Callstack Engineers
We specialize in developing cross-platform, full-stack apps with React and React Native at their core - a combination we call React Universe that lets you enjoy better and faster apps, multiple platforms development, smoother running teams, and lower operational costs.
As official React Native partners, we work hand-in-hand with Meta, Microsoft, Expo, just to name a few, to drive the evolution of this technology. Our team actively contributes to the React Native ecosystem by creating proposals, suggesting improvements, and maintaining key components - which means that your React Native product will always be at the forefront of innovation.
You’ll find there video content related to everything we do at Callstack: from React Universe On Air podcast episodes and React Unive Conf livestreams, through webinar recordings and tutorials to help you solve specific React and React Native development-related problems, to show reels that allow you to get to know us better.
Callstack Engineers
Many performance issues start (and stay hidden) at the JavaScript layer—until they impact user experience and retention.
If you missed it, we recently published the recording of Master JavaScript Performance in React Native (Part 1), where Mike Grabowski and Szymon Chmal walk through lessons you can apply immediately:
🔍 How to use the right tools to identify true JavaScript and React bottlenecks
🔍 Why incorrect usage of Context API leads to unnecessary re-renders, and how to fix it with smart memoization
🔍 How synchronous work can block the JS thread, and how to avoid it
Catch up on the full webinar recording!
12 hours ago | [YT] | 0
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Callstack Engineers
Integrating React Native into your native apps just got a lot easier. Meet React Native Brownfield, our library that lets you load RN components as SwiftUI, UIKit, Jetpack Compose, Android views, and more. Read Burak's article about it ➡️ bit.ly/4cPUWIJ
1 day ago | [YT] | 9
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Callstack Engineers
Your team’s working hard. But is JS performance silently holding back your app? This session will show you how to fix it—quickly and cleanly. Learn more and reserve a seat 🙌 streamyard.com/watch/pnM9CYNz633z
If you haven’t already, grab your copy of Callstack’s Ultimate Guide, where we show how to optimize all aspects of your React Native app, not only the JavaScript side 📖 bit.ly/3Go7tH3
4 days ago | [YT] | 7
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Callstack Engineers
Part 1 of our JavaScript optimization webinar set the stage. Now, in Part 2, we’re going deeper—into the kind of performance problems (and opportunities) that are easy to miss but critical to solve, such as:
➡️ Component thrashing or missing memoization where it’s absolutely critical
➡️ Placing state variables or Redux selectors in the wrong spot
➡️ New capabilities introduced by Concurrent React
Join Callstack’s Mike Grabowski and Szymon Chmal to learn how to spot and eliminate subtle JS bottlenecks. Sign up 📆 streamyard.com/watch/pnM9CYNz633z
6 days ago | [YT] | 13
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Callstack Engineers
This isn’t your average React Native performance talk. It’s a live, hands-on walkthrough of how to improve JS performance in real apps.
Sign up to learn how to spot bottlenecks & improve FPS—and get to ask questions directly to the folks who built our performance guide 🙌 streamyard.com/watch/VW8Ufyt3dbk7
And if you haven’t already, grab your copy of the Ultimate Guide to React Native Optimization here 📖 bit.ly/42AfyAY
2 weeks ago | [YT] | 5
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Callstack Engineers
How do you actually improve JS performance in React Native? Join us for a live walkthrough & Q&A of our optimization guide ➡️ streamyard.com/watch/VW8Ufyt3dbk7
🟣 What’s hurting your FPS
🟣 Real profiling techniques
🟣 How to find memory leaks
🎙️ Hosted by Mike Grabowski and Szymon Chmal
📅 Apr 15, 5pm CET
3 weeks ago | [YT] | 20
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Callstack Engineers
Quick update before the weekend. React Universe Meetup is coming to the Bay Area again! 🌉
We're teaming up with Expensify to bring you what’s next in React and React Native:
→ Updates on the React Native Enterprise Framework from Michał Pierzchała, Principal Engineer at Callstack
→ User-Focused Performance Tracking by Tim Golen, Director of Engineering at Expensify
→ Special announcements from Mike Grabowski and Callstack
📅 Thursday, April 24 | 5:30–9:00 PM PDT
📍 Expensify HQ, San Francisco
🎟️ Join us in person and online: bit.ly/4laBZE3
3 weeks ago | [YT] | 7
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Callstack Engineers
First React Universe Conf 2025 workshop just dropped!
👉 "React Native Performance" is for experienced React Native devs ready to go native-modules deep.
You’ll master:
🔹 DMAIC methodology
🔹 React performance techniques
🔹 Advanced debugging & profiling (JS & Native)
🔹 JS–Native communication
🔹 Deep profiling in Xcode & Android Studio
🔹 Native debugging strategies
🔹 Common performance pitfalls
🔹 Optimizing components & memoization
Book your spot → hubs.li/Q03fgsFX0
4 weeks ago | [YT] | 7
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Callstack Engineers
Brownfield React Native: a smarter way to go cross-platform ✨
In this session, Mike Grabowski and Burak Guner share how teams can integrate React Native into native apps without rewriting, disrupting workflows, or sacrificing performance.
If you’re looking to reduce duplicated effort or accelerate delivery cycles, this talk lays out proven approaches from the teams who’ve done it.
4 weeks ago | [YT] | 1
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Callstack Engineers
React Native Enterprise Framework.
In this webinar, we’ll show you how the React Native Enterprise Framework can help enterprise teams gain a smarter, cleaner approach to building robust apps.
What you’ll learn:
✅ What idea stands behind the New React Native Framework for Enterprise
✅ Which features are already cooked, and what is coming soon
✅ What is the current update on the project
Register now 📺 streamyard.com/watch/hvfWWiWy5ZUy
1 month ago | [YT] | 9
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