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ebooks

In-depth guides to React, React Native, and AI

Practical guides to cross-platform development, performance, and AI-assisted engineering, grounded in our work on production apps.

Enterprise
2026

React Native at Scale 2026

React Native has an established production record. Running it reliably at scale still takes clear ownership, release controls, and time for platform work.

This field guide draws on interviews and survey responses from 12 organizations with extensive or distinctive React Native experience. We connect their accounts with a decade of React Native contributions and enterprise delivery, including our work as core contributors and founding members of the React Foundation. Use it to decide what your organization needs to address next.

Brownfield
2026

Migration to React Native in the AI Era

AI agents can help teams understand how an existing mobile app behaves and recreate that behavior in React Native faster. Architecture, feature parity, release risk, and ownership still require human judgment.

This ebook gives mobile and engineering leaders a framework for making those decisions before committing to a full migration.

  • Compare brownfield, greenfield, and checkpoint-based migration paths
  • Keep product work moving during the transition
  • Use OTA updates with the right rollout, monitoring, and rollback controls
  • Build an ROI case from your current delivery data
Performance
2026

The Ultimate Guide to React Native Optimization

Callstack’s Ultimate Guide to React Native Optimization has become a trusted reference for React Native teams. This refreshed edition is built around the problems engineers are dealing with now: slow startup, dropped frames, re-renders, memory leaks, thread boundaries, and bundle bloat.

  • Built around practical performance work, not generic advice
  • Covers runtime smoothness and startup speed
  • Updated for the New Architecture and current React Native tooling
  • Written for developers, senior engineers, and tech leads
Virtual Reality
2026

React Native Developer’s Guide to Meta Horizon OS

If you already build with React Native, Meta Quest is a new platform you can reach without switching stacks. Because Meta Horizon OS is built on Android, React Native works where you’d expect: same workflow, same core abstractions, new form factor. VR changes the interface, not the fundamentals.

This hands-on guide shows you how to bring a real React Native app to Meta Quest, from setup and library choices to productive workflows and a store-ready release. Read it to find out how to:

  • Build and run a React Native app on Meta Quest using Expo Go and development builds
  • Understand what changes on Meta Horizon OS (permissions, input, performance)
  • Choose compatible libraries and swap in Quest-ready alternatives
  • Explore high-signal app categories that make sense in VR
  • Debug, profile, and integrate native modules with standard RN workflows
  • Create a store-ready build and publish it through Meta’s submission pipeline
TV
2025

The Ultimate Guide to React Native TV Development

Modern TV platforms share familiar foundations yet behave unlike any other device class. This guide gives you a clear path through that landscape, from understanding the hardware and operating systems to designing effective 10-foot interfaces, managing focus, streaming video reliably, and preparing an app for production at scale.

You’ll learn how React Native fits into the TV ecosystem, how to build for platforms like tvOS, Android TV, Tizen, and webOS, and how to navigate the practical engineering challenges behind living-room experiences.

  • Understand the TV ecosystem and its platform constraints
  • Design interfaces for the 10-foot experience and remote-driven navigation
  • Build performant TV apps using React Native and react-native-tvos
  • Implement video playback, accessibility, focus management, and testing strategies

Written by engineers at Callstack and Amazon with deep experience in cross-platform development, this guide helps teams use their React skills to ship consistent, reliable TV apps across devices.

Brownfield
2025

Incremental React Native Adoption in Native Apps

This guide is for iOS and Android teams who want to experiment with React Native gradually, without slowing delivery or rewriting the whole app.

You’ll get:

  • A side-by-side look at legacy vs. modern integration approaches
  • How the Packaging Approach and React Native Brownfield library simplify setup
  • Step-by-step walkthroughs for iOS and Android
  • Real-world migration insights from the Callstack team

This guide will help you bring React Native into production safely and incrementally.

Performance
2025

React Native Performance Optimization with DMAIC Guide

From struggling with slow app load times to inefficient user interactions, performance issues can harm your business and frustrate your users. This ebook presents a structured, data-driven approach, DMAIC-to diagnose, address, and sustain performance improvements in React Native applications. Based on a detailed real-world case study, you'll learn precisely how DMAIC can help achieve measurable enhancements:

  • Cut down app start times drastically.
  • Accelerate critical user interactions.
  • Maintain consistent performance through continuous monitoring.

Authored by Callstack's software engineers, this ebook provides actionable guidance to significantly boost your application's speed, efficiency, and overall user experience.

Performance
2025

Incremental React Native Adoption Reimagined

The challenges organizations face when migrating to React Native often feel familiar. In this guide, we detail three proven scenarios for adopting React Native, each illustrated by real-world examples from global enterprises. Discover how React Native can transform your applications effectively and safely, without disrupting business operations. Here's what you'll read about if you download it:

  • Validating React Native viability with a real-world Proof of Concept.
  • Consolidating development through hybrid migrations.
  • Replacing siloed native code with reusable React Native components.

Authored by Michał Pierzchała and with the input of software engineers working on brownfield projects on a daily basis, this guide provides clear instructions for implementing incremental React Native adoption in your organization.

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Nov 12Live Stream

Mobile Development, Plugins & AI-Powered Workflows

Join Kewin Wereszczyński and Hanno Gödecke on November 12 for live demos and a discussion of the Mobile Dev plugin and AI-powered mobile workflows.

Build, Launch, and Maintain: The Business Case for a Software Factory

Nov 10Article

Build, Launch, and Maintain: The Business Case for a Software Factory

Explore an anonymized software factory business case, its delivery workflow, and the staffing assumptions behind a projected 65% reduction in total costs.

Harness Engineering: Context, Skills, and Reliable AI Workflows

Nov 10Podcast

From Prompts to Harnesses: Building Reliable AI Workflows

Amazon’s Anisha Malde joins Łukasz Chludziński to discuss harness engineering, agent skills, and how AI is changing cross-platform development.

Building a Software Factory: Write Specs an Agent Can Build From — cover

Nov 6Article

Building a Software Factory: Write Specs an Agent Can Build From

Learn how to research requirements, resolve open decisions, and write testable specs that AI coding agents can implement without the planning conversation.

 Large-Scale Migrations With Coding Agents: Planning, Verification, and Rollback — cover

Nov 4Article

Large-Scale Migrations With Coding Agents: Planning, Verification, and Rollback

Plan codebase migrations with coding agents using reviewable requirements, verification checks, staged rollouts, and defined rollback criteria.

Conversational Banking: From Customer Questions to Authorized Actions — cover

Nov 2Article

Conversational Banking: From Customer Questions to Authorized Actions

Explore conversational banking architecture through a card-dispute example, covering tool access, authorization, execution, observability, and human handoff.

How AI Agents Can Cut Manual QA by 30% — cover

Oct 30Article

How AI Agents Can Cut Manual QA by 30%

Explore an agentic QA workflow targeting 30% less manual effort across mobile, web, and TV, with test selection, failure triage, and validation.

Building a Software Factory: The Night My Agents Waited for Me — cover

Oct 28Article

Building a Software Factory: The Night My Agents Waited for Me

Learn how permissions, review limits, and missing product decisions stalled two overnight coding agent runs, and how their maintainer revised the workflow.

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Oct 15Live Stream

Who Left the Agents Running? React Native Software Factories

Join Kewin Wereszczyński and Szymon Chmal to explore what can go wrong in a React Native software factory overnight and the controls that keep agents on track.

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Oct 14Podcast

When Coding Gets Faster, What Breaks Next?

Matt Hargett explains how AI moves bottlenecks across testing, deployment, infrastructure, support, and the rest of software delivery.

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Oct 13Podcast

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

Leonel Candido da Silva explains eBay's agentic monitoring workflow: specialized agents, MCP, PagerDuty reports, and plans to learn from past incidents.

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Oct 7Talk

Automating Mobile QA with Cloud Agents

Michał Pierzchała shows how cloud-based QA agents can test real iOS and Android user flows and bring screenshots, recordings, and logs into pull requests.

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Mar 19Tutorial

The Hard Way vs. The React Native AI SDK Way: Stop Writing Custom Modules for Every Model

Learn how React Native AI uses a unified provider model to switch between cloud and on-device LLMs without rewriting application logic, enabling reliable AI experiences online and offline.

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Mar 12Tutorial

Build Smarter Apps: Tool Calling & AI Orchestration Explained

Learn how on-device models in React Native can call tools, interact with external APIs, and return structured outputs you can use directly in application logic.

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Mar 5Tutorial

MLC LLM + React Native: On-Device AI Without the Pain

Learn how to run third-party on-device LLMs in React Native using MLC LLM. Choose your models, run them efficiently across platforms, and keep a unified JavaScript API with React Native AI.

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Feb 24Tutorial

Intelligent Fallbacks with Apple Intelligence in React Native

Learn how to use Apple’s built-in Foundation Models in React Native apps, reduce memory usage, and enable fast, fully on-device AI with React Native AI Apple.

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Feb 10Tutorial

What Is the React Native AI SDK? A Complete Intro & Quickstart

Learn why on-device AI matters for React Native apps, how local LLMs behave offline, and what problems React Native AI is designed to solve from day one.

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Jan 29Tutorial

Implementing an Android TurboModule with Kotlin

Learn how to implement a React Native TurboModule on Android, from the TypeScript spec and Codegen to the Kotlin implementation and package registration.

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Jan 19Tutorial

Working with Different Threads in Swift TurboModules

Learn how JavaScript, native module, background, and main threads interact in React Native TurboModules, and how to use GCD queues to run async work safely in Swift.

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Jan 9Tutorial

How to Add Type-Safe Constants to Swift TurboModules

Learn how to expose typed, immutable constants from a Swift TurboModule using Codegen, and get full end-to-end type safety between native and JavaScript.

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Dec 30Tutorial

Adding Event Emitters to Your TurboModule in Swift

Learn how to emit native events from a Swift TurboModule and subscribe to them in JavaScript, including proper memory management and Codegen integration.

Writing a Swift TurboModule in React Native

Dec 22Tutorial

Writing Your First TurboModule in Swift

Learn how to build a fully working TurboModule in Swift, integrate it with Codegen, and bridge it through Objective‑C inside an Expo app.