Oskar Kwaśniewski

Oskar Kwaśniewski

Software Developer

React Native Developer at Callstack, currently deepening his knowledge of native development and contributing to open source. Always on the lookout for new and exciting tech to explore. In his free time, he enjoys going to the gym and playing video games.

What I’ve been shipping

Thank you! Your submission has been received!

Oops! Something went wrong while submitting the form.

Article Cover

Exposing SwiftUI Views to React Native: An Integration Guide

Learn how to seamlessly integrate SwiftUI views in React Native and enhance your app’s iOS capabilities with SwiftUI superpowers.

Article Cover

Solving Swift Modular Header Issues in React Native for Good

Learn how to resolve Swift modular header errors in React Native. Explore solutions like static frameworks and a custom CocoaPods plugin.

Article Cover

Simplify Your iOS Brownfield Integration With RootViewFactory

Learn how RootViewFactory streamlines brownfield integration and helps migrate existing iOS apps to React Native efficiently.

Article Cover

Announcing React Native for Apple Vision Pro

Explore the integration of React Native with Apple Vision Pro, enabling immersive experiences beyond compatibility mode.

Article Cover

Experiment With the New Architecture of React Native

Learn how experimenting with the New Architecture of React Naive can future-proof your app and boost its performance.

Article Cover

Migrating a React Native Library to the New Architecture

Want to learn more about migrating React Native libraries to the New Architecture? Our article provides an overview of the migration steps.

Article Cover

Setting up React Native Monorepo With Yarn Workspaces

Why you should create a React Native monorepo and how to do it.

Podcast Cover

You Don’t Need a Rewrite, You Need React Native Brownfield

Discover how modern React Native Brownfield integration enables cross-platform power in native apps, without rewriting from scratch.

Podcast Cover

Stepping Into New Dimension With React Native VisionOS

Try immersing yourself in the React Universe with React Native visionOS! Listen about the latest changes in the framework & watch a 3D app demo.

Podcast Cover

State of React Native

In this Coffee Talk Michał Pierzchała, Oskar Kwaśniewski, and Łukasz Chludziński comment on the results of the State of React Native survey. Check it out!

Podcast Cover

React Native for Apple Vision Pro and visionOS

In this episode, Łukasz invites Oskar and Michał to discuss their experimental journey of bringing React Native to Apple Vision Pro and visionOS.

Event Cover

Native Apps Without a Build Step

Discover Rock by Callstack: the open, modular, self-hosted framework for React Native. Built to help teams scale, migrate, and deliver faster in the evolving React Native ecosystem.

Event Cover

Tips & Tricks From The Ultimate Guide to React Native Optimization 2025

View flattening, React 19 hooks, real DevTools tips-learn what actually helps your React Native app run faster.

Event Cover

How to Make Your React (Native) App Feel Native

How to make your React Native app feel truly native, across iOS, Android, tvOS & more. Dive into best practices, navigation, and react-native-bottom-tabs.

Event Cover

React Universe Meetup: San Francisco

Missed the React Universe Meetup SF? Watch the livestream recording soon, talks on RN performance, optimization, and build-free workflows await.

Event Cover

React Native ❤️ Apple Vision Pro

In this talk, Oskar talks about bringing React Native to Vision Pro and building VR apps with React

Event Cover

React Native WebAssembly Release Walkthrough

Join us for a deep dive into Polygen: Callstack Incubator's breakthrough in React Native development!

Event Cover

New React Native Framework for Enterprise Announcement

We know what it takes to make React Native work for serious-scale applications. That’s why we created Rock, so enterprise teams can build with confidence, efficiency, and full control over their stack.

Event Cover

Building React Universe Conf App With Replit

Mike and Oskar tried both Repl.it and Bolt.new to code a new conference app, and after burning millions of tokens, they fell back to Cursor.

//

Join us

Join the team building the React Universe

We’re a team of trusted React and React Native contributors who care deeply about great code, Open Source, and solving real-world problems together.