--- title: "Expert Engineering for React & React Native | Callstack" description: "Build and scale React and React Native products with expert engineers and AI-native workflows for development, migrations, performance, and infrastructure." url: https://www.callstack.com/ai-native-engineering updated: 2026-11-06T10:06:29.198Z --- # Expert Engineering for React & React Native | Callstack Build and scale React and React Native products with expert engineers and AI-native workflows for development, migrations, performance, and infrastructure. 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. [Book a call](https://www.callstack.com/contact) · [Explore services](#lanes) Trusted by 100+ Enterprise clients Expensify · Ticketmaster · DirecTV · MLS · PWC · Evernote · AutoZone · MoMo · Dream11 · Rainbow · Futurewei · RIMAC · Hello Fresh · Haaretz · ForaTravel · CelcomDigi · Teamworks · Boats · Questrade · Dialogue ### [Ship priority features with React and React Native experts.](https://www.callstack.com/capabilities/feature-development) Feature Development Senior product engineers join your team to clear backlog, ship roadmap work, and take high-impact implementation off your internal leads. AI-native delivery lets a small expert team cover more ground without lowering your bar for review, testing, or architecture. - [React Native Development](https://www.callstack.com/services/react-native-development) - [React Development](https://www.callstack.com/services/react-development) - [Next.js Development](https://www.callstack.com/services/next-js-development) ### [Ship every platform from one codebase.](https://www.callstack.com/capabilities/end-to-end-product-development) End-to-End Product Development We take full ownership of your product, from architecture to release. One senior AI-native team builds and ships it end to end, so you get to market faster with less delivery complexity. - [Super App Development](https://www.callstack.com/services/super-app-development) - [Mobile App Development](https://www.callstack.com/services/mobile-app-development) - [Web App Development](https://www.callstack.com/services/web-app-development) ### [Solve your hardest engineering challenges.](https://www.callstack.com/capabilities/architecture-performance) Architecture & Performance We help products get past technical limits that slow delivery and hurt quality. Senior engineers solve the underlying issues so teams can ship faster with more confidence. - [React Native Performance Optimization](https://www.callstack.com/services/react-native-performance-optimization) - [AI Vibe Coding Cleanup](https://www.callstack.com/services/ai-vibe-coding-cleanup) - [React Native Modules Development](https://www.callstack.com/services/react-native-modules-development) ### [Build a stronger platform for React Native delivery.](https://www.callstack.com/capabilities/self-hosted-ci-cd-infrastructure) Enterprise Infrastructure We work alongside platform teams to remove bottlenecks across React Native builds, testing, releases, and monitoring. The result is faster feedback, safer releases, and infrastructure the organization can operate and evolve. - [Release Automation](https://www.callstack.com/services/release-process-optimization) - [CI/CD Modernization](https://www.callstack.com/services/ci-cd-modernization) - [Build & Test Acceleration](https://www.callstack.com/services/build-test-acceleration) ### [Build stronger engineering teams.](https://www.callstack.com/capabilities/team-training) Team Training We run targeted, hands-on training around your codebase, engineering goals, and delivery constraints. Programs cover React and React Native fundamentals, architecture, performance, production patterns, and AI-assisted workflows. - [AI Developer Training](https://www.callstack.com/services/ai-developer-training) - [React Native Trainings](https://www.callstack.com/services/react-native-trainings) ### [Execute complex migrations fast and with confidence.](https://www.callstack.com/capabilities/ai-assisted-migrations) Migrations & Upgrades We move your product off legacy systems onto a stronger, more secure foundation. Expert engineers and AI-assisted workflows help you execute complex migrations faster and with confidence. - [Migration to React Native](https://www.callstack.com/services/migration-to-react-native) - [Migration to Self-Hosted Infrastructure](https://www.callstack.com/services/migration-to-self-hosted-infrastructure) - [Migration to Modular Architecture](https://www.callstack.com/services/migration-to-modular-architecture) Expert engineering ## Bring us your engineering challenge. 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. [Book consultation](https://www.callstack.com/contact) How we work together ## Engineering support that fits your team. ### Extend your team Our senior engineers join your team to ship features, guide technical decisions, and strengthen delivery. - Your roadmap and workflow - Expertise shared as we work - Flexible timezone coverage ### Deliver a project We take agreed work from technical planning to release, with clear responsibilities and progress you can see. - 3 Callstack engineers ship like 6 - Impact visible before sprint two - End-to-end delivery ### Solve specific challenge We address a performance, migration, or infrastructure challenge, or run training around your team’s needs. - Focused reviews or implementation - Knowledge your team keeps - Outcomes guaranteed with contract - React Foundation Founding Member · 300+ commits to React Native · Contributing since 2016 - 100+ Enterprise projects delivered - Industry runs on our tooling · 50M+ OSS downloads / month - [3.7× Lower task cost vs Opus 5.5](https://apex.callstack.com) - “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 / Major League Soccer · “I appreciate their attention to detail, flexible approach and a high degree of expertise.” — Glen Moriarty, Founder and CEO / 7 Cups · “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 - [5x Faster message sending time](https://www.callstack.com/case-studies/enhancing-applications-performance-for-expensify) - ISO 27001 certified 100+ enterprise clients ## React Native expertise, proven at enterprise scale. ### [Migrating From Native to React Native Without Slowing Down Delivery](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 ### [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 ### [Migrating 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 ### [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 ### [Migrating a legacy React Native app to Expo](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 ### [Modernizing 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 ### [Enhancing Expensify app performance](https://www.callstack.com/case-studies/enhancing-applications-performance-for-expensify) Expert Engineering · Finance **5x** faster message sending time EXPERT ENGINEERING · AGENTIC DELIVERY ## Put our expertise to work. 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. [Book consultation](https://www.callstack.com/contact) Open Source ## Build with our open-source tools. We open-source the tools behind our delivery model. Use them, fork them, or let us run them for you. [Check All Tools](https://www.callstack.com/open-source) [Explore AI Infrastructure](https://www.callstack.com/capabilities/self-hosted-ci-cd-infrastructure) - [React Native Brownfield](https://github.com/callstack/react-native-brownfield): Incrementally move your iOS and Android apps to React Native without breaking (552 stars) - [React Native Testing Library](https://github.com/callstack/react-native-testing-library): Simple and complete React Native testing utilities that encourage good testing practices (18.2M downloads/mo) - [React Native Builder Bob](https://github.com/callstack/react-native-builder-bob): Simple set of CLIs to scaffold and build React Native libraries for different targets (1.4M downloads/mo) - [React Native Pager View](https://github.com/callstack/react-native-pager-view): React Native wrapper for the Android ViewPager and iOS UIPageViewController (5.5M downloads/mo) - [React Native AI](https://github.com/callstackincubator/ai): On-device LLM execution in React Native with Vercel AI SDK compatibility (227.7K downloads/mo) - [Re.Pack](https://re-pack.dev/): A webpack-based toolkit to build your React Native application with full support of webpack ecosystem (2.2M downloads/mo) - [React Native Bottom Tabs](https://github.com/callstackincubator/react-native-bottom-tabs): Native Bottom Tabs for React Native (408.8K downloads/mo) - [Liquid Glass](https://github.com/callstack/liquid-glass): iOS Liquid Glass in React Native (539.2K downloads/mo) Insights ## Worth your time, by engineers. [Explore Insights](https://www.callstack.com/insights) - [AI-Assisted Migrations to React Native: From Months to Days](https://www.callstack.com/events/ai-assisted-migrations-to-react-native-from-months-to-days) (Apr 2 · Webinar): Reduce migration time from months to days by using AI in real React Native workflows. Learn when to migrate incrementally and when starting fresh is the better option. - [Building Apps Where AI Generates the UI](https://www.callstack.com/blog/building-apps-where-ai-generates-the-ui) (Mar 3 · Article): Most AI apps wrap powerful models in a simple chat interface. This piece explores a different direction: letting the model generate the interface itself. Instead of returning text, it describes what the user should see next. The UI is decided at runtime, adapting to each user and context rather than being hardcoded in advance. The article walks through the architecture behind this pattern and shows it in practice with a project that turns static PDF forms into adaptive, AI-driven interviews. - [Building v0 iOS and Fixing React Native Along the Way](https://www.callstack.com/podcasts/building-v0-ios-and-fixing-react-native-along-the-way) (Jan 12 · Podcast): A technical look at building v0 mobile with React Native and Expo, covering iOS-first decisions, native modules, and fixes pushed to React Native core. Featuring Fernando Rojo, Szymon Rybczak, and Oskar Kwaśniewski. - [From Brownfield Complexity to AI-Supported React Native Migration ](https://www.callstack.com/blog/from-brownfield-complexity-to-ai-supported-react-native-migration) (Mar 24 · Article): Brownfield migrations often fail due to ordering and integration gaps, not framework limits. This article explains how an AI-supported workflow helps enforce correct sequencing across packaging, startup, and runtime validation. - [From Teddy Bears to Voice Agents: Kraen Hansen on Voice AI, Local-First & App Security](https://www.callstack.com/podcasts/local-first-voice-ai-and-app-security) (Feb 17 · Podcast): What happens when you combine voice agents and teddy bears? A hands-on look at local-first systems, voice AI, and security lessons from poking real apps.