---
title: "React, React Native & AI Case Studies | Callstack"
description: "See how Callstack helps teams build and scale React and React Native products, improve performance, and introduce AI into software delivery."
url: https://www.callstack.com/case-studies
updated: 2026-11-06T10:02:50.932Z
---

# React, React Native & AI Case Studies | Callstack

See how Callstack helps teams build and scale React and React Native products, improve performance, and introduce AI into software delivery.

100+ Enterprise Clients · 7B+ active clients users · $1.8T Clients Revenue

## From startups to Fortune 500.

From React Native migrations to AI-native delivery infrastructure, these are the products, platforms, and engineering systems we helped teams move forward.

### Case studies

- [Building Storybook Connect for JetBrains Twice as Fast With AI](https://www.callstack.com/case-studies/building-storybook-connect-for-jetbrains-in-25-working-days) (Expert Engineering, DevTools): We built a first-class Storybook integration for WebStorm that combines an IDE-native workspace with AI-assisted story generation across React, Vue, and Angular. 2× Estimated AI-assisted delivery speedup · 25 Working days from kickoff to merge · 1 Plugin across three frameworks
- [Accelerating Teamworks' Mobile Delivery With Re.Pack and Module Federation](https://www.callstack.com/case-studies/accelerating-teamworks-mobile-delivery-with-re-pack-and-module-federation) (Expert Engineering, Sports & Entertainment) 10 min from code change to mini-app release
- [Migrating iOS and Android Apps to React Native for AutoZone](https://www.callstack.com/case-studies/migrating-ios-and-android-apps-to-react-native-for-autozone) (Expert Engineering, Automotive) 2x growth in mobile user base during the migration period
- [Cutting Mobile Build Times by Up to 79% for a Southeast Asian Bank](https://www.callstack.com/case-studies/cutting-mobile-build-times-by-up-to-79-for-a-southeast-asian-bank) (Expert Engineering, Finance): We introduced native build reuse and signed delivery for compatible micro-frontends in a Southeast Asian bank’s React Native app with 15M+ registered users, preserving security checks. Full-cache-hit tests cut Android build time by 79% and the measured iOS flow by 58.3%. In an illustrative model of 40,000 annual cache-hit builds split evenly across Android and iOS, the avoided runtime is valued at around US$30,000 using public CI rates. 2.4× faster iOS cache-hit builds on average · 2× faster Android builds with partial reuse · 82% smaller CI installation footprint
- [Migrating Questrade Edge Mobile to a Faster, More Scalable Architecture](https://www.callstack.com/case-studies/migrating-questrade-edge-mobile-to-a-faster-more-scalable-architecture) (Expert Engineering, Finance) 33% fewer re-renders across most features
- [Building Scalable Observability for a High-Growth React Native App](https://www.callstack.com/case-studies/building-scalable-observability-for-a-high-growth-react-native-app) (Agentic Delivery, Finance) 3→1 analytics systems unified into a single interface
- [Building an Agentic SDLC for a Web Launch in Under One Month](https://www.callstack.com/case-studies/building-an-agentic-sdlc-for-a-web-launch-in-under-one-month) (Agentic Delivery, Software Development): We used an agentic SDLC to deliver a production-ready web platform in under one month, with agents executing an estimated 80% of the development effort. 3x estimated delivery acceleration · 80% of dev effort executed by agents · 95+ desktop Lighthouse performance
- [Launching a High-Performance React Native App on Samsung TV](https://www.callstack.com/case-studies/launching-samsung-tv-app-for-global-streaming-platform) (Expert Engineering, Media & Streaming) 5 platforms under one RN codebase: tvOS, FireTV, Tizen, LG, Vizio
- [Improving Chat Performance and Creating a Custom UI Library for Dream11](https://www.callstack.com/case-studies/improving-chat-performance-for-dream11) (Expert Engineering, Sports & Entertainment) 78% bundle size reduction (from 50 MB to 11 MB)
- [Engineering AI Loops for a Cross-Platform Design System](https://www.callstack.com/case-studies/engineering-ai-loops-for-a-cross-platform-design-system) (Expert Engineering, Software Development): We helped an enterprise software team, with an initial rollout spanning 30+ engineers, turn Figma designs into production-ready code faster, with more consistent UI and built-in quality checks across web and mobile. 60+ components mapped with full Code Connect coverage · ~6x faster prototyping for a typical enterprise screen · \<2% visual diff threshold for generated screens
- [Creating React Native SDK Wrapper for Rive](https://www.callstack.com/case-studies/creating-react-native-sdk-wrapper-for-rive) (Expert Engineering, Software Development) 100k weekly downloads on npm
- [Migrating a Legacy React Native App to Expo for Faster Builds and Simplified Releases](https://www.callstack.com/case-studies/migrating-a-legacy-react-native-app-to-expo-for-faster-builds-and-simplified-releases) (Expert Engineering, Retail & E-commerce) 6x faster builds after replacing Jenkins with EAS
- [Enhancing Application's Performance for Expensify](https://www.callstack.com/case-studies/enhancing-applications-performance-for-expensify) (Expert Engineering, Finance): Discover how we revamped the Expensify app for lightning-fast experiences, guided by a systematic DMAIC approach. 5x faster message sending time · 4.5x faster search screen loading time · [Product video](https://www.callstack.com/assets/6970aef55170ec43730a1a9f_expensify-highlighted.webm)
- [Enhancing Performance of Momo's Super App With Re.Pack](https://www.callstack.com/case-studies/improving-performance-of-super-app-for-momo) (Expert Engineering, Finance): MoMo successfully migrated its platform and mini apps to a new architecture using Re.Pack, boosting performance and scalability.
- [Migrating AutoZone’s Storefront to Next.js for Better Performance and SEO](https://www.callstack.com/case-studies/migration-to-nextjs-for-autozone) (Expert Engineering, Automotive) #1 SEO rank, recovering from 3-9
- [Building a browser-based React Native playground for Expo](https://www.callstack.com/case-studies/building-a-browser-based-react-native-playground-for-expo) (Expert Engineering, Software Development): We partnered with Expo to enable instant prototyping, real-device preview, and easy sharing of React Native projects, all without local setup.
- [Training HelloFresh Engineers to Build Production Apps With React Native](https://www.callstack.com/case-studies/training-hellofresh-engineers-to-build-production-apps-with-react-native) (Expert Engineering, Retail & E-commerce) 2.8x increase in knowledge over 8 weeks (25% → 71% assessment scores)
- [Modernizing a Crypto Trading Platform With React Native and Self-Hosted OTA](https://www.callstack.com/case-studies/modernizing-mobile-apps-in-production-with-react-native-and-self-hosted-ota) (Expert Engineering, Finance): We rebuilt the React Native integration and release architecture behind a large crypto trading platform used by millions of people. Native artifacts, a monorepo, fingerprint-based OTA, and AI-assisted workflows gave product teams a controlled way to move more screens to React Native while continuing to ship features. 4x increase in RN pages across the tracked page set · 30% React Native adoption reached during the migration · Millions MAUs covered by the production-ready OTA model
- [Modernizing 7Cup's React Native Codebase and Adding Platform Features](https://www.callstack.com/case-studies/modernizing-react-native-codebase-for-7cup) (Expert Engineering, Healthcare) 130% increase in users post-upgrade
- [Optimizing Android TV Startup for Global Streaming Platform](https://www.callstack.com/case-studies/optimizing-android-tv-startup-for-global-streaming-platform) (Expert Engineering, Media & Streaming) 5% faster startup time on FireTV and FireHD devices
- [React Universe App: Networking Evolved With Liquid Glass](https://www.callstack.com/case-studies/react-universe-app-networking-evolved-with-liquid-glass) (Expert Engineering, Software Development) 63% adoption rate; majority of attendees registered in the app
- [Launching White-Label Super App for Zephyr Cloud With Re.Pack](https://www.callstack.com/case-studies/launching-white-label-super-app-for-zephyrcloud) (Expert Engineering, Software Development): We integrated ZephyrCloud with React Native and developed a white-label application to showcase Zephyr features as well as provide easy getting started story.

From strategy to infrastructure

## Everything you need to ship at AI speed

Build your product with senior React and React Native engineers, or improve delivery with an agentic SDLC.

Expert engineering

### Build and scale React Native apps.

- [Feature Development](https://www.callstack.com/capabilities/feature-development)
- [End-to-End Product Development](https://www.callstack.com/capabilities/end-to-end-product-development)
- [Architecture & Performance](https://www.callstack.com/capabilities/architecture-performance)
- [Enterprise Infrastructure](https://www.callstack.com/capabilities/self-hosted-ci-cd-infrastructure)
- [Team Training](https://www.callstack.com/capabilities/team-training)
- [Migrations & Upgrades](https://www.callstack.com/capabilities/ai-assisted-migrations)
- [Find out more about Expert Engineering](https://www.callstack.com/ai-native-engineering)

Agentic Delivery

### Turn AI into better software delivery.

- [AI SDLC Advisory](https://www.callstack.com/capabilities/ai-sdlc-advisory)
- [AI-Driven QA & Testing](https://www.callstack.com/capabilities/ai-driven-qa-testing)
- [Custom Agents](https://www.callstack.com/capabilities/custom-agents)
- [Custom & Private Models](https://www.callstack.com/capabilities/custom-private-models)
- [Find out more about Agentic Delivery](https://www.callstack.com/agentic-delivery)

Every engagement starts with one conversation. Let's map your situation to the right model.

[Book consultation](https://www.callstack.com/contact)

Clients

## Trusted by enterprise teams at scale.

> Teamworks needed Module Federation, we helped make it real
>
> — Michael Song, Head of Platform / Teamworks

> 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 / Expo

> We had been struggling with React Native application performance until we met Callstack.
>
> — Huỳnh Chí Hùng, Associate Director / MoMo

> I appreciate their attention to detail, flexible approach and a high degree of expertise.
>
> — Glen Moriarty, Founder and CEO / 7cups

> The trainers are always very helpful and supportive. It really makes a difference!
>
> — Artem Musiienko, Staff Eng / Hello Fresh

> I recommend them as a trusted tech partner for running complex projects.
>
> — Jin Chung, Co-Founder, CTO / Rainbow

> Their engineers proved to be a crucial part of our mobile app relaunch project.
>
> — Brian Aznar, Engineering Director / MLS

> The team at Callstack are the most experienced engineers in the React Native community.
>
> — Nader Dabit, Senior Developer Advocate / AWS

> If you're looking for skilled and trusted React Native developers, Callstack is definitely the way to go.
>
> — Tom Occhino, Director of Engineering / Meta

BOOK CONSULTATION

## Ready to scale your product and your delivery?

10+ years of React and React Native expertise, now applied to your agentic SDLC. Senior engineers help you scale your product while keeping quality under control.

- **2×** Estimated AI-assisted delivery speedup (JetBrains) · [Case study](https://www.callstack.com/case-studies/building-storybook-connect-for-jetbrains-in-25-working-days)
- **25** Working days from kickoff to merge (JetBrains) · [Case study](https://www.callstack.com/case-studies/building-storybook-connect-for-jetbrains-in-25-working-days)
- **1** Plugin across three frameworks (JetBrains) · [Case study](https://www.callstack.com/case-studies/building-storybook-connect-for-jetbrains-in-25-working-days)
- **10** min from code change to mini-app release (Teamworks) · [Case study](https://www.callstack.com/case-studies/accelerating-teamworks-mobile-delivery-with-re-pack-and-module-federation)
- **multi-daily** staging deployments instead of weekly releases (Teamworks) · [Case study](https://www.callstack.com/case-studies/accelerating-teamworks-mobile-delivery-with-re-pack-and-module-federation)
- **7** mini-apps supported in one modular mobile platform (Teamworks) · [Case study](https://www.callstack.com/case-studies/accelerating-teamworks-mobile-delivery-with-re-pack-and-module-federation)
- **2** CI/CD lanes for mini-app and host-app distribution (Teamworks) · [Case study](https://www.callstack.com/case-studies/accelerating-teamworks-mobile-delivery-with-re-pack-and-module-federation)
- **2x** growth in mobile user base during the migration period (AutoZone) · [Case study](https://www.callstack.com/case-studies/migrating-ios-and-android-apps-to-react-native-for-autozone)
- **4.2 -\> 4.7** app rating increase after migrating to React Native (AutoZone) · [Case study](https://www.callstack.com/case-studies/migrating-ios-and-android-apps-to-react-native-for-autozone)
- **0** missed releases during the transition to React Native (AutoZone) · [Case study](https://www.callstack.com/case-studies/migrating-ios-and-android-apps-to-react-native-for-autozone)
- **33%** fewer re-renders across most features (Questrade) · [Case study](https://www.callstack.com/case-studies/migrating-questrade-edge-mobile-to-a-faster-more-scalable-architecture)
- **18%** faster time-to-interactive (Questrade) · [Case study](https://www.callstack.com/case-studies/migrating-questrade-edge-mobile-to-a-faster-more-scalable-architecture)
- **-28%** CPU usage in critical trading flows (Questrade) · [Case study](https://www.callstack.com/case-studies/migrating-questrade-edge-mobile-to-a-faster-more-scalable-architecture)
- **78%** bundle size reduction (from 50 MB to 11 MB) (Dream11) · [Case study](https://www.callstack.com/case-studies/improving-chat-performance-for-dream11)
- **30%** faster component mount time after render optimization (Dream11) · [Case study](https://www.callstack.com/case-studies/improving-chat-performance-for-dream11)
- **60%** faster initial load time enabled by switching to Hermes (Dream11) · [Case study](https://www.callstack.com/case-studies/improving-chat-performance-for-dream11)
- **5x** faster message sending time (Expensify) · [Case study](https://www.callstack.com/case-studies/enhancing-applications-performance-for-expensify)
- **4.5x** faster search screen loading time (Expensify) · [Case study](https://www.callstack.com/case-studies/enhancing-applications-performance-for-expensify)
- **#1** SEO rank, recovering from 3-9 (AutoZone) · [Case study](https://www.callstack.com/case-studies/migration-to-nextjs-for-autozone)
- **260kB** less in blocking JS payload (AutoZone) · [Case study](https://www.callstack.com/case-studies/migration-to-nextjs-for-autozone)
- **2–5x** faster feedback loop (AutoZone) · [Case study](https://www.callstack.com/case-studies/migration-to-nextjs-for-autozone)
- **2.8x** increase in knowledge over 8 weeks (25% → 71% assessment scores) (Hello Fresh) · [Case study](https://www.callstack.com/case-studies/training-hellofresh-engineers-to-build-production-apps-with-react-native)
- **15** developers trained across web and native backgrounds (Hello Fresh) · [Case study](https://www.callstack.com/case-studies/training-hellofresh-engineers-to-build-production-apps-with-react-native)
- **86%** of devs self-rated their knowledge as 3/5 or higher after training (up from 0%) (Hello Fresh) · [Case study](https://www.callstack.com/case-studies/training-hellofresh-engineers-to-build-production-apps-with-react-native)
- **130%** increase in users post-upgrade (7cups) · [Case study](https://www.callstack.com/case-studies/modernizing-react-native-codebase-for-7cup)
- **63%** adoption rate; majority of attendees registered in the app (React Universe App) · [Case study](https://www.callstack.com/case-studies/react-universe-app-networking-evolved-with-liquid-glass)
- **67%** of attendees connected through QR badge sharing (React Universe App) · [Case study](https://www.callstack.com/case-studies/react-universe-app-networking-evolved-with-liquid-glass)
- **45%** created personalized badges to showcase identity and goals (React Universe App) · [Case study](https://www.callstack.com/case-studies/react-universe-app-networking-evolved-with-liquid-glass)
- **49%** of attendees onboarded before day one, arriving ready to network (React Universe App) · [Case study](https://www.callstack.com/case-studies/react-universe-app-networking-evolved-with-liquid-glass)

### Book consultation

We’ll connect you with the right expert within 24 hours.