Case studies

Challenges we solved so far

Take a look at the projects we did for enterprises and small businesses.  We can help your company grow as well.

ALL

Enterprise SolutionsProduct Developmentconsulting

Services

Generative AI App Development

AI Vibe Coding Cleanup

AI Knowledge Integration

On-device AI

New Architecture Migration

Quality Assurance

Scalability Engineering

Code Sharing

Monitoring & Observability

Migration to React Native

Release Process Optimization

Super App Development

VR App Development

Desktop App Development

React Native Brownfield

Streaming App Development

Web App Development

Mobile App Development

React Native Development

Next.js Development

React Development

Module Federation Development

React Compiler Implementation

React Native Trainings

React Native Modules Development

Expo Development

React Native Upgrades

React Native Performance Optimization

Clear all

Apply

Thank you! Your submission has been received!

Oops! Something went wrong while submitting the form.

Product Development

Module Federation Development

React Universe App: Networking Evolved with Liquid Glass

63%

adoption rate; majority of attendees registered in the app

A great developer conference is equally about talks and schedules as it is about connecting with people. For our flagship React Universe Conf, Callstack set out to create a digital companion app that went beyond the agenda and made networking effortless.

View project

Product Development

Mobile App Development

Module Federation Development

React Universe App: Networking Evolved with Liquid Glass

63%

adoption rate; majority of attendees registered in the app

View project

Consulting

New Architecture Migration

Quality Assurance

Migrating Questrade Edge Mobile to a Faster, More Scalable Architecture

33%

fewer re-renders across most features

Optimized a high-volume trading app’s startup time, responsiveness, and rendering under heavy data load, while preparing it for React Native’s New Architecture to deliver faster, smoother performance in critical user flows.

View project

Consulting

New Architecture Migration

Quality Assurance

Migrating Questrade Edge Mobile to a Faster, More Scalable Architecture

33%

fewer re-renders across most features

View project

Product Development

Migration to React Native

Code Sharing

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

faster builds after replacing Jenkins with EAS

We helped a client migrate a legacy React Native app to Expo, replacing slow Jenkins builds with fast, reliable EAS builds and simplifying their release process.

View project

Product Development

Migration to React Native

Code Sharing

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

faster builds after replacing Jenkins with EAS

We helped a client migrate a legacy React Native app to Expo, replacing slow Jenkins builds with fast, reliable EAS builds and simplifying their release process.

View project

Enterprise Solutions

Migration to React Native

React Native Performance Optimization

Building Scalable Observability for a High-Growth React Native App

3→1

analytics systems unified into a single interface

By introducing custom performance tracking and stabilizing their test infrastructure, we helped the client detect incidents faster, improve release quality, and enable reliable performance insights across their React Native mobile app.

View project

Enterprise Solutions

Migration to React Native

React Native Performance Optimization

Building Scalable Observability for a High-Growth React Native App

3→1

analytics systems unified into a single interface

View project

Enterprise Solutions

Migration to React Native

New Architecture Migration

Training HelloFresh Engineers to Build Production Apps With React Native

2.8x

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

We delivered a practical, real-world React Native training program tailored to the client’s internal architecture. In eight weeks, 15 developers were trained to work in a shared mobile codebase.

View project

Enterprise Solutions

Migration to React Native

New Architecture Migration

Training HelloFresh Engineers to Build Production Apps With React Native

2.8x

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

We delivered a practical, real-world React Native training program tailored to the client’s internal architecture. In eight weeks, 15 developers were trained to work in a shared mobile codebase.

View project

Product Development

Mobile App Development

Next.js Development

Building a browser-based React Native playground for Expo

We partnered with Expo to enable instant prototyping, real-device preview, and easy sharing of React Native projects, all without local setup.

View project

Product Development

Mobile App Development

Next.js Development

Building a browser-based React Native playground for Expo

We partnered with Expo to enable instant prototyping, real-device preview, and easy sharing of React Native projects, all without local setup.

View project

Consulting

Mobile App Development

Migration to React Native

Migrating iOS and Android Apps to React Native for AutoZone

growth in mobile user base during the migration period

AutoZone partnered with Callstack to replace its aging native apps with a single cross-platform codebase, keeping its biweekly release cycle while migrating core app functionality to React Native.

View project

Consulting

Mobile App Development

Migration to React Native

Migrating iOS and Android Apps to React Native for AutoZone

growth in mobile user base during the migration period

AutoZone partnered with Callstack to replace its aging native apps with a single cross-platform codebase, keeping its biweekly release cycle while migrating core app functionality to React Native.

View project

Enterprise Solutions

Streaming App Development

React Native Performance Optimization

Optimizing Android TV Startup for Global Streaming Platform

faster startup time on FireTV and FireHD devices

We identified a performance bottleneck in an enterprise streaming app and introduced a simple change that improved startup time by up to 5% on Android-based platforms, without any major refactoring.

View project

Enterprise Solutions

Streaming App Development

React Native Performance Optimization

Optimizing Android TV Startup for Global Streaming Platform

faster startup time on FireTV and FireHD devices

We identified a performance bottleneck in an enterprise streaming app and introduced a simple change that improved startup time by up to 5% on Android-based platforms, without any major refactoring.

View project

Product Development

Module Federation Development

Expo Development

Launching a High-Performance React Native App on Samsung TV

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

Rebuilding the legacy Samsung TV app in React Native restored feature parity, improved performance, and aligned it with the client’s shared TV codebase, without growing the team.

View project

Product Development

Module Federation Development

Expo Development

Launching a High-Performance React Native App on Samsung TV

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

Rebuilding the legacy Samsung TV app in React Native restored feature parity, improved performance, and aligned it with the client’s shared TV codebase, without growing the team.

View project

Consulting

Scalability Engineering

Code Sharing

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

SEO rank, recovering from 3-9

AutoZone replaced a custom SSR setup with Next.js, improving web performance and recovering lost SEO rankings.

View project

Consulting

Scalability Engineering

Code Sharing

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

SEO rank, recovering from 3-9

AutoZone replaced a custom SSR setup with Next.js, improving web performance and recovering lost SEO rankings.

View project

Enterprise Solutions

React Native Performance Optimization

React Native Modules Development

Enhancing Application's Performance for Expensify

faster message sending time

Discover how we revamped the Expensify app for lightning-fast experiences, guided by a systematic DMAIC approach.

View project

Enterprise Solutions

React Native Performance Optimization

React Native Modules Development

Enhancing Application's Performance for Expensify

faster message sending time

Discover how we revamped the Expensify app for lightning-fast experiences, guided by a systematic DMAIC approach.

View project

Product Development

Super App Development

Mobile App Development

Improving Chat Performance and Creating a Custom UI Library for Dream11

78%

bundle size reduction (from 50 MB to 11 MB)

We enhanced the performance of the Dream11 platform by optimizing chat functionality for low- and medium-end devices, and creating a custom UI component library.

View project

Product Development

Super App Development

Mobile App Development

Improving Chat Performance and Creating a Custom UI Library for Dream11

78%

bundle size reduction (from 50 MB to 11 MB)

We enhanced the performance of the Dream11 platform by optimizing chat functionality for low- and medium-end devices, and creating a custom UI component library.

View project

Consulting

React Native Development

React Native Upgrades

Creating React Native SDK Wrapper for Rive

100k

weekly downloads on npm

We helped Rive, an interactive design tool, reach a broader audience by creating a React Native library that integrates its SDK for iOS and Android.

View project

Consulting

React Native Development

React Native Upgrades

Creating React Native SDK Wrapper for Rive

100k

weekly downloads on npm

We helped Rive, an interactive design tool, reach a broader audience by creating a React Native library that integrates its SDK for iOS and Android.

View project

Consulting

React Native Performance Optimization

React Native Development

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

MoMo successfully migrated its platform and mini apps to a new architecture using Re.Pack, boosting performance and scalability.

View project

Consulting

React Native Performance Optimization

React Native Development

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

MoMo successfully migrated its platform and mini apps to a new architecture using Re.Pack, boosting performance and scalability.

View project

Product Development

Code Sharing

React Native Development

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

130%

increase in users post-upgrade

We rewrote the 7 Cups mobile app, taking over the project from another developer team.

View project

Product Development

Code Sharing

React Native Development

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

130%

increase in users post-upgrade

We rewrote the 7 Cups mobile app, taking over the project from another developer team.

View project

Enterprise Solutions

Mobile App Development

Next.js Development

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

We integrated ZephyrCloud with React Native and developed a white-label application to showcase Zephyr features as well as provide easy getting started story.

View project

Enterprise Solutions

Mobile App Development

Next.js Development

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

We integrated ZephyrCloud with React Native and developed a white-label application to showcase Zephyr features as well as provide easy getting started story.

View project

Sorry, nothing to see here...

Try different filters or just safely check all.

See All

Valued by clients worldwide

How we can help your team move faster

Whether you need help solving a complex issue or building a product across platforms, we’ve got the expertise to step in.

Consulting

Get expert help from core contributors with 9+ years of experience in React and React Native.

Find out more

Product Development

Build your product once for 10+ platforms, from iOS and Android to tvOS, Vision Pro, and beyond.

Find out more

Enterprise Solutions

Adopt React Native at scale with the architecture designed to support complex teams and long-term growth.

Find out more

Consulting

Get expert help from core contributors with 9+ years of experience in React and React Native.

Build better apps

Product Development

Build your product once for 10+ platforms, from iOS and Android to tvOS, Vision Pro, and beyond.

Ship faster

Enterprise Solutions

Adopt React Native at scale with the architecture designed to support complex teams and long-term growth.

Scale smarter