Oskar Kwaśniewski

Oskar Kwaśniewski

Senior Software Engineer

Building React Native apps at Callstack. Open source enthusiast with 100+ merged PRs to React Native Core.

Focused on native development in Swift, Objective-C, Java and Kotlin. In my free time I enjoy gravel cycling and learning new things.

Projects

Expo iCloud Storage

React Native wrapper for iCloud's NSUbiquitousKeyValueStore.

Liquid Glass

iOS 26 liquid glass effect for React Native.

MiniSim

MacOS menu bar app for launching iOS and Android 🤖 emulators.

React Native Bottom Tabs

Native bottom tabs for React Native, using platform primitives.

React Native Emoji Popup

Native emoji picker popup for React Native.

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Writing

Paper First, Digital Archive: Why I Built NoteScan

Bridging analog notes and digital systems

2026-01-15

Copying a Git repository with full commit history

How to copy full git history to new repo

2025-10-17

Xcode UI debugging with Quick Look

Preview variables right from your editor

2024-08-05

iPad Hover effects in React Native 0.74

New feature, that you probably missed

2024-05-08

Building multi-window applications with React Native visionOS

Working with multiple windows

2024-03-22
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