AI-Native Engineering

End-to-End Product Development

Streaming App Development

Streaming App Development

Build high-performance streaming apps for every screen

Native apps for tvOS and Android TV, web for Tizen and webOS, plus mobile, from one React Native codebase. Smooth playback and focus that works on every remote.

Book consultation
How we can help
Streaming App Development
What you get

Make streaming work on every screen.

Optimized video playback

Buffering, controls, fullscreen, and resolution switching tuned per platform. Playback that just works.

Focus that never traps users

Consistent remote navigation across screens and components, so viewers stay in control everywhere.

Fast startup, smooth UX

Quick launch, fluid transitions, and efficient state on older smart TVs and low-end boxes. Our Samsung TV rewrite cut TTI by 28.6%.

Platform-specific features

Apple TV top shelf, Android TV recommendations, voice search, enabled where each platform supports it.

Shared logic, native UI

One codebase for auth, browsing, and watch history, with UI adapted to fit each screen it runs on.

Production-grade CI/CD

Automated pipelines, device testing, and store submission, so you ship reliably on every platform.

Streaming App Development

Feature parity on every screen

Ship a streaming app that meets platform standards across TV, mobile, and web, without growing your team.

Book consultation

Scope → Build → Scale

Take one product from scope to scale.

Scope

We map your problem, align on deliverables, and define success metrics. No surprises once work starts.

Start in weeks, not months
Fixed scope before work starts
1 WEEK

Build

Engineers ship with AI-native workflows from sprint one. Code, decisions, and ownership, not discovery decks.

3 Callstack engineers ship like 6
Impact visible before sprint two
1-12 MONTHS

Scale

Expand scope, add platforms, or hand off to your team. The stack, tooling, and raised bar stay with you.

You own everything we build
Move faster on the next launch
AS NEEDED

Case studies

What shipping at AI speed looks like

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End-to-End Product Development
Self-Hosted CI/CD Infrastructure

Accelerating Teamworks' Mobile Delivery With Re.Pack and Module Federation

10

min from code change to mini-app release

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End-to-End Product Development
Feature Development

React Universe App: Networking Evolved With Liquid Glass

63%

adoption rate; majority of attendees registered in the app

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Feature Development
End-to-End Product Development

Building a browser-based React Native playground for Expo

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AI-Assisted Migrations
End-to-End Product Development
Self-Hosted CI/CD Infrastructure

Migrating iOS and Android Apps to React Native for AutoZone

2x

growth in mobile user base during the migration period

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Architecture & Performance
End-to-End Product Development

Optimizing Android TV Startup for Global Streaming Platform

5%

faster startup time on FireTV and FireHD devices

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End-to-End Product Development
Self-Hosted CI/CD Infrastructure
Architecture & Performance

Launching a High-Performance React Native App on Samsung TV

5

platforms under one RN codebase: tvOS, FireTV, Tizen, LG, Vizio

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Architecture & Performance
End-to-End Product Development

Improving Chat Performance and Creating a Custom UI Library for Dream11

78%

bundle size reduction (from 50 MB to 11 MB)

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End-to-End Product Development
Feature Development
Team Training

Enhancing Performance of Momo's Super App With Re.Pack

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AI-Assisted Migrations
Feature Development
End-to-End Product Development

Modernizing 7Cup's React Native Codebase and Adding Platform Features

130%

increase in users post-upgrade

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End-to-End Product Development
Feature Development

Launching White-Label Super App for Zephyr Cloud With Re.Pack

10 years of React Native → Now in your AI stack

Feature parity on every screen

Ship a streaming app that meets platform standards across TV, mobile, and web, without growing your team.

Book consultation

Why teams bet on Callstack

From billion-user apps to React Native core, this is why teams choose Callstack when they need to move fast and get it right.

Rocket ascending into a blue night sky with digital binary code forming its smoke trail.

10 years in React Native. Now shaping agentic engineering.

For a decade, we have helped define how teams ship with React Native. Now we are helping shape how they work with agents.

Founded in 2016 ·Backed by Viking Global Investors

React Foundation members. Core Contributors.

We are founding members of React Foundation and Core Contributors to React Native. You get direct access to people close to the decisions shaping the frameworks you use.

Open source since 2016. Our code runs in your app.

We contribute to React Native and maintain libraries across its ecosystem. Our code runs in apps used by millions of people every day.

Open Source Projects

39M+

Downloads / month

67K+

GitHub stars

300+

React Native commits

100+ Enterprise clients with 7B+ users.

We work with teams shipping at real scale. You get a partner used to high-stakes products, not learning on your roadmap.

Agent Conf. The conference for the Agentic era.

The conference we built for the shift from writing code to orchestrating agents.

Agent Conf
Gradient background blending white, light blue, and purple shades with smooth transitions.Man wearing glasses and a Stanford sweatshirt speaking into a microphone during a presentation.

We are Codex Ambassadors.

We run meetups, workshops, and hands-on 
sessions that help teams learn Codex 
and apply it in real work.

Check Events
Rocket ascending into a blue night sky with digital binary code forming its smoke trail.

10 years in React Native. Now shaping agentic engineering.

For a decade, we have helped define how teams ship with React Native. Now we are helping shape how they work with agents.

Founded in 2016 ·Backed by Viking Global Investors

React Foundation members. Core Contributors.

We are founding members of React Foundation and Core Contributors to React Native. You get direct access to people close to the decisions shaping the frameworks you use.

Open source since 2016. Our code runs in your app.

We contribute to React Native and maintain libraries across its ecosystem. Our code runs in apps used by millions of people every day.

Open Source Projects

39M+

Downloads / month

67K+

GitHub stars

300+

React Native commits

100+ Enterprise clients with 7B+ users.

We work with teams shipping at real scale. You get a partner used to high-stakes products, not learning on your roadmap.

Agent Conf. The conference for the Agentic era.

The conference we built for the shift from writing code to orchestrating agents.

Agent Conf
Gradient background blending white, light blue, and purple shades with smooth transitions.Man wearing glasses and a Stanford sweatshirt speaking into a microphone during a presentation.

We are Codex Ambassadors.

We run meetups, workshops, and hands-on 
sessions that help teams learn Codex 
and apply it in real work.

Check Events
Still have questions?

Let’s find the right path
for your product.

Whether you’re planning new work or unblocking an existing product, we’ll help you choose the right path forward.

Book consultation

What platforms do you support for streaming apps?

We support all major streaming platforms, including tvOS, Android TV, Tizen, webOS, and mobile platforms like iOS and Android, using React Native and web technologies.

Can I really use one codebase for all those platforms?

Yes. We structure your app so core logic and components are shared, with platform-specific tweaks where needed, no separate apps to maintain.

How do you handle TV-specific requirements?

We map platform requirements early, navigation, guidelines, metadata, and store rules, and build features like remote handling and deep links to meet platform expectations and deliver a smooth user experience.

Will the app perform well on lower-end or older devices?

Yes. We test on a range of devices and optimize for memory usage, load times, and rendering speed, especially on slower smart TVs or older Android boxes.

Can you work with our in-house dev team?

Definitely. We often join as a dedicated extension to your team, focusing on cross-platform delivery, streaming tech, and platform quirks, while your team handles product and feature logic.

How do you make video playback smooth across platforms?

We tune buffering, controls, fullscreen, and resolution switching per platform, so playback just works on every screen.

How do you handle remote navigation and focus?

We build consistent focus across screens and components, so viewers never get trapped and stay in control on every remote.

How do you ship reliably across so many platforms?

We set up production-grade CI/CD with automated pipelines, device testing, and store submission, so you ship reliably on every platform.

Streaming App Development

Feature parity on every screen

Ship a streaming app that meets platform standards across TV, mobile, and web, without growing your team.

We had been struggling with React Native application performance until we met Callstack.

Huỳnh Chí Hùng

Associate Director / MOMO

Open Source

Want to build it on your own?

We open-source the tools behind our delivery model.
Use them, fork them, or let us run them for you.

Check All Tools
Explore AI Infrastructure
React Native Paper

Material Design for React Native (Android & iOS)

1661612
downloads / month
React Navigation

Routing and navigation for your React Native apps

226436
downloads / month
React Native Pager View

React Native wrapper for the Android ViewPager and iOS UIPageViewController

4723460
downloads / month
React Native Slider

React Native component exposing Slider from iOS and SeekBar from Android

3745223
downloads / month
React Native Bottom Tabs

Native Bottom Tabs for React Native

324677
downloads / month

Insights

Worth your time, by engineers.

Explore Insights
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Jun 17
·
Article

Why Banking App Modernization Stalls Before It Ships

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.
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Dec 8
·
Article

Mobile vs. VR: Key Differences in Features, UI, and UX

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.
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Nov 6
·
Article

What You Can Build With React Native on Meta Quest

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.
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Oct 8
·
Article

Learn Once, Write for VR: A React Native Showcase for Meta's HorizonOS

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.
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Oct 3
·
Article

Cross-Platform TV Apps With React Native for tvOS, Android TV, and Tizen

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.
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Apr 12
·
Article

Working With the Super-App-Showcase Repository

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.
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Apr 11
·
Article

Why Your Business Needs a Super App

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.
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Sep 8
·
Article

Why Use React Native for Windows?

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.
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Apr 10
·
Article

Super App Development

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.
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Dec 28
·
Article

Simple Chat App With React Native - Part II

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.
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Oct 23
·
Article

Simple Chat App With React Native - Part I

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.
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Jun 26
·
Article

Is PWA Development the Best Mobile Solution for Your Business?

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.
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Feb 15
·
Article

Is This Possible With React Native?

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.
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Jan 12
·
Article

How to Build Universal Lens Protocol Social Apps With React Native

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.
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Apr 12
·
Article

How to Optimize Development Efficiency When You’re Building a Super App

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.
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Sep 15
·
Article

How to Build a Desktop App With React Native for Windows

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.
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Apr 3
·
Article

How React Native Development Can Save Your Business in the Time of Coronavirus Pandemic

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.
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Dec 28
·
Article

Cross-Platform Web3 dApps With React Native

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.
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Dec 6
·
Article

Developing a React Native TV App

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.
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Oct 25
·
Article

Build Modern Web3 dApps on Ethereum With React Native and Viem

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.
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Nov 13
·
Article

Best DX for React Native Web3 dApps With Web3Modal and Wagmi

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.
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Apr 12
·
Article

Business Landscape of Super Apps: Frequently Asked Questions

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.
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Sep 13
·
Article

Business Benefits of React Native Windows

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.
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Dec 3
·
Article

Aiming for Success in the TV App Development Space With React Native

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.
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Feb 2
·
Article

Amazon Fire TV Stick App in React Native

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.
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May 15
·
Article

Add-Ons for Web Browsers With React

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.
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Jul 21
·
Article

A Step-By-Step Guide to Super App Development With Re.Pack 5

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.
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Jul 7
·
Podcast

What AI Changes for Paywalls and Monetization

Perttu Lähteenlahti (RevenueCat) talks about AI-generated paywalls, MCP tooling, monetization experiments, and what RevenueCat is building next across mobile and web.
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Jun 29
·
Podcast

How Voice Agents Handle Latency, Turn-Taking, and Safety

Kræn Hansen (ElevenLabs) talks voice-agent UX, from turn-taking and safety to layered SDK design for React and React Native.
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Jan 12
·
Podcast

Building v0 iOS and Fixing React Native Along the Way

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.
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Nov 26
·
Podcast

Bringing React Native to VR on Meta Quest

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.
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Nov 25
·
Podcast

Amazon's Vega OS: A New OS With React Native Built-In

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.
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Sep 19
·
Podcast

React Native at Scale With NFL

Discover how the NFL uses React Native, Expo, and a monorepo to ship apps across iOS, Android, web, and TV with one stack.
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May 31
·
Podcast

Stepping Into New Dimension With React Native VisionOS

Try immersing yourself in the React Universe with React Native visionOS! Listen about the latest changes in the framework & watch a 3D app demo.
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Dec 13
·
Podcast

React Native for TV App Development

Learn about the current state of the TV development space and the benefits and considerations of applying React Native to it.
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Dec 21
·
Podcast

React Native for Apple Vision Pro and visionOS

In this episode, Łukasz invites Oskar and Michał to discuss their experimental journey of bringing React Native to Apple Vision Pro and visionOS.
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Sep 14
·
Podcast

React Native Development on Windows

Explore how React Native Windows compares to Electron, its benefits for desktop apps, and practical tips for getting started or migrating from native apps.
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Feb 15
·
Podcast

Multiplatform App Development With React Native

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.
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Mar 5
·
Podcast

Multiple TV Platforms, One Codebase: React Native TV App Development

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.
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Nov 14
·
Podcast

Building the Future of Mobile Web3

Do Web3 and React Native go together? Tune in to our discussion about the possibilities & challenges of building cross-platform mobile apps with blockchain.
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December 4, 2025
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Event

React Native on Meta Quest: What We Learned About Building for VR

See Meta Quest used as a practical dev setup and watch the team build and test React Native features directly inside a VR workspace.
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October 2, 2025
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Event

Building React Native App for Vega OS

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.
June 13, 2025
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Event

Building Cross-Platform Federated Modules with React, React Native, and Re.Pack

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.
May 21, 2025
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Event

Building Universal Super Apps With React & React Native

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.
June 2, 2023
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Webinar

Super App Development Made Easy With Re.Pack

Watch the webinar recording and learn how to build secure, modular React Native super apps with Re.Pack, Module Federation, and remote bundles.
May 19, 2022
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Event

Scaling Teams With Federated Super Apps

App developers shape code, but communication with others truly designs products. This talk explores how React and Conway’s law influence this process.
May 16, 2024
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Event

Spatial Computing With React

JavaScript powers a React Native journey on Apple Vision Pro, adapting to spatial apps and visionOS quirks for a unique dev experience.
September 7, 2024
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Event

React Native ❤️ Apple Vision Pro

In this talk, Oskar talks about bringing React Native to Vision Pro and building VR apps with React
July 8, 2024
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Webinar

How to Scale Teams, Product Development, and Release Process With Re.Pack

Join us to learn how Re.Pack helps manage complexity in React Native apps, enables scalable teams, and boosts release processes.
October 2, 2024
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Webinar

Mastering the Big Screen: React Native for TV

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.
February 24, 2025
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Event

Building React Universe Conf App With Replit

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.
April 5, 2024
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Event

Build Universal Web3 Apps With React Native

Learn how to use React Native to build true cross-platform experiences (iOS, Android and Web) for your decentralized apps, from a single codebase.