Karol Krzosa

I like building software that feels alive: fast editors, weird tools, compilers, graph viewers, and anything that helps me understand systems better.

This site is mostly a home for things I enjoy making.

I spend a lot of time in C/C++ and Python, usually chasing one of three things: speed, simplicity, or better developer experience. I love projects where I can build the whole thing end to end and really understand every layer.

Outside of work, I keep coming back to personal tooling: text editors, profilers, compilers, and graphics experiments. If a tool annoys me, I often try building my own version.

Gitea | GitHub | LinkedIn | Email

Projects

te (Text Editor) | Source

My from-scratch native editor and my favorite long-term side project.

• Built the editor core manually: buffers, commands, rendering, and interaction model.
• Focused on responsiveness and clean workflows instead of feature bloat.
• I actually use it for day to day coding!

Visualizer (LivePlot) | Source

A tool for plotting live data from running programs through shared memory.

• Built because I wanted quick instrumentation without building full custom UI every time.
• Supports several plot styles and large point counts in real time.
• Great for profiling sessions and "what is the program doing right now" moments.

Compiler / Language Work (lc_lang, corelang)

These are "learn by building" language projects where I explored parsing, typing, and code generation.

• Implemented compiler pipelines and language experiments in C/C++.
• Spent a lot of time on pragmatic design, C interop, and debugging generated code.
• Useful as both learning artifacts and playgrounds for ideas.
• Ported it to WASM which you can try here!

Software Rasterizer | Source

One of my favorite deep dives: CPU 3D rendering with SIMD and multithreading.

• Implemented clipping, depth, texturing, blending, and tile-based work distribution.
• Optimized with AVX/AVX2/FMA.
• A pure "because this is cool and I want to understand it deeply" project.

Transcript Browsers | (Desktop source, WASM source)

Search tools for large subtitle archives with direct jump-to-timestamp navigation.

• Desktop version for local transcript search.
• WASM version for quick web publishing and sharing.
• Built from my own need to search technical lecture archives quickly.
• Jonathan Blow transcript browser online here

The rest

• args.h - single-header argument parser for C/C++.
• vscode_ctags_plugin - ctags navigation in VS Code.
• sublime_text_remedybg_plugin - RemedyBG integration for Sublime Text.
• Click: Implemented a pathfinding visualizer in my programming language (C: