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About us
We are a small but extremely skilled, highly specialized group of React Native experts, all with strong backgrounds in the open-source community, and we're here for your larger projects which require that next level of talent.

Whether you need an app or looking to boost your team expertise in React Native, React.js and Javascript, We are ready to help!
Type
software_house
Company size
35-45
Industry
Information Technology
Headquarters
Wrocław
Our team
Mike Grabowski
Co-Founder & CTO
Mike is a React Native core contributor and the author of libraries like RNPM and Haul. Mike makes sure our infrastructure performs well to its limits.
Noemi Rozpara
Frontend Developer
Regardless of technologies used in a project, Noemi takes care of the best User Experience possible. Noemi spends her spare time in dance classes and she's a big fan of terrain runs.
Satyajit Sahoo
Frontend Developer
Satya is in Facebook’s 2016 TOP 5 external contributors list. You can find him everywhere. Satya is also a React & React Native ninja that will make your apps stand above the crowd.
Michał Pierzchała
Team Leader & Software Engineer
UI engineer passionate about building mobile and web experiences, high quality JS tooling and Open Source. Core Jest & React Native Community contributor. Space exploration enthusiast.
Jakub Kłobus
Team Leader & Software Engineer
Software developer working at Callstack since the beginning. After mastering web, he moved to React Native where he focuses on making Reason React Native next big thing.
Mike Chudziak
Head of Technology
Software developer working all across the stack, always glad to help you manage the technical aspect of a project and lead your team to success. Experienced in the native mobile and web development. Big lover of GraphQL.
Our offices

Wrocław, Prosta 36 - 51.103192, 17.0208402

Company insight
Take a closer look
Meet Callstack
Callstack people are not only great developers and core contributors to React Native. We are also a close-knit team of amazing people, enjoying our jobs as much as our after-work hobbies and passions.
Meet the Callstack team and see if we share some of your passions too.
Job offers
warszawa/ krakow/ wroclaw/ poznan/ trojmiasto/ remote/ slask/ world/ bialystok/ bielsko-biala/ bydgoszcz/ czestochowa/ kielce/ lublin/ lodz/ olsztyn/ opole/ torun/ rzeszow/ szczecin/ zielona_gora/
all/javascript all/html all/php all/ruby all/python all/java all/net all/scala all/c all/mobile all/testing all/devops all/ux all/pm all/game all/analytics all/security all/data all/go all/sap all/support all/other
  • Senior React/React Native Developer
    12 000 - 16 000 PLN net 2020-09-25 13:00:09 UTC
    Callstack Prosta 36 Wrocław
  • C++ / React Native Windows Developer
    14 000 - 18 000 PLN net 2020-09-24 09:00:09 UTC
    Callstack Prosta 36 Wrocław
  • Mobile Developer (iOS / Android)
    14 000 - 17 000 PLN net 2020-09-24 10:00:07 UTC
    Callstack Prosta 36 Wrocław
  • React / React Native Developer
    8 000 - 12 000 PLN net 2020-09-21 06:04:00 UTC
    Callstack Prosta 36 Wrocław
  • Senior React/React Native Developer
    12 000 - 18 000 PLN net 2020-09-21 05:57:00 UTC
    Callstack Prosta 36 Wrocław
  • IT Project Manager
    10 000 - 13 000 PLN net 2020-04-23 08:00:00 UTC
    Callstack.io Sp. z o.o. Prosta 36 Wrocław
  • Senior React Native Developer/Remote PL Remote
    12 000 - 20 000 PLN net 2020-04-17 23:00:00 UTC
    Callstack Prosta 36 Wrocław
  • JavaScript Developer React/React Native
    10 000 - 18 000 PLN net 2019-11-07 09:00:07 UTC
    Callstack Rybacka 7 Wrocław
  • JavaScript Developer (React Native) - Remote Remote
    12 000 - 16 000 PLN net 2019-05-27 10:33:34 UTC
    Callstack Centrum Poznań
  • JavaScript Developer (React Native) - Remote Remote
    12 000 - 16 000 PLN net 2019-05-27 10:33:36 UTC
    Callstack Centrum Warszawa
  • React.js Developer
    8 000 - 12 000 PLN net 2019-04-25 13:10:21 UTC
    Callstack.io Sp. z o.o. Rybacka 7 Wrocław
  • JavaScript Developer (React Native)
    12 000 - 16 000 PLN net 2019-06-24 07:32:22 UTC
    Callstack.io Sp. z o.o. Rybacka 7 Wrocław
  • JavaScript Developer (React)
    8 000 - 12 000 PLN net 2019-06-17 08:23:27 UTC
    Callstack Rybacka 7 Wrocław
  • JavaScript Developer (React Native) - Remote Remote
    12 000 - 16 000 PLN net 2019-06-24 07:32:08 UTC
    Callstack Rybacka 7 Wrocław
  • Web Developer
    5 000 - 8 000 PLN net 2019-04-09 08:21:21 UTC
    Callstack Rybacka 7 Wrocław
  • Senior JavaScript/React Native Developer
    12 000 - 16 000 PLN net 2019-03-18 12:41:35 UTC
    Callstack Rybacka 7 Wrocław