--- 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: 2026-11-13T08:06:58.029Z --- # 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 - [26% Shorter Release Cycles for a Mobile Banking App](https://www.callstack.com/case-studies/shorter-mobile-banking-release-cycles) (Expert Engineering, Finance): We unified the bank’s React Native codebase and improved CI/CD, automated testing, and diagnostics to address integration issues that were delaying mobile releases. The time from feature completion to release readiness fell from 19 to 14 days. Feature teams gained earlier feedback, while the Platform Team took greater ownership of delivery. 26% less time preparing releases · 30 minutes to make a fix testable · 45 automated integration checks - [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 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 - [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 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 - [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 - [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. - [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) - [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 - [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. - **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) - **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) - **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) - **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) - **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) - **#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) - **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) - **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) ### Book consultation We’ll connect you with the right expert within 24 hours.