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GeezerVison is showing www.callstack.com — React & React Native Blog | AI Engineering | Callstack

AI
11/10/2026

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

An anonymized proposal illustrates how an agentic software factory could support product development and maintenance. The cost model projects approximately 65% lower total costs across the initial build and three years after launch, assuming one engineer supervises the post-launch workload allocated to five engineers in the reference scenario. The article explains the workflow, human responsibilities, operating costs, and handover behind that forecast.

Szymon Chmal

Software Developer

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AI
11/6/2026

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

Szymon Chmal uses a Simlock device-cleanup feature to explain how he plans work for coding agents. Follow the process from code research and product decisions to testable tasks, independent specification checks, and human approval.

Szymon Chmal

Software Developer

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Callstack

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AI
11/4/2026

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

Organize a large-scale codebase migration around documented requirements, scoped agent tasks, and human review. This article covers verification, telemetry, staged rollout, and rollback criteria.

Hur Ali

Software Engineer

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Callstack

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AI
11/2/2026

Conversational Banking: From Customer Questions to Authorized Actions

How does a banking assistant turn a customer’s question into an authorized action? Follow an unfamiliar payment from transaction lookup to card freeze and specialist handoff, exploring how models, banking services, and human teams work together and what the bank needs to control at each step.

Paweł Sawicki

Senior AI Engineer

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Callstack

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Testing
10/30/2026

How AI Agents Can Cut Manual QA by 30%

Two days waiting for QA can turn a small fix into another round of rebasing and context switching. See how a workflow using AI agents could cut manual QA effort by 30% across mobile, web, and TV, and learn how to validate the gains.

Karol Latusek

Software Engineer

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AI
10/28/2026

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

Two coding agents worked overnight on Simlock and ended up waiting for their maintainer. This article examines the questions that stopped them and the workflow changes that followed, from recurring permissions and review limits to product choices agents can make provisionally for human review.

Szymon Chmal

Software Developer

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Callstack

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AI
10/22/2026

Your AI Coding Agent Still Needs an Architecture

AI coding agents make implementation decisions about logic, dependencies, and shared behavior. A favorites feature illustrates how explicit contracts, gradual migration, behavior tests, and automated dependency checks give engineers a basis for reviewing those decisions.

Szymon Chmal

Software Developer

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Callstack

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Testing
10/20/2026

Give QA Agents the Controls They Need With Appduct

Appduct lets AI QA agents call functions registered by your team inside a running app. This article illustrates how an adjustable app clock and a simulated invitation event can prepare conditions for UI checks.

Szymon Chmal

Software Developer

@

Callstack

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Virtual Reality
10/15/2026

Multi-Window React Native Apps With the Meta VR Layout SDK

Add a second Quest window to your existing React Native tree without creating another Android activity. Follow a Meta VR Layout SDK companion-panel demo covering setup, shared state, window positioning, fallbacks, and testing with Meta Spatial Simulator.

Tomasz Włodarczyk

Software Engineer

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Callstack

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Testing
10/13/2026

Agentic Mobile Testing With e2e and agent-device

TesterArmy's e2e uses agent-device to drive mobile tests on iOS and Android. This article walks through goal-based actions, deterministic checks, the mobile engine, and replay caching, then shows how to initialize a test setup. Cached agent.act steps skip model calls; agent.assert continues to evaluate the current screen.

Michał Pierzchala

Principal Engineer

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AI
10/9/2026

How to Maximize AI SDLC? Measure the Outer Business Loop, Not the Inner Developer Loop

Matt Hargett explains how to measure AI-assisted development through the Outer Business Loop, which follows a change from its initial hypothesis to its effect on users and the business. An online platform optimization anchors his systems thinking approach to checking feature exposure, investigating mixed results, and calculating the holistic end-to-end cost of a measurable improvement.

Matt Hargett

Consulting Principal Engineer

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Callstack

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React Foundation
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100+ Enterprise Clients
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7B+ active users
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Backed by Viking Global
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ISO 27001
·
React Foundation
·
100+ Enterprise Clients
·
7B+ active users
·
Backed by Viking Global
·
ISO 27001
·
React Foundation
·
100+ Enterprise Clients
·
7B+ active users
·
Backed by Viking Global
·
ISO 27001
·
React Foundation
·
100+ Enterprise Clients
·
7B+ active users
·
Backed by Viking Global
·

Insights

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Nov 12·Live 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 10·Article

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 10·Podcast

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 6·Article

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 4·Article

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 2·Article

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 30·Article

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 28·Article

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 15·Live 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 14·Podcast

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 13·Podcast

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 7·Talk

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 19·Tutorial

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 12·Tutorial

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 5·Tutorial

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 24·Tutorial

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 10·Tutorial

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 29·Tutorial

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 19·Tutorial

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 9·Tutorial

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 30·Tutorial

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.

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Dec 22·Tutorial

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.

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