Expert
Łukasz Walczak

Łukasz
Walczak

Software developer

JavaScript developer who likes finding the most all-purpose solutions. He is characterised by precise and methodical approach to the problem. Open to new technologies and development opportunities.
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Contributions
Łukasz Walczak's Blue Github Chart
Technologies
  • Backend
  • Node.js, Hapi.js
  • MongoDB
  • Firebase
  • Frontend
  • React, Redux
  • CSS, Jest
  • Flowtype
  • Styled-components
  • Mobile
  • React Native
  • Other
  • Flow, Auth0, Jira
  • SCRUM, Socket.IO
“
“We at We Are Voice realized the need to have a React Native app for our choral music service. In that process, Callstack became a natural development partner for us given their deep knowledge of the platform. Despite the geographical distance, our collaboration has been successful with strong deliveries on time, together with a good communication.”
Martin Rolinski, CEO
We Are Voice

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Paweł Trysła

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Callstack.io Sp. z o.o. seated in Wrocław, Poland, at Rybacka 7, 53-656 Wrocław, entered in the Register of Entrepreneurs of the National Court Register, kept by the District Court of Wrocław-Fabryczna in Wrocław, VI Commercial Division of the National Court Register under the number 0000606530, with share capital of PLN 8,000.00, with tax identification number (NIP) 8992785616, and statistical number (REGON) 363921820.