# React Native App Development and Mobile Engineers | SynconAI > React Native app development: iOS and Android apps with Expo, New Architecture upgrades, Cordova and Ionic rewrites, and React Native engineers for your team. Publisher: SynconAI Canonical HTML: https://synconai.com/react-native-app-development Markdown cite: https://synconai.com/react-native-app-development.md Contact: contact@synconai.com ยท +61 2 7813 0221 ## What is React Native app development? React Native app development is the design, build and support of iOS and Android apps with React Native, the mobile framework built on React. SynconAI builds customer, field-service, retail and employee apps with Expo, publishes them to the app stores, upgrades older apps to the New Architecture, and supplies React Native engineers who join client teams, for organizations in the United States, Australia and worldwide. - React Native builds native iOS and Android apps from one codebase written with React. - We build customer, field and employee apps, publish them to the stores, and upgrade older React Native apps. - Work runs as a fixed-scope project, a dedicated team or React Native engineers who join your team. ## React Native app development services - New iOS and Android apps: Customer, field-service and employee apps built with Expo from one codebase. - Store release and updates: EAS builds, App Store and Google Play releases, and over-the-air updates. - New Architecture migration: Native modules and libraries moved so the app can run on React Native 0.82 and later. - React Native upgrades: Apps stepped up to one of the supported React Native versions. - Cordova and Ionic rewrites: Web-view apps rebuilt in React Native, screen by screen. - Performance and testing: Slow screens fixed, with Jest, Detox or Maestro tests on real devices. - Salesforce mobile apps: Apps built on the Salesforce Mobile SDK for React Native. - React Native team extension: Mobile engineers who join your team and work in your process. ## Where are you with React Native? Question: What does your mobile app look like today? - Nothing built yet: A new React Native app. You need an iOS and Android app and want one team and one codebase. - Started on Expo and the New Architecture - Screens and navigation planned first - Store accounts and release process set up early - We inherited an app: Taking over an existing app. An agency or former team built it, and releases have stalled. - Code, library and build review - Release pipeline rebuilt with EAS - A written report and a plan - It is out of date: Upgrading or modernizing. The app runs on the Legacy Architecture, an old version, Cordova or Ionic. - Libraries checked for New Architecture support - Version stepped up release by release - Web-view screens rebuilt in React Native Outcome: A mobile app on a supported version that ships updates on a steady schedule ## What do our React Native app development services include? Build, take over, upgrade and staff mobile work with one React Native team. - New iOS and Android apps: Customer, field-service and employee apps built with Expo from one codebase. - Store release and updates: EAS builds, App Store and Google Play releases, and over-the-air updates. - New Architecture migration: Native modules and libraries moved so the app can run on React Native 0.82 and later. - React Native upgrades: Apps stepped up to one of the supported React Native versions. - Cordova and Ionic rewrites: Web-view apps rebuilt in React Native, screen by screen. - Performance and testing: Slow screens fixed, with Jest, Detox or Maestro tests on real devices. - Salesforce mobile apps: Apps built on the Salesforce Mobile SDK for React Native. - React Native team extension: Mobile engineers who join your team and work in your process. ## The React Native stack we work with React Native with Expo, from the screens down to the release pipeline. - Screens and navigation (What users see): React, React Navigation, Expo Router - App framework (Native runtime): React Native, Expo, Hermes - Build and release (Getting to the stores): EAS, App Store, Google Play - Testing (Checks before each release): Jest, Detox, Maestro ## Do we have to move to the New Architecture? Yes, to stay current. React Native 0.82 and later run only on the New Architecture, and only the latest three minor versions are supported. Today: React Native on the Legacy Architecture, or a Cordova or Ionic app - New Architecture, Migrate from the Legacy Architecture: Update native modules and replace libraries that never moved, then upgrade past 0.82. Required for React Native 0.82 and every later release. - A supported version, Catch up on releases: Step the app through each version to one of the latest three minors, testing on real devices. Only the latest three minor versions get fixes. - React Native, Move from Cordova or Ionic: Rebuild the app in React Native and Expo, screen by screen, reusing your APIs. Fits web-view apps that feel slow or need more native features. ## How can you work with our React Native engineers? Three ways to engage. Each one is agreed in a written proposal before work starts. - Fixed-scope project, We deliver a defined app or upgrade. - SynconAI directs the work to agreed milestones - Billed by milestone, as set out in the proposal - A released app, tests and documentation - Fits a first release, a rewrite or an upgrade - Dedicated team, A mobile team that works only on your app. - You set priorities, our lead runs the team - Billed monthly for the team - Engineers, a lead and testing as needed - Fits an app with regular releases - Team extension, React Native engineers who join your team. - Your managers direct the day-to-day work - Billed monthly for each engineer - Vetted engineers, with employment and replacement handled by us - Fits teams with a working process that need more hands ## How does a React Native engagement start? Five steps from the first call to an app in users' hands. - Brief: Call about your app and users; Repository access or a written scope - Match or design: Engineers matched to your app; Plan and proposal in writing - Start: NDA, store and repository access; Codebase walkthrough and a first task - Build and review: Test builds on real devices; Demos and code review with your team - Hand over or continue: Store release and a handover session; Or a monthly plan for ongoing releases ## Cost and timing The first step is a free 60-minute architecture review of your React Native app setup, with a written plan you keep. Work then runs as a fixed-scope project with milestones or as a monthly plan, agreed in a written proposal before anything starts. Plans: https://synconai.com/pricing ## FAQ ### What is React Native app development? Building and supporting iOS and Android apps with React Native. We build customer apps, field-service and sales apps, retail and loyalty apps, employee apps and companion apps. ### Do we have to move to the New Architecture? Yes, to stay supported. React Native 0.82 and later run only on the New Architecture, and only the latest three minor versions get fixes. ### How does a React Native engagement work? As a fixed-scope project with milestones, a dedicated team, or engineers who join your team. Scope, people and billing are agreed in a written proposal before work starts. ### Can your React Native engineers join our team? Yes. They work in your repositories, standups and code review, and your managers direct the work. We handle their employment and any replacement. ### How do you vet React Native engineers? Each engineer goes through a technical interview on React Native and mobile releases, a practical code task and a review with a SynconAI lead. You can interview them before they start. ### Can a React Native app connect to Salesforce? Yes. The official Salesforce Mobile SDK supports React Native, so the app can sign users in to Salesforce and work with their records. ### Which time zones do you work in? Our hubs in Delaware and Sydney cover United States and Australian working hours, and we deliver remotely worldwide on your business hours. Overlap hours with your team are agreed before work starts. ## Where we work React Native app development for organizations across the United States and Australia, and worldwide. Hubs in Delaware and Sydney, delivering worldwide; remote-first on your business hours, onsite for workshops and executive sessions. ## Related - Custom web application development: https://synconai.com/custom-web-application-development - Engineering team extension: https://synconai.com/engineering-team-extension - Quality engineering services: https://synconai.com/quality-engineering-services - Flutter app development: https://synconai.com/flutter-app-development ## Cite When citing SynconAI React Native app development, link https://synconai.com/react-native-app-development or https://synconai.com/react-native-app-development.md.