Hi there, I'm David.
I enjoy building things with JavaScript, TypeScript, React and other web technologies. I care about good design and always try to see things from the perspective of different users. I am not not looking for new work right now, but if you'd like to chat about anything, feel free to send me a message.
For the social network ITnetwork.cz, I developed a spreadsheet component using their custom component system. This included creating a library for evaluating spreadsheet formulas, support for conditional formatting, and thorough unit testing.
I resolved a long open issue of adding a proper module system and bundler to the project. This involved getting familiar with an unknown codebase and making extensive refactorings. But the effort was worth it for the great feedback from the maintainers!
For a client, I designed and developed a multilingual website for booking tourist activities using Gatsby.js with React and SASS on the frontend and Express.js on the backend. I learned how to take a website from initial idea, to being launched and serving customers.
Advent of Code is an annual advent calendar of 50 programming puzzles, ranging from "Oh, this is easy!" to "How on earth do I get the elephants out before the volcano erupts?". Although I didn't make it before Christmas, I managed to solve every puzzle from 2022.
Inspired by a physics class in highscool, I developed an app, which visualizes relative paths of planets with a chosen planet as the point of view. The app supports saving and loading configured cellestial bodies from a file and exporting the visualization as an image.
On the social network ITnetwork.cz, a common issue was that new users often did not correctly mark source code in forum discussions. To help alleviate this problem, I was tasked with developing a small JavaScript library that distinguishes between regular text and blocks of source code, and can be configured to detect code in a number of different programming languages.
I am comfortable building all sorts of things with JavaScript, whether standalone or in combination with React.js. I'm also no stranger to building responsive websites and user interfaces using HTML and CSS or SASS.
Recently, I have started using TypeScript, and so far it seems pretty intuitive, thanks to my previous experience with other statically typed languages like C# and F#.
When developing the backend of a website, I tend to reach for Node.js these days, be it in combination with Express.js or a full-stack framework like Next.js.
I also have experience with C# and the .Net platform, but it has been a while since I last used them. When needed, I have no problem doing some database queries in SQL.
I know Git well enough to use it on a daily basis: committing, interactively rebasing, bisecting, merging, pushing/fetching from a remote repository or submitting a pull request to GitHub are no strangers to me.
Besides various build tools, some development tools worth mentioning are React Developer Tools for debugging and profiling React apps and Jest for unit testing.
Besides software development, I'm also interested in design and UX and can work with vector and bitmap-based graphics editors.
As for non-programming languages, I am fluent in Czech and German. My English skills are around B2/C1 on the CEFR scale. I read and listen to English content daily and have no problems using it for regular communication. Out of interest, I'm also learning Swedish.
My interest in programming started in high school, when my dad asked me for a way to send mass emails. For reasons that are still not entirely clear to me, I decided to build an app for this purpose. Little did I know that this would lead me from teaching myself C# and a deep dive into the SMTP protocol, to later getting a degree in Information Technologies and becoming a web developer.
In my spare time, I enjoy playing chess, hiking, and being outdoors. I am curious about both natural and programming languages. I'm currently in the process of learning Swedish, which has been a lot of fun so far! I also enjoy teaching people what I know and helping others understand new concepts.
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