Bartosz Łaniewski
Lead Frontend Developer at Calamari
Białystok, Podlaskie Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolBartosz Łaniewski is a Lead Frontend Developer with 11 years of experience building scalable, high-performance web and mobile applications, currently based in Białystok, Poland. He specializes in React and TypeScript and brings a product-minded engineering approach that consistently balances usability, performance, and maintainability. Bartosz has led cross-functional teams and initiatives to reduce technical debt, improve developer experience, and scale platforms for enterprise clients. He has contributed to notable open-source work, including meaningful TypeScript and accessibility-focused improvements to the popular react-bootstrap library. Comfortable across web and React Native mobile stacks, he excels at translating customer needs into production-ready solutions while iterating rapidly with stakeholders. His background in mathematics and computer science underpins a methodical, data-driven approach to solving complex frontend challenges.
11 years of coding experience
7 years of employment as a software developer
Bachelor's degree Mathematics and Computer Science, Bachelor's degree Mathematics and Computer Science at Université Paris Cité
Polish, French, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (11)
typescript10
javascript10
typescripts10
react10
typescript-types10
react-component9
bootstrap9
react-components9
bootstra9
props8
prop8
Programming languages (10)
Github contributions (5)
react-bootstrap/react-bootstrap
Mar 2019 - Mar 2019
Bootstrap components built with React
Role in this project:
Front-end Developer
Front-end DeveloperContributions:6 commits, 2 PRs, 13 comments in 1 day
Contributions summary:Bartosz contributed to the `react-bootstrap/react-bootstrap` repository by enhancing the Modal component. They added and refined the `restoreFocusOptions` prop, including type definitions. Furthermore, the user removed a redundant type definition and the default prop for `restoreFocusOptions`, improving code clarity and maintainability within the React-based component library. They also added the `scrollable` prop to the `ModalDialogProps` interface and updated the TypeScript version, reflecting attention to detail and adherence to best practices.
reactbuilt-with-reactbootstrap-componentsjavascriptreact-components
Bartozzz/get-link
Apr 2016 - Apr 2021
Builds an absolute URL based on an absolute base URL and a link. Makes sure that both base and link are valid, on the same host and HTTP/HTTPS protocol. Stripes hashes. WHATWG URL compatible.
Contributions:1 release, 81 commits, 49 PRs in 5 years 1 month
http-headerurl-parserlinkwhatwg-urlbitly
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