Meet the team

Meet the Callstack experts

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

Join us

Executive Team

Behind great software is a strong foundation. Our marketing, business, and HR teams make sure everything’s in place, from strategy and operations to supporting the people behind the code.

Mike Grabowski
Mike Grabowski
CTO & Founder
Grzegorz Wołodko
Grzegorz Wołodko
Chief Delivery Officer
Radek Chrzempka
Radek Chrzempka
Head of People & Culture
Michał Chudziak
Michał Chudziak
Director of Engineering
Ada Gawrysiak
Ada Gawrysiak
Head of Growth

Core Contributors

We are an open source–driven team that loves going the extra mile with.  Whether it’s client work or community projects, we’re all in.

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

JOIN US

Build with agents before everyone else does.

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