Marcin Grzywaczewski
Marcin Grzywaczewski
Expert Software Engineer

Fullstack developer in heart, specializing in frontend. React enthusiast since alpha versions, now diving into React Native world. Aims for simple & correct software by understanding business. Playing computer games & lifting weights in his free time - ask me about animal facts if you want to lose an hour of your life.


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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