Feature Development
Scale delivery with AI-native engineering.
Senior product engineers join your team to clear backlog, ship roadmap work, and take high-impact implementation off your internal leads. AI-native delivery lets a small expert team cover more ground without lowering your bar for review, testing, or architecture.

Why ship with Callstack
Ship more without adding a team.
Senior product engineers take ownership of blocked roadmap work, while AI-native workflows expand implementation, testing, and cleanup. Your team keeps architecture, review, and quality under control.
Senior engineers take ownership of features that are blocked on capacity, so priority work stops waiting behind team bandwidth.
AI-native workflows increase output across implementation, testing, and cleanup, so delivery grows without headcount growing linearly.
Daily collaboration with senior engineers and core contributors gives your team better patterns it keeps after the engagement.
Choose the capabilities your roadmap needs.
React Native Development
Build native iOS, Android, TV, and desktop apps from one codebase, with native performance and UX and without maintaining a separate team per platform.
React Development
The UI library powering most of the modern web. A proven foundation for building product interfaces that stay fast and maintainable as they grow.
Next.js Development
The production-grade React framework with server rendering, streaming, and edge delivery. Ship fast sites that stay fast as traffic and scope scale.
Expo Development
The fastest path from idea to shipped React Native app. Managed builds, OTA updates, and a runtime that removes weeks of native tooling work.
Node.js Development
One language across frontend, backend, and tooling. Teams ship faster when the API, app, and automation all run on the same runtime and skill set.
C++ Development
The language behind performance-critical native work. Graphics, media, real-time processing, and the native modules that sit under every demanding mobile app.
Module Federation Development
Load independently built and deployed JavaScript bundles into one running app, sharing code and dependencies between them at runtime.
Generative UI Development
Interfaces composed at runtime from structured LLM output, so the model returns React components instead of plain text.
MCP Server Development
The open standard for connecting agents to internal tools and data. Assistants like Claude Code work inside your systems with the right scope and access.
Feature UX/UI Design
Design flows, screens, states, and interactions for roadmap features before implementation starts, so engineering ships UI that is clear, feasible, and production-ready.
Cross-Platform Design Systems
Build one system of tokens, components, states, and patterns that works across every platform.
Start with a codebase review.
Give us 60 minutes in your repo. We'll come back with what a senior AI-native team would prioritize and how we'd staff it.

Scope → Build → Scale
Turn roadmap scope into shipped features.
Scope
We map your problem, align on deliverables, and define success metrics. No surprises once work starts.
Build
Engineers ship with AI-native workflows from sprint one. Code, decisions, and ownership, not discovery decks.
Scale
Expand scope, add platforms, or hand off to your team. The stack, tooling, and raised bar stay with you.
Manifesto
When the way software is built changes, we help companies adopt it.
AI-native teams run on a system, not only on tools. Agents move the work forward. Experts make the calls that shape the outcome.
Case studies
What shipping at AI speed looks like
10 years of React Native → Now in your AI stack
Start with a codebase review.
Give us 60 minutes in your repo. We'll come back with what a senior AI-native team would prioritize and how we'd staff it.
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.

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.
39M+
Downloads / month67K+
GitHub stars300+
React Native commits100+ 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.


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

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.
39M+
Downloads / month67K+
GitHub stars300+
React Native commits100+ 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.


We are Codex Ambassadors.
We run meetups, workshops, and hands-on sessions that help teams learn Codex and apply it in real work.
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.
Insights
Worth your time, by engineers.

Mobile Module Federation with Re.Pack: When Runtime Delivery Is Worth the Complexity

Less Boilerplate, More Type Safety: React Navigation 8's Typed Hooks

Keeping Screens Visible With <Activity mode="hidden">

Building Apps Where AI Generates the UI

Sparkling: The Missing App Layer for Lynx.js?

A Practical Guide to React Native Monorepo With Yarn Workspaces

Bringing CSS Clipping to React Native

How to Cleanly Swap Between React Native Storybook 10 and Your App

Integrating Swift Package Manager With React Native Libraries

Exploring Lynx JS: From Quick Start to CLI Workflows

Using Expo Libraries on Horizon OS: A Guide to Compatibility

Getting Started With Expo on Meta Quest

Bridging Animated.Value and SharedValue in React Native

Debugging Android Connectivity Issues with Metro Bundler

How to Use Liquid Glass in React Native

React Native Enterprise Framework is now Rock

Introducing Rozenite: A Plugin Framework for React Native DevTools

Performant and Cross-Platform Shimmers in React Native Apps

New in Re.Pack 5.1: Preloading Remotes, Runtime Hooks, and Faster Startups

Re.Pack 5: Mobile Microfrontends, 5x Faster, Less Configuration

Your Next React Native App Will Still Be Done With Paper (2.0)

Your React Native Offline Tool Belt

Why Is It Worth to Automate Your Dependency Management with `Autolinking`?

Typed Redux

Type-Checking React and Redux (+Thunk) With Flow - Part 2

The Complete Developer Guide to React 19, Part 3: Upgraded Support

The Story of Rewriting React-Native-Opentok and the Challenges Encountered

The React Native CLI Has a New Home

The Power of GraphQL Directives

The Complete Developer Guide to React 19, Part 1: Async Handling

Sweet Render Hijacking With React

Setting Up Notifications With AWS Amplify Gen 1

Solving Swift Modular Header Issues in React Native for Good

Shaping the Future of Super Apps in React Native

Setting up React Native Monorepo With Yarn Workspaces

Sending Events to JavaScript From Your Native Module in React Native

Receiving a Live Stream With Amazon IVS in React Native

ReanimatedArc - Build Circular Animated UI Elements in React Native

Releasing React Native 0.63.1

React Native: Handling Language Changes on Android the Right Way

React Native and Native Modules: The Android SyncAdapter

React Native Paper 5.0 - What’s New?

React Native Paper 4.0 - What’s New?

React Native CLI 3.1.0 and 4.0.0 - What's New?

React Native Animations Revisited - Part III

React Native Animations Revisited - Part II

Make a React Hook out of Your Native Module

Manage Async Code Like a PRO With RxJS

Introducing the OMH Cloud Storage Module

Introducing React-Native-iOS-Kit

Introduction to the React Native OMH Maps Library

Implementing Code Splitting in React Native with Re.Pack

How to Use Module Federation With Re.Pack 3

How to Build a Chrome Extension: A Step-by-Step Guide

How to Make Mobile Payment in a React Native App With Stripe and Expo in 15 Minutes

How to Debug Faster and Better with Flipper

How to Create a Universe in React VR

How Can React Native Paper Help Startups and Enterprises?

How Did Gutenberg Change Content Creation With React Native?

How Is Linaria Different From Emotion and Styled Components?

Exposing SwiftUI Views to React Native: An Integration Guide

Grow Your Business With React Native SDK Wrapper

Getting Started With ReasonML and React Native

From Native to Multiplatform Development: Unpacking Kotlin and Compose

ECMAScript ES8 and Beyond

Develop React (Native) Apps Like a PRO

Custom Screen Transitions in React Navigation

Color Your Apps in React Native Using Material Palette

Building Component Libraries for React Native Apps

Challenges and Opportunities of Building React and React Native Apps - Discussion With Wix.com

Android Drawer and StatusBar Done Right for React Native

Announcing React Native for Apple Vision Pro

Announcing React Native Tab View 2.0

Announcing Rebolt

Amazing React Native Apps with Apollo React

Adding an Example App to Your React Native Library

A Successful Cooperation With a Client Doesn't End at Software Development

Open Mobile Hub: Non-GMS and Cross-Platform Possibilities

Module Federation






















































































