Bart Kozal

I have over a decade of experience in leading, software engineering, and graphic design. I'm passionate about data visualization and ML.

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

Software Engineering

I am a Software Engineering Lead with professional experience in TypeScript, Ruby, and Swift. I have over a decade of leading and developing projects across diverse domains including cybersecurity, web applications, desktop+mobile apps, and games. My career spans working with startups, scaleups, and large enterprises, where I have consistently delivered innovative, high-impact solutions.

TypeScript

JavaScript

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. My most popular repositories are:

Product Development

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

Side Projects

I was a solopreneur for over a year and created a 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 game collection

Checkers for iMessage

Board game for iOS10 iMessage

Jottings

Real-time collaboration in Markdown

Game Night

Schedule board game nights

Ukulele Tabs

Translate music notes to ukulele tabs

Major Scales

Practice major scales

Drawing, Graphic Design & Animation

I enjoy spending my free time drawing. I know how to use all popular graphic software including 3D software like Blender. I self-studied 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 play piano. In 2021 I started attending jazz piano lessons andstudying music theory. I know how to use DAW software. I designed sound for my animations.

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.