Callstack | Expert React & React Native Development Services

Callstack | Expert React & React Native Development Services | Meta Partners

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Contributing since 2016

Callstack was founded a few months after React Native was released to support developers and companies looking to use it, without having to worry about the complexity of building native apps.

Since then, we’ve helped teams of all sizes succeed with React Native, while contributing to the core framework and maintaining key open source tools.

Mike Grabowski

Founder & React Native Core Contributor

When your team needs direction,  we bring clarity

Work with expert React and React Native developers to solve challenges, ship faster, and scale with confidence, on every platform.

Consulting

Get expert support all things React

Get expert help from Core Contributors with 9+ years of experience in React and React Native, whether you’re solving a specific issue or planning architecture that scales.

Product Development

Launch faster on all platforms

Build your product once for 10+ platforms, from iOS and Android to tvOS, Vision Pro, and beyond; saving time, reducing development costs, and maximizing reach.

Enterprise Solutions

Scale React at your organization

Adopt React Native at scale with the right architecture, shared codebase, and built-in monitoring; designed to support complex teams and long-term growth.

AI Engineering

Ship production-ready AI cross-platform

Build reliable AI features from on-device models to knowledge-connected assistants, designed to scale in real products.

We've delivered solutions to over 300 teams at 100+ enterprise clients worldwide

Contributing since 2016

We are proud members of React community

If you're looking for skilled and trusted React Native developers, Callstack is definitely the way to go.

The team at Callstack are the most experienced engineers in the React Native community.

Nader Dabit

Senior Developer Advocate

AWS

Their ability to deliver, and follow through, is unparalleled in the React Native ecosystem.

Matt Hargett

Principal Software Engineer

Roblox

20mln+

Downloads on npm

10k+

Stars on GitHub

250

Commits to React Native

Our libraries are used by millions of developers worldwide

If you're creating an app with React or React Native, there's a good chance our code is already running in your application.

We build apps in the React Universe

Instead of splitting development across multiple languages, platforms, and teams, we combine front and back-end development with cross-platform capabilities using a single programming model.

We solve all React Native challenges, from brownfield to greenfield

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React Universe App: Networking Evolved with Liquid Glass

63%

adoption rate; majority of attendees registered in the app

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React Native Performance Optimization

Migrating Questrade Edge Mobile to a Faster, More Scalable Architecture

33%

fewer re-renders across most features

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New Architecture Migration

Migrating a Legacy React Native App to Expo for Faster Builds and Simplified Releases

faster builds after replacing Jenkins with EAS

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React Native Performance Optimization

Monitoring & Observability

Building Scalable Observability for a High-Growth React Native App

3→1

analytics systems unified into a single interface

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Migration to React Native

Training HelloFresh Engineers to Build Production Apps With React Native

2.8x

increase in knowledge over 8 weeks (25% → 71% assessment scores)

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Building a browser-based React Native playground for Expo

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Migration to React Native

Migrating iOS and Android Apps to React Native for AutoZone

growth in mobile user base during the migration period

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Streaming App Development

React Native Performance Optimization

Optimizing Android TV Startup for Global Streaming Platform

faster startup time on FireTV and FireHD devices

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Streaming App Development

Launching a High-Performance React Native App on Samsung TV

platforms under one RN codebase: tvOS, FireTV, Tizen, LG, Vizio

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Migrating AutoZone’s Storefront to Next.js for Better Performance and SEO

SEO rank, recovering from 3-9

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React Native Performance Optimization

Enhancing Application's Performance for Expensify

faster message sending time

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React Native Performance Optimization

Improving Chat Performance and Creating a Custom UI Library for Dream11

78%

bundle size reduction (from 50 MB to 11 MB)

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React Native Modules Development

Creating React Native SDK Wrapper for Rive

100k

weekly downloads on npm

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Module Federation Development

Enhancing Performance of Momo's Super App With Re.Pack

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Modernizing 7Cup's React Native Codebase and Adding Platform Features

130%

increase in users post-upgrade

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Launching White-Label Super App for Zephyr Cloud With Re.Pack

Your cross-platform knowledge hub

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React Native Wrapped 2025: A Month-by-Month Recap of The Year

The first edition of React Native Wrapped looks back at the year RN turned 10 and the ecosystem doubled down on the New Architecture. It provides a month-by-month record of 2025, covering major framework releases, the Legacy Architecture freeze, React 19 integration, and notable developments across tooling, performance, styling, native modules, Expo, and platform adoption.

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From Teddy Bears to Voice Agents: Kraen Hansen on Voice AI, Local-First & App Security

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Agent Conf

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