--- title: "Feature Development" description: "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." url: https://www.callstack.com/capabilities/feature-development updated: 2026-11-09T15:57:03.644Z --- # Feature Development 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. _[Expert Engineering](https://www.callstack.com/ai-native-engineering) › Feature Development_ **Ship priority features with React and React Native experts.** 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. [Book consultation](https://www.callstack.com/contact) [Explore services](#services) Trusted by 100+ Enterprise clients Expensify · Ticketmaster · DirecTV · MLS · PWC · Evernote · AutoZone · MoMo · Dream11 · Rainbow · Futurewei · RIMAC · Hello Fresh · Haaretz · ForaTravel · CelcomDigi · Teamworks · Boats · Questrade · Dialogue Why ship with Callstack ## Ship more without adding a team. Senior product engineers bring the specialist knowledge your roadmap needs. They join your existing team to tackle demanding features, own implementation, and share their expertise as they work. - **Access specialist expertise when you need it.** Bring in deep knowledge of framework internals, native integrations, and performance to unblock technically demanding features. - **Get more done with a smaller team.** AI-native workflows increase output across implementation, testing, and cleanup, so delivery grows without headcount growing linearly. - **Raise the team's bar while we work.** Daily collaboration with senior engineers and core contributors gives your team better patterns it keeps after the engagement. Services ## Choose the capabilities your roadmap needs. ### Stacks - [React Native Development](https://www.callstack.com/services/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](https://www.callstack.com/services/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](https://www.callstack.com/services/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](https://www.callstack.com/services/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](https://www.callstack.com/services/nodejs-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](https://www.callstack.com/services/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](https://www.callstack.com/services/module-federation-development): Load independently built and deployed JavaScript bundles into one running app, sharing code and dependencies between them at runtime. - [On-Device AI](https://www.callstack.com/services/run-ai-directly-on-the-device-for-speed-privacy-and-control): Run models directly on user devices for privacy, offline use, and low-latency experiences without a cloud round-trip. ### Design - **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. Feature Development ## 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. [Book a call](https://www.callstack.com/contact) How we work together ## Turn roadmap scope into shipped features. ### Extend your team 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 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 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 - React Foundation Founding Member · 300+ commits to React Native · Contributing since 2016 - 100+ Enterprise projects delivered - Industry runs on our tooling · 50M+ OSS downloads / month - [3.7× Lower task cost vs Opus 5.5](https://apex.callstack.com) - “With the release of Re.Pack 5 we now have an easy way to create the MiniApps and federated mobile apps that our users have been asking for.” — Zackary Chapple, CEO / Zephyr Cloud - [~6x Faster prototyping · 60+ Components mapped with full coverage · Figma · Claude · Server · Tailwind · Tokens · React · Cursor · ESLint](https://www.callstack.com/case-studies/engineering-ai-loops-for-a-cross-platform-design-system) - [React Native Paper · A component library in our open-source toolkit for building React Native interfaces.](https://github.com/callstack/react-native-paper) Case studies ## What shipping at AI speed looks like ### [Improving performance of Super App](https://www.callstack.com/case-studies/improving-performance-of-super-app-for-momo) Expert Engineering · Finance ### [Creating React Native SDK wrapper](https://www.callstack.com/case-studies/creating-react-native-sdk-wrapper-for-rive) Expert Engineering · Software Development **100k** weekly downloads on npm ### [Building a browser-based React Native playground](https://www.callstack.com/case-studies/building-a-browser-based-react-native-playground-for-expo) Expert Engineering · Software Development ### [Migrating to Next.js for better performance and SEO](https://www.callstack.com/case-studies/migration-to-nextjs-for-autozone) Expert Engineering · Automotive **#1** SEO rank, recovering from 3-9 ### [Modernizing React Native codebase and adding platform features](https://www.callstack.com/case-studies/modernizing-react-native-codebase-for-7cup) Expert Engineering · Healthcare **130%** increase in users post-upgrade ### [React Universe App: Networking evolved with Liquid Glass](https://www.callstack.com/case-studies/react-universe-app-networking-evolved-with-liquid-glass) Expert Engineering · Software Development **63%** adoption rate; majority of attendees registered in the app ### [Launching a white-label Super App](https://www.callstack.com/case-studies/launching-white-label-super-app-for-zephyrcloud) Expert Engineering · Software Development 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. [Book a call](https://www.callstack.com/contact) Open Source ## Build with our open-source tools. We open-source the tools behind our delivery model. Use them, fork them, or let us run them for you. [Check All Tools](https://www.callstack.com/open-source) [Explore AI Infrastructure](https://www.callstack.com/capabilities/self-hosted-ci-cd-infrastructure) - [React Native Paper](https://github.com/callstack/react-native-paper): Material Design for React Native (Android & iOS) (2M downloads/mo) - [React Native Bottom Tabs](https://github.com/callstackincubator/react-native-bottom-tabs): Native Bottom Tabs for React Native (408.8K downloads/mo) - [React Navigation](https://github.com/react-navigation/react-navigation): Routing and navigation for your React Native apps (218.4K downloads/mo) - [Liquid Glass](https://github.com/callstack/liquid-glass): iOS Liquid Glass in React Native (539.2K downloads/mo) - [Voltra](https://github.com/callstackincubator/voltra): Voltra lets React Native developers build native iOS Live Activities, Dynamic Island layouts, and widgets as React components without writing Swift. (88.1K downloads/mo) - [Linaria](https://github.com/callstack/linaria): Zero-runtime CSS in JS library (12.4K stars) - [React Native Vision OS](https://github.com/callstack/react-native-visionos): A framework for building native visionOS applications using React Native (1.1K stars) Insights ## Worth your time, by engineers. [Explore Insights](https://www.callstack.com/insights) - [Multi-Window React Native Apps With the Meta VR Layout SDK](https://www.callstack.com/blog/multi-window-react-native-apps-with-the-meta-vr-layout-sdk) (Oct 15 · Article): 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. - [How To Build a Plugin Framework by Hacking React Native DevTools](https://www.callstack.com/events/how-to-build-a-plugin-framework-by-hacking-react-native-devtools) (Oct 7 · Talk): Szymon Chmal explains how he built Rozenite, a plugin framework for React Native DevTools, and shows what developers can create with it. - [Where Reanimated Goes Next](https://www.callstack.com/podcasts/where-reanimated-goes-next) (Jul 7 · Podcast): A conversation with Bartłomiej Błoniarz on CSS animations in Reanimated, native primitives on iOS, shared element transitions, and the work still left on stability. - [Mobile Module Federation with Re.Pack: When Runtime Delivery Is Worth the Complexity](https://www.callstack.com/blog/mobile-module-federation-with-re-pack-when-runtime-delivery-is-worth-the-complexity) (Jul 2 · Article): This article explains what Module Federation means in React Native and how Re.Pack brings runtime-loaded JavaScript modules to mobile apps. It shows where this architecture can help, where packages or code splitting are the better choice, and what teams need to validate before adopting it in production. - [Less Boilerplate, More Type Safety: React Navigation 8's Typed Hooks](https://www.callstack.com/blog/less-boilerplate-more-type-safety-react-navigation-8s-typed-hooks) (Jun 29 · Article): React Navigation 8 makes typed hooks much more useful in day-to-day TypeScript work. Passing a screen name to useRoute, useNavigation, or useNavigationState gives you more specific types, cleaner route.params, and fewer unsafe casts or bulky composite types. This article breaks down what changed and where the improvements pay off most. - [Build a React Native App With the TanStack Stack](https://www.callstack.com/events/build-a-react-native-app-with-the-tanstack-stack) (Apr 30 · Live Stream): Join Callstack’s live stream on building a React Native app from the ground up using the TanStack toolbelt. - [Expo UI with SwiftUI and Jetpack Compose in practice](https://www.callstack.com/events/expo-ui-meets-native-jetpack-compose-and-swiftui-in-practice) (Mar 26 · Live Stream): Exploring Expo UI with SwiftUI and Jetpack Compose, including setup challenges, architecture tradeoffs, and real-world developer insights. - [Keeping Screens Visible With \](https://www.callstack.com/blog/keeping-screens-visible-with-activity-mode-hidden) (Mar 5 · Article): \`\\` can reduce unnecessary work by unmounting effects for inactive UI trees. But it also hides the UI with \`display: none\`, which causes issues for gesture‑driven navigation. This article explores a workaround that keeps screens visible while still freezing effects across native and web.