Software Engineer

Hey 👋, I'm Rafał! I'm a software engineer passionate about building great products and solving challenging technical problems.

Recent Posts

• LLM Token Context Windows and the Attention Architecture

  Posted on:May 9, 2026

  A deep dive into how LLMs manage context through attention mechanisms, and the engineering tricks that push context windows past their quadratic limits.

  llmtransformersattention

• SwiftUI Under the Hood: Its Architecture and Relationship to UIKit

  Posted on:May 8, 2026

  SwiftUI is not a black box replacement for UIKit. It's a view graph diffing engine that runs on top of UIKit and AppKit. Here's how it actually works.

  swiftuiiosuikit

• Understanding Copy-on-Write in Swift

  Posted on:May 7, 2026

  Swift's value types avoid expensive copies until you actually mutate them. Here's how CoW works under the hood.

  swiftios

• How Does an LLM Know It's Done?

  Posted on:May 6, 2026

  LLMs don't 'feel' done. They stop because the math tells them to. Here's how.

  llm

• Best Practices for Unit Testing iOS Apps

  Posted on:October 20, 2022

  Tests are automated. Run often. Preferably on each commit or pull request to quickly catch regressions.

  ios

• Reference Cycles in iOS

  Posted on:September 20, 2022

  Strong reference cycles prevent instances from ever being deallocated, causing a memory leak.

  ios

• Concurrency and Parallelism in iOS

  Posted on:September 19, 2022

  iOS offers several ways to run tasks concurrently. This article is a short summary of them.

  ios

• Low Memory Crash Events in iOS

  Posted on:January 10, 2016

  How crash reporting tools work.

  ios

• Coordinate System in SpriteKit

  Posted on:November 10, 2015

  Differences between SKScene and SKNode when it comes to coordinate system in SpriteKit.

  iosspritekit

• Advertising Identifier in iOS

  Posted on:August 10, 2015

  An alphanumeric string unique to each device, used only for serving advertisements.

  ios