Marek Grzybek, Developer in Warsaw, Poland
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Marek Grzybek

Verified Expert  in Engineering

Software Developer

Warsaw, Poland
Toptal Member Since
December 22, 2017

Marek is a highly skilled JavaScript enthusiast who’s worked with all the major frameworks and front-end technologies. More than seven years of experience in the web development industry have given him a solid skill base so that, when involved in a project, he evaluates a situation and devises a proper solution to a given problem. Marek communicates extremely well and works well in teams of all sizes.

React, Redux, Redux-Saga, TypeScript, react-spring, Reselect, Recompose...
AngularJS, JavaScript, Express.js, Node.js, Redux, React, Angular, CSS, Pug
AngularJS, JavaScript, jQuery, Backbone.js, MongoDB, CSS, Pug




Preferred Environment

PostgreSQL, JavaScript, Git, Arch Linux, React, TypeScript

The most amazing...

...project I've coded is a Lightbox library in pure JavaScript.

Work Experience

Senior Full-stack Developer

2018 - 2021
  • Wrote the whole web app from scratch as a full-stack developer, leading a team of around three other developers. Collaborated closely with the client on the design, UX, user acquisition, and retention.
  • Prepared an advanced asynchronous server-side rendering solution that allowed prefetching required data on the server based on the currently signed-in user, which allowed first-class SEO support.
  • Implemented a service processing users' voice clips to trim silences, speed up the audio and normalize volume using FFmpeg.
Technologies: React, Redux, Redux-Saga, TypeScript, react-spring, Reselect, Recompose, Server-side Rendering (SSR), TypeORM, TypeDI, PostgreSQL, BullMQ, AWS Elastic Beanstalk, PostCSS, Docker, Docker Compose, BEM, Koa, Node.js, FFmpeg, nexrender, Redis, Algolia, GetStream, Responsive Design, Datadog, Puppeteer, Jest, CSS

JavaScript Developer

2016 - 2018
  • Created an application for visual creation of natural language processing bots.
  • Developed an analytics application for basketball coaches.
  • Maintained an online identity verification system.
  • Implemented a redesign of startup product website.
  • Created a React UI Kit for company use.
Technologies: AngularJS, JavaScript, Express.js, Node.js, Redux, React, Angular, CSS, Pug

Software Developer

2015 - 2016
  • Created a web application for managing indoor location-tracking based on beacons.
  • Maintained a large-scale eCommerce company analytics web application.
  • Implemented E2E tests with Selenium.
Technologies: AngularJS, JavaScript, jQuery, Backbone.js, MongoDB, CSS, Pug

Freelance Web Developer

2009 - 2015
Freelance Work
  • Created simple showcase websites for small businesses in the local area using the latest HTML5/CSS3 features like canvas, drag-n-drop, and transitions.
  • Built a custom CMS with PHP and MySQL from scratch.
  • Applied progressive enhancements to support users on legacy browsers and devices.
  • Integrated Google Analytics for user-origin tracking.
Technologies: JavaScript, MySQL, PHP, jQuery, CSS3, HTML5, CSS

This Lightbox script was written in pure JavaScript for ease of use and simplicity. It has a modern and minimal look, and the features support swipe gestures on touch-screen devices, full-screen mode, responsive images, and CSS3 transitions. It also supports a variety of browsers, including IE8+. It has received over 2,000 stars on GitHub.
A React-based web app to voice your mind on podcasts. I acted as a full-stack developer in charge of writing the app from scratch and team-leading a couple of other developers. The app is using our custom solution for async server-side rendering.


ECMAScript (ES6), ES7, ES8, HTML5, TypeScript, Pug, HTML, CSS3, CSS, JavaScript, Sass, PHP, SQL


Material UI, YARN, AngularJS, Redux, Koa, UI-Router, Angular Material, Jest, Angular, Express.js, Bootstrap


Web Worker, Underscore.js, Lodash, React, Node.js, Ramda, Redux-Saga, React Router, jQuery, REST APIs, Backbone.js, react-spring, Reselect, Recompose, FFmpeg, Puppeteer, Sinon.JS, RxJS, Chai


JSX, NPM, Yeoman, Browserify, PostCSS, Webpack, Gulp, Bower, GitHub, Redux Thunk, Git, Zsh, Babel, Docker Compose, Flow, Sublime Text, Figma, Mocha, BrowserStack, GitHub Pages


Visual Studio Code (VS Code), Linux, AWS Elastic Beanstalk, Algolia, Docker, Arch Linux


Front-end, Flux Architecture, ESLint, Full-stack, Enzyme, Chrome Extensions, TypeORM, Server-side Rendering (SSR), TypeDI, BullMQ, nexrender, GetStream, Responsive Design, WebSockets, GitFlow, Redux-observable


Functional Programming, Agile Software Development, BEM


PostgreSQL, Redis, Datadog, MySQL, MongoDB

2017 - 2019

Master of Science Degree in Computer Science

Wrocław University of Science and Technology - Wrocław, Poland

2013 - 2017

Bachelor of Science Degree in Computer Science

Wrocław University of Science and Technology - Wrocław, Poland

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