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Marcin Grzywaczewski
Marcin Grzywaczewski
Expert Software Engineer

Full-stack developer by heart, now specializing in React/React Native & frontend architectures. He loves to understand how things work - whether it is code, or your business. Became a Mentor for web architecture fields at Callstack and loves sharing knowledge with people. A big fan of Rust, that hopes it'll change development environment forever for a faster & more reliable software.An animal lover! You can ask him anything about our more scaly friends. :)

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I provide expertise in


  • Node.js
  • Ruby on Rails
  • Express
  • PostgreSQL
  • MySQL
  • Redis
  • Haskell
  • GraphQL
  • Rust
  • Warp


  • JS
  • React
  • Redux
  • Apollo
  • React-Query
  • React Native Web
  • jQuery
  • Backbone
  • RxJS
  • Ramda


  • React Native


  • TypeScript
  • Webpack
  • Jest
  • Elm
  • ESBuild
  • SWC

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