Hi, I'm Jacek Galanciak

Twenty years of writing software, mostly Ruby. I move quickly on new product work, and I bring patience to mature Rails codebases. What I've shipped has tended to last – the major systems are still in production, several Rails majors later. In practice:

• product engineering: I care about what gets built and why, and I'm comfortable owning the whole thing, from first sketch to production
• software architecture: two decades of seeing which designs hold up as products grow and which ones slow teams down
• domain knowledge in HRIS, payroll, edtech, and real estate
• agentic engineering: I use AI agents heavily and build the harness around them: architecture they can read, docs that steer them, and checks that catch their mistakes. When an agent gets something wrong, I fix the harness so the next run gets it right.

I write about programming on my blog and build open source tools. quicksand.js (1.8k stars) is a vintage jQuery plugin for animated filtering and sorting. Want to see my workshop? My dotfiles repo goes back 14 years.

I'm currently Lead Engineer at Plane (YC W17, formerly Pilot), a global payroll and HR platform.