlpsychrubyyaml-parser
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