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React Foundation

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Trusted by 100+ Enterprise clients

Expert Engineering

Build and scale React Native apps.

For over a decade, enterprise teams have trusted us with React and React Native products. Our senior engineers work with AI agents on new builds, complex migrations, and native engineering.

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From redesigning development workflows to building custom agents, testing their output, and choosing the right models, we turn AI into a practical part of product delivery.

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From Startups to Fortune 500.

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React Foundation
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300+ commits to React Native
Contributing since 2016
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50M+
OSS downloads per month
100+
Enterprise clients
67K+
GitHub stars
Teamworks needed Module Federation, we helped make it real
Michael Song
Michael Song
Head of Platform
The trainers are always very helpful and supportive. It really makes a difference!
Artem Musiienko
Artem Musiienko
Staff Eng
If you're looking for skilled and trusted React Native developers, Callstack is definitely the way to go.
Tom Occhino
Tom Occhino
Director of Engineering
Not only does Callstack have tremendously talented engineers, but I know they care about the success of the project as much as I do.
TC Davis
TC Davis
Product
The team at Callstack are the most experienced engineers in the React Native community.
Nader Dabit
Nader Dabit
Senior Developer Advocate
Their ability to deliver, and follow through, is unparalleled in the React Native ecosystem.
Matt Hargett
Matt Hargett
Principal Software Engineer
I recommend them as a trusted tech partner for running complex projects.
Jin Chung
Jin Chung
Co-Founder, CTO
Their engineers proved to be a crucial part of our mobile app relaunch project.
Brian Aznar
Brian Aznar
Engineering Director
We had been struggling with React Native application performance until we met Callstack.
Huỳnh Chí Hùng
Huỳnh Chí Hùng
Associate Director
I appreciate their attention to detail, flexible approach and a high degree of expertise.
Glen Moriarty
Glen Moriarty
Founder and CEO
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Case studies

See what experts and agents ship together.

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Enterprise Infrastructure

Cutting Mobile Build Times by Up to 79% for a Southeast Asian Bank

2.4×

faster iOS cache-hit builds on average

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End-to-End Product Development

Building Storybook Connect for JetBrains Twice as Fast With AI

2×

Estimated AI-assisted delivery speedup

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Migrations & Upgrades
Architecture & Performance

Modernizing a Crypto Trading Platform With React Native and Self-Hosted OTA

4x

increase in RN pages across the tracked page set

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Custom Agents
AI-Driven QA & Testing
Architecture & Performance

Building an Agentic SDLC for a Web Launch in Under One Month

3x

estimated delivery acceleration

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AI-Driven QA & Testing

Engineering AI Loops for a Cross-Platform Design System

60+

components mapped with full Code Connect coverage

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End-to-End Product Development
Enterprise Infrastructure

Accelerating Teamworks' Mobile Delivery With Re.Pack and Module Federation

10

min from code change to mini-app release

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End-to-End Product Development
Feature Development

React Universe App: Networking Evolved With Liquid Glass

63%

adoption rate; majority of attendees registered in the app

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Architecture & Performance
Migrations & Upgrades
AI-Driven QA & Testing

Migrating Questrade Edge Mobile to a Faster, More Scalable Architecture

33%

fewer re-renders across most features

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Migrations & Upgrades
Enterprise Infrastructure

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

6x

faster builds after replacing Jenkins with EAS

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Enterprise Infrastructure
Architecture & Performance

Building Scalable Observability for a High-Growth React Native App

3→1

analytics systems unified into a single interface

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Team Training
Migrations & Upgrades
Architecture & Performance

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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Feature Development
End-to-End Product Development

Building a browser-based React Native playground for Expo

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Migrations & Upgrades
End-to-End Product Development
Enterprise Infrastructure

Migrating iOS and Android Apps to React Native for AutoZone

2x

growth in mobile user base during the migration period

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Architecture & Performance
End-to-End Product Development

Optimizing Android TV Startup for Global Streaming Platform

5%

faster startup time on FireTV and FireHD devices

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End-to-End Product Development
Enterprise Infrastructure
Architecture & Performance

Launching a High-Performance React Native App on Samsung TV

5

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

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Feature Development
Architecture & Performance

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

#1

SEO rank, recovering from 3-9

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Architecture & Performance
AI-Driven QA & Testing
Enterprise Infrastructure

Enhancing Application's Performance for Expensify

5x

faster message sending time

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Architecture & Performance
End-to-End Product Development

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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Architecture & Performance
Feature Development

Creating React Native SDK Wrapper for Rive

100k

weekly downloads on npm

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End-to-End Product Development
Feature Development
Team Training

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

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Migrations & Upgrades
Feature Development
End-to-End Product Development

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

130%

increase in users post-upgrade

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End-to-End Product Development
Feature Development

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

Clients

Trusted by enterprise teams at scale.

The trainers are always very helpful and supportive. It really makes a difference!

Artem Musiienko

Staff Eng

I recommend them as a trusted tech partner for running complex projects.

Jin Chung

Co-Founder, CTO

Their engineers proved to be a crucial part of our mobile app relaunch project.

Brian Aznar

Engineering Director

I appreciate their attention to detail, flexible approach and a high degree of expertise.

Glen Moriarty

Founder and CEO

Not only does Callstack have tremendously talented engineers, but I know they care about the success of the project as much as I do.

TC Davis

Product

Teamworks needed Module Federation, we helped make it real

Michael Song

Head of Platform

We had been struggling with React Native application performance until we met Callstack.

Huỳnh Chí Hùng

Associate Director

EXPERT ENGINEERING · AGENTIC DELIVERY

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Our engineers can join your team, take on a defined project, or help you adopt agents across development, testing, and release. Tell us what you're working on.

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Insights

Worth your time, by engineers.

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Article
10/16/2026

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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Event
11/17/2026

Efficient On-Device LLMs in React Native Done Right

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Podcast
10/13/2026

MCP and Supervisor Agents in eBay's Monitoring Workflow With Leonel Candido da Silva

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Webinar
7/21/2026

Behavior Review for AI-Native Delivery

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Article
10/30/2026

How AI Agents Can Cut Manual QA by 30%

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