Bartłomiej Kozal

I have over 15 years of experience in software engineering and graphic design. I like climbing, drawing, playing piano, board games, graphic novels, and books.

Connect with me on LinkedIn, Instagram, Twitter, and GitHub.

Software Engineering

I started in C++ then professionally focused on Ruby, Swift, and JavaScript. Through all the years I worked on games, web applications, native, and mobile apps. I have experience working for startups, scaleups, and large companies in technologies like:

JavaScript

TypeScript

Node.js

React

React Native

Electron

Next.js

Vue.js

AngularJS

Ember.js

GraphQL

Swift

Objective-C

Ruby

Ruby on Rails

PostgreSQL

MongoDB

MySQL

Elasticsearch

Redis

RealmDB

Docker

Open Source

I developed over 30 open source libraries in various technologies and contributed to projects like Rails and ycmd. My most popular repositories are:

Product Development

Between 2012 and 2016 I was a core team member and then the CEO of a startup. Shelly Cloud was an automated hosting platform that made the deployment of Ruby applications painless. We hosted over 270 paying applications on 430 virtual servers. I worked in all areas required to built and run a successful product: user experience, front-end and back-end development, server administration, support, marketing, sales, and team management.

Side Projects

For over a year I was a solopreneur and created few indie products. One of them was promoted by Apple in the AppStore and reached over 130.000 users. Now they are all open-sourced. You can find them here:

Mood Tracker

Track daily mood with emojis

Echotags

Hands-free, Amsterdam audio guide

Coypu

Text-editor-like weekly planner

Games Tracker

Track your games collection

Checkers for iMessage

Board game for iOS10 iMessage

Jottings

Real-time collaboration in Markdown

Major Scales

Practice major scales

Ukulele Tabs

Translate music notes to ukulele tabs

Drawing, Graphic Design & Animation

I enjoy spending my free time pencil drawing. I know how to use all popular graphic software including 3D software like Blender. I was self-studying character design and animation. I was also working on procedurally generated graphic and physics simulations. I participate in drawing challenges like Inktober. Below you can see some of my work.

Pencil Drawing

Computer Graphics

Animation

UI/UX Design

Procedural Graphics

Music

I like playing piano. In 2021 I started attending jazz piano lessons and studying music theory. I know how to use DAW software. I designed sound for my animations. You can listen to some of my work below.

Sound Design

Turn on sound

Piano

Turn on sound

Other

My other hobbies besides coding, drawing, and playing jazz are: climbing, board games, graphic novels, and books.