kukicola.io

Hello, I'm

Karol Bąk

Software engineer writing about backend, infrastructure, AI, and open source.

About Me Read the Blog

What I Build

Sidekiq extension that adds the ability to debounce job execution.

View on GitHub →

High-performance ClickHouse client that uses Native data format and persisted connections.

View on GitHub →

Tech I Work With

Ruby

JavaScript

Python

PostgreSQL

MySQL

Redis

ClickHouse

OpenSearch

AWS

DigitalOcean

Hetzner

Heroku

Rails

Vue.js

Sidekiq

Claude

OpenAI

Gemini

Docker

Cloudflare

GitHub

GitHub Actions

Linux

Recent Posts

I'm Behind and I Don't Care

AI tools change every week. New models, new workflows, new hype. I decided to stop chasing and focus on building instead. Here's why being behind is not a bad thing.

Feb 07, 2026 · 3 min read Read →

aws infrastructure

AWS NAT Gateway cost is killing you? Enable IPv6 and Egress-only Internet Gateway!

Sometimes I feel that AWS is the master of unexpected costs. If you are looking for a quick way to reduce the cost of NAT Gateway, enabling IPv6 and Egress-only Internet Gateway is an easy way to do it.

Jan 09, 2025 · 3 min read Read →

See all posts →