Hi, I’m Justyna Wojtczak — a software developer, bead artist and long-time LCHF practitioner based in Poznań, Poland. I started this blog in 2016 to share what I do in my free time — which turned out to be a lot.
Over the years I’ve written about Ruby on Rails apps, AI prompt engineering, beadweaving patterns, cream taste tests, and even Minecraft-themed bracelets for my son. This blog is a mix of all of it.
Programming
I work primarily with Ruby on Rails and have been building web applications professionally for years. Recently I’ve been exploring AI — prompt engineering with LangChain and OpenAI, semantic search with RAG systems, and chatbot testing with deepeval. I write about these topics on this blog.
Beading
I’ve been beadweaving since 2017. My favourite techniques include peyote stitch, CRAW, herringbone and loom beading. I design my own patterns — from geometric SuperDuo bracelets to pixel-art Minecraft characters for my son. You can browse my beading projects here.
Nutrition
I’ve been following a low carb, high fat (LCHF) diet for many years. I’m the author of ketolabs.pl — a Polish resource about the ketogenic lifestyle. On this blog you can also find my heavy cream comparison test.
Other interests
3D printing, sewing, design and astrophotography.