Meet the team

Meet the Callstack experts

Core contributors, open-source maintainers, and product engineers building the tools and apps teams rely on.

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Executive Team

Meet the leaders guiding Callstack’s engineering, delivery, growth, finance, and people teams.

Mike Grabowski
Mike Grabowski
CEO & Founder
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Alex Rak
Alex Rak
CFO
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Grzegorz Wołodko
Grzegorz Wołodko
CDO
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Radek Chrzempka
Radek Chrzempka
Head of People & Culture
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Michał Chudziak
Michał Chudziak
Head of Engineering
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Ada Gawrysiak
Ada Gawrysiak
Head of Growth
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Engineering team

Engineers and open source contributors building React and React Native products, developer tools, and agentic workflows.

Luke Farrell
Luke Farrell
Senior Software Engineer
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Lech Kalinowski
Lech Kalinowski
Senior AI System Engineer
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Piotr Miłkowski
Piotr Miłkowski
Senior AI System Engineer
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Artur Morys-Magiera
Artur Morys-Magiera
Software Engineer
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Tomasz Misiukiewicz
Tomasz Misiukiewicz
Software Engineer
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Łukasz Chludziński
Łukasz Chludziński
Engineering Manager
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Łukasz Walczak
Łukasz Walczak
Software Engineer
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Thiago Brezinski
Thiago Brezinski
Software Developer
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Satyajit Sahoo
Satyajit Sahoo
Software Engineer
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Szymon Chmal
Szymon Chmal
Software Developer
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Robert Pasiński
Robert Pasiński
React Native Developer
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Piotr Trocki
Piotr Trocki
Software Engineer
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Piotr Tomczewski
Piotr Tomczewski
Software Developer
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Michał Pierzchała
Michał Pierzchała
Principal Engineer
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Mariusz Pasiński
Mariusz Pasiński
Software Engineer
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Maciej Jastrzębski
Maciej Jastrzębski
Software Engineer
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Kacper Rożniata
Kacper Rożniata
Software Engineer
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Kewin Wereszczyński
Kewin Wereszczyński
Software Engineer
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Hur Ali
Hur Ali
Software Engineer
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Dimitar Nestorov
Dimitar Nestorov
Software Engineer
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Bartosz Klonowski
Bartosz Klonowski
Software Engineer
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Eduardo Graciano
Eduardo Graciano
Software Engineer
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Burak Güner
Burak Güner
Software Developer
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Adam Horodyski
Adam Horodyski
Software Engineer
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Build products and tools with us

You'll work on the tools, infrastructure, and products defining AI-native engineering, alongside core contributors and open-source maintainers.

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