Karol Majewski
Lower Silesian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolKarol Majewski is a product-focused front-end engineer with 9 years of experience building performant, maintainable web applications and design systems across startups and enterprise teams. He led migrations to TypeScript, improved performance and observability at scale (e.g., CDN optimizations at Unsplash), and helped bootstrap an award-winning Industry 4.0 product at RHI Magnesita while acting as a servant leader for front-end teams. A prolific contributor to TypeScript type definitions in DefinitelyTyped, he pays close attention to developer experience and long-term maintainability. His interests span networks, collective intelligence, incentive design and tools for thought, reflecting a systems-minded approach he calls “software permaculture.” Colleagues rely on him for refactors, cross-project migrations, and creating learning rituals that reduce accidental complexity and improve team flow.
9 years of coding experience
8 years of employment as a software developer
Master of Science (M.Sc.) Power Engineering, Master of Science (M.Sc.) Power Engineering at Wrocław University of Science and Technology
Polish, English
Stackoverflow
24,744reputation
4.5mreached
314answers
1question
jsx
top-1%
typescript
top-1%
typescript-generics
top-5%
javascript
top-5%
Github Skills (19)
typesc10
typescript10
typescript-definitions10
type-definition10
type-system10
dts10
typescript-types10
nodejs10
typescripts10
react10
jsx10
javascript9
typescript-generics9
tsconfig6
union-types6
Programming languages (5)
Github contributions (5)
DefinitelyTyped/DefinitelyTyped
Apr 2018 - May 2020
The repository for high quality TypeScript type definitions.
Role in this project:
Frontend Developer
Frontend DeveloperContributions:4 reviews, 16 commits, 12 PRs in 2 years 1 month
Contributions summary:Karol's primary focus within the repository was on the type definitions for various React components, indicating a strong emphasis on improving the developer experience. The commits show the addition and modification of TypeScript definitions for libraries like `task-worklet`, `rc-switch`, and `use-persisted-state`, alongside corrections in existing definitions. They also addressed a compatibility issue within `react-router`, showcasing attention to detail.
typescript-definitionstype-definitionshigh-qualitydtsdefinitions
WrocTypeScript/past-events
Feb 2019 - Jul 2020
Here you can find all our past events resources
Contributions:34 commits, 1 PR, 33 pushes in 1 year 5 months
jseventslodashjavascriptjavascript-tools
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