---
title: "Web App Development"
description: "Build fast, typed web apps with React and Next.js, ready to extend across mobile, desktop, or TV from one codebase."
url: https://www.callstack.com/services/web-app-development
updated: 2026-11-06T10:10:20.253Z
---

# Web App Development

Build fast, typed web apps with React and Next.js, ready to extend across mobile, desktop, or TV from one codebase.

_[Expert Engineering](/ai-native-engineering) › [End-to-End Product Development](/capabilities/end-to-end-product-development)_

**Build web apps that scale across platforms**

React on the web, built to outlast rewrites. Typed, fast, owned by your team, and ready to extend to mobile, desktop, or TV from one codebase when you are. Agents accelerate the build. Experts own the quality.

[Start with a product scoping call](#contact) · [How it works](#what-you-get)

## End-to-End Product Development

- 100+ Enterprise projects delivered
- React Foundation Founding Member · 300+ commits to React Native · Contributing since 2016
- 3x Delivery acceleration · 80% Effort executed by agents
- Industry runs on our tooling · 50M+ OSS downloads / month
- 5 Platforms under one React Native codebase · tvOS · Fire TV · Tizen · LG · Vizio
- Expensify uses agent-device. Mobile bug evidence and profiling are part of its documented usage story.

## What you get: Build a web app ready to extend.
- **Production-ready foundations** Typed code, scalable file structure, and modern React tooling. Built to standards, not just to ship.
- **Fast everywhere** Optimized load, rendering, and interactivity. Your app feels fast on every device, not just the demo.
- **Ready for more platforms** One codebase that extends to native, desktop, or TV when you are ready, not a rewrite later.
- **CI/CD from day one** Pipelines, staging, preview links, and testing built in from the first commit, not bolted on.
- **Component system** Reusable UI, design tokens, and structure that make it easy to grow or redesign without breaking things.
- **You own everything we build** Clear structure, docs, and naming so your team takes full ownership. No lock-in, no black box.
- **Ship at AI speed** Agents handle scaffolding, refactors, and tests under senior review; experts own architecture and quality. More shipped per sprint, same bar.
- **Enterprise-grade, built in** Security, accessibility, and reliability standards proven across 100+ enterprise projects serving billions of users, structured to scale from first launch.

**Start on a foundation that scales** Build or extend a high-performance web app. 3 Callstack engineers ship like 6, with impact visible before sprint two. [Start with a product scoping call](#contact)

## How we work together: Take one product from scope to scale.

### Extend your team (1 week)
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 (1-12 months)
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 (as needed)
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

## What shipping at AI speed looks like.

- [Building Storybook Connect for JetBrains Twice as Fast With AI](/case-studies/building-storybook-connect-for-jetbrains-in-25-working-days): 2× Estimated AI-assisted delivery speedup
- [Accelerating Teamworks' Mobile Delivery With Re.Pack and Module Federation](/case-studies/accelerating-teamworks-mobile-delivery-with-re-pack-and-module-federation): 10 min from code change to mini-app release
- [Migrating iOS and Android Apps to React Native for AutoZone](/case-studies/migrating-ios-and-android-apps-to-react-native-for-autozone): 2x growth in mobile user base during the migration period
- [Launching a High-Performance React Native App on Samsung TV](/case-studies/launching-samsung-tv-app-for-global-streaming-platform): 5 platforms under one RN codebase: tvOS, FireTV, Tizen, LG, Vizio

**Start on a foundation that scales** Build or extend a high-performance web app. 3 Callstack engineers ship like 6, with impact visible before sprint two. [Start with a product scoping call](#contact)

> We had been struggling with React Native application performance until we met Callstack.
>
> — Huỳnh Chí Hùng, Associate Director / MOMO

We’ll connect you with the right expert within 24 hours.

## Let’s find the right path for your product.

Still have questions?
Whether you’re planning new work or unblocking an existing product, we’ll help you choose the right path forward.
**What types of web applications can you build?**

We build modern web applications that are fast, scalable, and easy to evolve, ranging from B2B platforms to customer-facing products and internal tools.
**Why use React for modern web apps?**

React lets us build high-performance apps that stay maintainable over time, on a foundation built to outlast rewrites rather than need one later.
**How do you ensure performance and SEO?**

We optimize load, rendering, and interactivity so your app feels fast on every device, not just the demo. SEO is built into the architecture, not added as an afterthought.
**What does "platform expansion" actually mean?**

Your app is built so one codebase extends to native, desktop, or TV when you are ready, using the same core code and structure, not a rewrite later.
**Can you integrate with our team and existing tools?**

Yes. We adapt to your stack and workflows, and set you up with clear structure, docs, and naming so your team takes full ownership. No lock-in, no black box.
**Can you help us build or scale a design system?**

Absolutely. We can create a component system from scratch or extend what you have, using design tokens and reusable UI that make it easy to grow or redesign without breaking things.
**How quickly can we get started?**

We can usually begin within a few days, with impact visible before sprint two.
**How do you use AI to ship faster without dropping quality?**

Agents handle scaffolding, refactors, and tests under senior review, while our experts own architecture and quality. You get more shipped per sprint at the same bar, three of our engineers ship like six.
[Book consultation](#contact)

## Open source

- [React Native Paper](https://github.com/callstack/react-native-paper): Material Design for React Native (Android & iOS)
- [React Navigation](https://github.com/react-navigation/react-navigation): Routing and navigation for your React Native apps
- [React Native Pager View](https://github.com/callstack/react-native-pager-view): React Native wrapper for the Android ViewPager and iOS UIPageViewController
- [React Native Slider](https://github.com/callstack/react-native-slider): React Native component exposing Slider from iOS and SeekBar from Android
- [React Native Bottom Tabs](https://github.com/callstackincubator/react-native-bottom-tabs): Native Bottom Tabs for React Native

Insights

## Worth your time, by engineers.

[Explore Insights](https://www.callstack.com/insights)

- [Working With the React Native Super App Showcase Repository](https://www.callstack.com/blog/working-with-the-react-native-super-app-showcase-repository) (Aug 31 · Article): This article explains how the Super App Showcase structures a React Native super app around a Host Shell, federated mini apps, and a Shared SDK. It covers how Re.Pack and Module Federation load feature bundles at runtime while the host keeps native code and shared singletons consistent. The cold-start sequence shows how these parts work together, while the sections that follow cover module setup, shared state, real-time data, and UI performance. The final section focuses on production requirements for remote bundle discovery and version compatibility.
- [Why Banking App Modernization Stalls Before It Ships](https://www.callstack.com/blog/why-banking-app-modernization-stalls-before-it-ships) (Jun 17 · Article): This article looks at why banking app modernization often slows down after the strategy is set. We cover the delivery problems that show up as apps grow, from release coordination and testing to observability and cross-team ownership. We also explain why architecture alone does not solve them and what a shared platform function can do to help banks ship faster without losing control.
- [Mobile vs. VR: Key Differences in Features, UI, and UX](https://www.callstack.com/blog/mobile-vs-vr-key-differences-in-features-ui-and-ux) (Dec 8 · Article): This article highlights the core shifts developers face when moving from mobile screens to VR windows. It explains how windowing, typography, spacing, accessibility, and interaction patterns behave differently in a headset, and shows how to apply those changes in React Native. By understanding these differences, you can design 2D UIs that feel natural, readable, and comfortable on Meta Quest.
- [What You Can Build With React Native on Meta Quest](https://www.callstack.com/blog/what-you-can-build-with-react-native-on-meta-quest) (Nov 6 · Article): This article offers inspiration for Meta's $1.5M Developer Competition by outlining what you can build with React Native on Quest. It details app possibilities like meditation, interactive games, and MR experiences, encouraging developers to use VR-specific features.
- [Learn Once, Write for VR: A React Native Showcase for Meta's HorizonOS](https://www.callstack.com/blog/learn-once-write-for-vr-a-react-native-showcase-for-metas-horizonos) (Oct 8 · Article): This article details the successful creation of a React Native app for Meta's HorizonOS. It proves the framework is a viable solution for building performant VR experiences by reusing code and leveraging familiar libraries. The resulting showcase app includes camera integration, audio playback, and smooth navigation.
- [Cross-Platform TV Apps With React Native for tvOS, Android TV, and Tizen](https://www.callstack.com/blog/cross-platform-tv-apps-with-react-native-for-tvos-android-tv-and-tizen) (Oct 3 · Article): While widely known for mobile, React Native's flexible architecture makes it a proven and practical solution for building TV applications. This article explores how "out-of-tree" platforms allow developers to escape the fragmented world of traditional TV SDKs (tvOS, Android TV, webOS) and unify their workflow. Whether your team is new to React Native or already has a mobile codebase, you'll discover the benefits of code sharing, improved developer experience, and how major companies are using it to efficiently deliver production-ready apps to the living room screen.
- [Working With the Super-App-Showcase Repository](https://www.callstack.com/blog/case-study-super-app-template) (Apr 12 · Article): The super-app-showcase repository is a case study demonstrating how to structure a super app using Re.Pack and Module Federation. We explore its monorepo setup, catalog server for version compatibility, shared state management, and shell app for streamlined testing and integration.
- [Why Your Business Needs a Super App](https://www.callstack.com/blog/why-have-a-super-app) (Apr 11 · Article): Super apps are gaining popularity worldwide as a way to consolidate many services into one mobile platform. This guide explores what super apps are, how they work, and the key benefits they offer businesses - from improving user engagement to reducing development costs.
- [Why Use React Native for Windows?](https://www.callstack.com/blog/why-use-react-native-for-windows) (Sep 8 · Article): React Native Windows lets you extend your React Native app to desktop with native Windows features. It provides a familiar React Native developer experience while invoking UWP technologies behind the scenes.
- [Super App Development](https://www.callstack.com/blog/super-app-development) (Apr 10 · Article): Super apps combine multiple services into a single platform. This guide walks through how to build super apps from scratch or migrate existing apps using Re.Pack, an open-source toolkit for React Native. It also covers how super app development can help scale teams and processes while delivering real business benefits.
- [Simple Chat App With React Native - Part II](https://www.callstack.com/blog/simple-chat-app-with-react-native-part-2-frontend) (Dec 28 · Article): Connecting a React Native chat app frontend to a backend involves setting up Socket.IO for real-time communication, using Redux for state management, and creating actions and reducers to handle sending and receiving messages. This guide walks through the key steps, from connecting to the server to displaying conversations and messages in the UI.
- [Simple Chat App With React Native - Part I](https://www.callstack.com/blog/simple-chat-app-with-react-native-part-1-backend) (Oct 23 · Article): Building a chat app with React Native doesn't have to be complicated. In this two-part series, we walk through how to create the backend using Hapi.js for the server, MongoDB for the database, and Socket.IO for real-time communication. This post focuses on setting up the core infrastructure and defining routes to create conversations and messages.
- [Is PWA Development the Best Mobile Solution for Your Business?](https://www.callstack.com/blog/pwa-mobile-development-solutions-for-business) (Jun 26 · Article): Progressive Web Apps (PWAs) offer a fast way to deliver web apps with mobile-like features, without the full complexity of native apps. This guide explores the key capabilities, benefits, and tradeoffs of PWAs compared to native iOS and Android apps for different use cases.
- [Is This Possible With React Native?](https://www.callstack.com/blog/is-this-possible-with-react-native) (Feb 15 · Article): React Native can handle complex challenges like integrating with external hardware, building real-time music players, and working offline. This article shares case studies of how Callstack helped clients build apps that push the boundaries of what's possible with React Native.
- [How to Build Universal Lens Protocol Social Apps With React Native](https://www.callstack.com/blog/how-to-build-universal-lens-protocol-social-apps-with-react-native) (Jan 12 · Article): Building a universal social app on Lens Protocol is easier than you think. This guide walks through creating a cross-platform React Native app with a feed and profiles powered by the decentralized Lens social graph.
- [How to Optimize Development Efficiency When You’re Building a Super App](https://www.callstack.com/blog/optimize-development-efficiency-when-building-super-app) (Apr 12 · Article): Building a super app involves careful planning to optimize development efficiency. This guide shares practical tips for preparing your app for third-party contributions and fostering smooth collaboration between teams working on different modules.
- [How to Build a Desktop App With React Native for Windows](https://www.callstack.com/blog/how-to-build-a-desktop-app-with-react-native-for-windows) (Sep 15 · Article): Building desktop apps with React Native for Windows is now easier than ever. This step-by-step guide walks through setting up a new project, developing features, testing, debugging, and publishing to the Microsoft Store.
- [How React Native Development Can Save Your Business in the Time of Coronavirus Pandemic](https://www.callstack.com/blog/how-react-native-development-can-save-your-business-in-the-time-of-coronavirus-pandemic) (Apr 3 · Article): Businesses are facing new challenges due to the coronavirus pandemic. React Native cross-platform development can help quickly build online presence, launch mobile apps, and ship features faster while reducing costs. This guide walks through three common scenarios where React Native brings measurable benefits to adapt in changing times.
- [Cross-Platform Web3 dApps With React Native](https://www.callstack.com/blog/cross-platform-web3-dapps-with-react-native) (Dec 28 · Article): Building cross-platform Web3 dApps doesn't have to mean maintaining separate codebases. This guide walks through using React Native, Expo, and Web3Modal to build a dApp that works seamlessly on web, iOS, and Android from a single codebase.
- [Developing a React Native TV App](https://www.callstack.com/blog/developing-a-react-native-tv-app) (Dec 6 · Article): React Native is making TV app development more accessible. This guide explores two approaches: using Expo for quick setup or bare React Native for more control. It shows how to add TV support to existing projects and structure apps to handle multiple platforms.
- [Build Modern Web3 dApps on Ethereum With React Native and Viem](https://www.callstack.com/blog/build-modern-web3-dapps-on-ethereum-with-react-native-and-viem) (Oct 25 · Article): Viem and WalletConnect are powerful tools for building modern web3 dApps on Ethereum with React Native. This guide walks through how to use viem to query blockchain data and interact with wallets, showcasing its performance and developer experience advantages over traditional libraries.
- [Best DX for React Native Web3 dApps With Web3Modal and Wagmi](https://www.callstack.com/blog/best-dx-for-react-native-web3-dapps-with-web3modal-and-wagmi) (Nov 13 · Article): Wagmi and Web3Modal make it easier than ever to build web3 dApps with React Native. This guide walks through setting up a new project, connecting to wallets, querying blockchain data, signing messages, and sending transactions.
- [Business Landscape of Super Apps: Frequently Asked Questions](https://www.callstack.com/blog/super-app-business-faq) (Apr 12 · Article): Super apps are becoming increasingly popular as a way to provide users with a seamless, all-in-one mobile experience. This FAQ answers common questions about the business aspects of super app development, including market potential, benefits and risks, and the impact on your organization.
- [Business Benefits of React Native Windows](https://www.callstack.com/blog/business-benefits-of-react-native-windows) (Sep 13 · Article): React Native Windows offers concrete business benefits for desktop app development. This guide breaks down how it enables more accurate project estimation, faster development velocity, and easier long-term maintenance compared to traditional approaches.
- [Aiming for Success in the TV App Development Space With React Native](https://www.callstack.com/blog/aiming-for-success-in-the-tv-app-development-space-with-react-native) (Dec 3 · Article): Building TV apps with React Native requires rethinking user interactions for a lean-back experience and navigating platform fragmentation. This guide shares strategies to balance code sharing with platform-specific optimizations, prioritize testing, and embrace best practices to create compelling big screen experiences.
- [Amazon Fire TV Stick App in React Native](https://www.callstack.com/blog/amazon-fire-tv-stick-app-in-react-native) (Feb 2 · Article): Building apps for Amazon Fire TV Stick with React Native is an adventure. We walk through how to enable adb, get an empty app running, handle remote control events, and create custom selectable components to build an RSS reader app.
- [Add-Ons for Web Browsers With React](https://www.callstack.com/blog/how-react-can-be-used-for-web-browser-add-on-development) (May 15 · Article): Building your own browser add-on can be a great way to solve specific problems or boost productivity. This guide walks through how to use React to create the UI for browser extensions, covering project setup, key components, and rendering your first view.
- [A Step-By-Step Guide to Super App Development With Re.Pack 5](https://www.callstack.com/blog/step-by-step-guide-to-super-app-development) (Jul 21 · Article): This hands-on guide shows how to turn two React Native applications into a minimal super app. Configure Re.Pack 5 and Module Federation, expose a mini app, register it in a host, and load it with React.lazy while handling loading and error states.
- [What AI Changes for Paywalls and Monetization](https://www.callstack.com/podcasts/what-ai-changes-for-paywalls-and-monetization) (Jul 7 · Podcast): Perttu Lähteenlahti (RevenueCat) talks about AI-generated paywalls, MCP tooling, monetization experiments, and what RevenueCat is building next across mobile and web.
- [How Voice Agents Handle Latency, Turn-Taking, and Safety](https://www.callstack.com/podcasts/how-voice-agents-handle-latency-turn-taking-and-safety) (Jun 29 · Podcast): Kræn Hansen (ElevenLabs) talks voice-agent UX, from turn-taking and safety to layered SDK design for React and React Native.
- [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.
- [Bringing React Native to VR on Meta Quest](https://www.callstack.com/podcasts/bringing-react-native-to-vr-on-meta-quest) (Nov 26 · Podcast): Learn how Meta Quest uses React Native for 2D panels in 3D spaces, why AOSP matters, and how developers can bring existing RN apps to VR with minimal friction.
- [Amazon's Vega OS: A New OS With React Native Built-In](https://www.callstack.com/podcasts/amazons-vega-os-a-new-os-with-react-native-built-in) (Nov 25 · Podcast): Giovanni Laquidara (Amazon) introduces Vega OS, a new lightweight operating system with React Native built-in, designed for high-performance on low-end media devices.
- [React Native at Scale With NFL](https://www.callstack.com/podcasts/react-native-at-scale-with-nfl) (Sep 19 · Podcast): Discover how the NFL uses React Native, Expo, and a monorepo to ship apps across iOS, Android, web, and TV with one stack.
- [Stepping Into New Dimension With React Native VisionOS](https://www.callstack.com/podcasts/stepping-into-new-dimension-with-react-native-visionos) (May 31 · Podcast): Try immersing yourself in the React Universe with React Native visionOS! Listen about the latest changes in the framework & watch a 3D app demo.
- [React Native for TV App Development](https://www.callstack.com/podcasts/react-native-for-tv-app-development) (Dec 13 · Podcast): Learn about the current state of the TV development space and the benefits and considerations of applying React Native to it.
- [React Native for Apple Vision Pro and visionOS](https://www.callstack.com/podcasts/react-native-for-apple-vision-pro-and-visionos) (Dec 21 · Podcast): In this episode, Łukasz invites Oskar and Michał to discuss their experimental journey of bringing React Native to Apple Vision Pro and visionOS.
- [React Native Development on Windows](https://www.callstack.com/podcasts/react-native-development-on-windows) (Sep 14 · Podcast): Explore how React Native Windows compares to Electron, its benefits for desktop apps, and practical tips for getting started or migrating from native apps.
- [Multiplatform App Development With React Native](https://www.callstack.com/podcasts/multiplatform-app-development-with-react-native) (Feb 15 · Podcast): Even if your product is primarily for one platform, the reality of your users demanding smooth experiences and impeccable functioning on many others will hit you sooner or later. Building for mobile, web, TV, or even VR might feel like juggling a dozen balls at once—each calling for a dedicated skill set, timeline, and budget.
- [Multiple TV Platforms, One Codebase: React Native TV App Development](https://www.callstack.com/podcasts/multiple-tv-platforms-one-codebase-react-native-tv-app-development) (Mar 5 · Podcast): Is TV app development is the same as mobile, but bigger? It's not. In this episode, Michael Khirallah (DIRECTV) and Chris Trag (Amazon) will explain why.
- [Building the Future of Mobile Web3](https://www.callstack.com/podcasts/building-the-future-of-mobile-web3) (Nov 14 · Podcast): Do Web3 and React Native go together? Tune in to our discussion about the possibilities & challenges of building cross-platform mobile apps with blockchain.
- [React Native on Meta Quest: What We Learned About Building for VR](https://www.callstack.com/events/react-native-on-meta-quest-a-developers-guide-to-building-for-vr) (Dec 4 · Live Stream): See Meta Quest used as a practical dev setup and watch the team build and test React Native features directly inside a VR workspace.
- [Building React Native App for Vega OS](https://www.callstack.com/events/deep-dive-building-react-native-app-for-vega-os) (Oct 2 · Live Stream): React 19.2 brings \<Activity\> and useEffectEvent, new ideas for React state management arrive, and Vega OS debuts as a React Native-powered Linux OS.
- [Building Cross-Platform Federated Modules with React, React Native, and Re.Pack](https://www.callstack.com/events/building-cross-platform-federated-modules-with-react-react-native-and-re-pack) (Jun 13 · Talk): Discover how Module Federation and Re.Pack enable true cross-platform super apps with React Native. Learn best practices and real-world strategies for dynamic, modular architectures.
- [Building Universal Super Apps With React & React Native](https://www.callstack.com/events/building-universal-super-apps-with-react-react-native) (May 21 · Talk): Discover how to build universal Super Apps using React and React Native. Join Mike Grabowski, CTO at Callstack, as he explores dynamic code delivery, native UI rendering, and how RePack bridges the gap with Module Federation.
- [Super App Development Made Easy With Re.Pack](https://www.callstack.com/events/super-app-development-repack) (Jun 2 · Webinar): Watch the webinar recording and learn how to build secure, modular React Native super apps with Re.Pack, Module Federation, and remote bundles.
- [Scaling Teams With Federated Super Apps](https://www.callstack.com/events/scaling-teams-with-federated-super-apps) (May 19 · Talk): App developers shape code, but communication with others truly designs products. This talk explores how React and Conway’s law influence this process.
- [Spatial Computing With React](https://www.callstack.com/events/spatial-computing-with-react) (May 16 · Talk): JavaScript powers a React Native journey on Apple Vision Pro, adapting to spatial apps and visionOS quirks for a unique dev experience.
- [React Native ❤️ Apple Vision Pro](https://www.callstack.com/events/react-native-apple-vision-pro-57413) (Sep 7 · Talk): In this talk, Oskar talks about bringing React Native to Vision Pro and building VR apps with React
- [How to Scale Teams, Product Development, and Release Process With Re.Pack](https://www.callstack.com/events/scale-teams-product-development-and-release-process-re-pack) (Jul 8 · Webinar): Join us to learn how Re.Pack helps manage complexity in React Native apps, enables scalable teams, and boosts release processes.
- [Mastering the Big Screen: React Native for TV](https://www.callstack.com/events/mastering-the-big-screen-react-native) (Oct 2 · Webinar): Tune in to the recording of a webinar we held with with Amazon to explore the best practices of TV app development in React Native.
- [Building React Universe Conf App With Replit](https://www.callstack.com/events/building-react-universe-conf-app-with-replit) (Feb 24 · Live Stream): Mike and Oskar tried both Repl.it and Bolt.new to code a new conference app, and after burning millions of tokens, they fell back to Cursor.
- [Build Universal Web3 Apps With React Native](https://www.callstack.com/events/build-universal-web3-apps-with-react-native) (Apr 5 · Talk): Learn how to use React Native to build true cross-platform experiences (iOS, Android and Web) for your decentralized apps, from a single codebase.