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Kultrix Expo developers build React Native applications using Expo's managed and bare workflows, EAS Build, and over-the-air update infrastructure.
Start in 1-2 Weeks
Senior Engineers Only
7+ Years Experience
NDA
EXPERTISE
WHAT WE DO
We build iOS and Android apps using Expo's managed workflow, native dependencies handled by Expo SDK, zero native IDE configuration, and a development experience that focuses on product logic rather than toolchain.
We configure Expo Application Services (EAS) Build for cloud-based native builds, EAS Submit for automated App Store and Google Play submission, and EAS Update for over-the-air JavaScript delivery.
We implement file-system-based routing with Expo Router, deep linking, typed routes, tab and stack navigation, and universal links that work consistently on iOS, Android, and web.
We configure EAS Update channels for instant JavaScript updates between app store releases, critical bug fixes and feature flags shipped to users in minutes, not days.
When Expo SDK does not cover a requirement, we implement custom native modules via Expo Modules API in Swift and Kotlin, the modern replacement for the old React Native bridge.
We profile Expo apps with Flipper and the React Native DevTools, eliminate unnecessary re-renders, implement Reanimated 3 animations on the UI thread, and optimise image loading with expo-image.
WHO THIS IS FOR
Whether you are a startup or enterprise, we have the right engagement for you.
Fast-track your MVP with senior talent. Launch on time and within budget.
Improve performance, UX, and features of your existing product with expert help.
Augment your team with senior specialists to accelerate feature delivery.
OUR APPROACH
Choose the cooperation format that best fits your business goals and development velocity.
Fast launch to test your idea and gather user feedback with minimal investment.
What's included
Timeline Typically 9-16 weeks
Complete cycle from initial strategy and design to final launch.
What's included
Timeline Typically 20-40 weeks
Scale your team with expert developers to accelerate development.
What's included
Timeline Flexible / Long-term
OUR HIRING PROCESS
Tell us about your project goals, timeline, and team needs. We'll set up a free consultation to dive deeper into your requirements.
Based on your project, we recommend the ideal team structure, engagement model, and technology approach - tailored to your goals and budget.
We handpick the best-fit professionals from our senior talent pool. You'll meet them, review their experience, and give the green light.
Your team onboards within 48 hours. We align on workflows, set up communication, and start delivering results from week one.
As your project evolves, we scale your team, add new specialists, or adjust scope - all within your existing partnership.
INDUSTRIES
Our Expo Developer professionals build solutions across various sectors.
Data-driven commerce solutions that improve journeys, boost sales, and optimize operations.
Data-driven commerce solutions that improve journeys, increase sales, and optimize operations.
Reliable medical platforms that protect patient data, simplify workflows, and support clinical accuracy.
Product-driven platforms that enhance workflows, automate processes, and scale with your business.
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Expert professionals ready to join your team and deliver results.
CASE STUDIES
Testimonials
What impressed us most was how Kultrix handled the full stack - frontend, backend, and mobile - with one cohesive team. Communication was clear, delivery was predictable, and the final product exceeded what we initially scoped.
Co-CEO
Kultrix built both our web platform and mobile app from scratch. Their team understood the complexity of our industrial workflows and translated them into clean, intuitive interfaces. We launched on time and our operators adopted the tools immediately.
Co-CEO
Kultrix handled everything for us - landing page, dashboard, mobile app, and even a Chrome extension. Having one team own the entire product surface meant everything felt connected and consistent. They shipped fast and the quality speaks for itself.
CEO, Ping Proxies
Kultrix has been our go-to partner for multiple projects - from marketing websites to full mobile applications and backend systems. They scale up when we need speed and maintain consistency across every project. Reliable, fast, and technically strong.
CEO, Volume Apps
Working with Kultrix on our mobile app and backend was seamless. They brought strong product thinking to every sprint, not just code. When priorities shifted, they adapted quickly without losing momentum. Exactly the kind of partner a product team needs.
Product Lead, Pelago
We needed a team that could handle mobile development, server infrastructure, and AI features all at once. Kultrix delivered on all three fronts. Our fitness platform went from concept to production in under four months with zero compromises on quality.
CEO, Fitblast
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FAQ
Expo is a framework and set of tools built on top of React Native that handles the native layer configuration, build pipeline, and over-the-air update infrastructure. The managed workflow provides a curated set of native modules without requiring Xcode or Android Studio for most development tasks. This dramatically reduces the operational overhead of React Native development - faster onboarding, simpler CI/CD, and the ability to ship OTA updates without an app store review cycle.
Standard start time is 48 hours from contract signing. Expo developers are among our most available React Native profiles. For engagements requiring specific Expo SDK integrations - expo-camera, expo-sensors, or custom native modules - a two-to-three day matching window is typical.
The managed workflow lets Expo handle all native configuration - you write only JavaScript/TypeScript and Expo's Continuous Native Generation (CNG) produces the native projects automatically. The bare workflow exposes the native iOS and Android directories for full control, at the cost of managing native code yourself. Most new Expo projects should start managed and eject to bare only when a specific native requirement cannot be met with the Expo Modules API or community plugins.
EAS Build is Expo's cloud build service for creating native iOS (.ipa) and Android (.aab/.apk) binaries without requiring a Mac or a properly configured Xcode/Android Studio environment. Builds run on Expo's infrastructure, handle code signing automatically, and integrate with EAS Submit for one-command App Store and Google Play upload. It significantly simplifies the CI/CD setup for React Native applications.
Over-the-air updates allow you to ship JavaScript bundle changes to users without going through App Store or Google Play review. This is extremely valuable for critical bug fixes that cannot wait for a review cycle, minor UI improvements, and feature flag updates. OTA updates are limited to JavaScript layer changes - they cannot update native code, which still requires a full app store release. EAS Update provides channel-based rollout with rollback capability.
Yes. When the Expo SDK and community packages do not cover a requirement, we write custom native modules using the Expo Modules API - a modern Swift and Kotlin API that replaces the old React Native bridge approach. This covers native hardware integrations, platform-specific functionality, and performance-critical native code. We avoid the old bridge-based approach on new projects due to its deprecation in the New Architecture.
We implement push notifications using expo-notifications, which provides a unified API across iOS and Android. This covers device token registration, local and remote notification scheduling, notification categories and actions, foreground notification handling, and deep linking from notification taps. For high-volume production notification delivery, we configure the backend to use the Expo Push Notification service or direct APNs/FCM for maximum reliability.
Yes. Expo supports React Native for Web, allowing iOS, Android, and browser targets from a single codebase. This works well for utility applications where a native-feeling mobile app and a functional web experience are both needed. For web experiences where SEO, full accessibility, and rich browser functionality are priorities, we recommend a separate Next.js web application sharing a business logic package with the Expo app rather than a single universal codebase.
Expo SDK releases roughly twice a year with breaking changes and new features. Our developers follow the official upgrade guide, use the expo-doctor CLI to identify compatibility issues, update dependencies methodically, test on both platforms after each upgrade, and rebuild any custom native modules that are affected by API changes. We recommend staying within one SDK version of the latest release to avoid accumulated upgrade debt.
Yes. We write unit tests with Jest for business logic and custom hooks, component tests with React Native Testing Library for UI behaviour, and end-to-end tests with Maestro or Detox for critical user flows. EAS Build integrates test execution into the CI pipeline so tests run on every build before the binary is submitted to the stores.
Yes. Migrating from bare React Native to Expo managed workflow (or Expo with CNG) is a well-defined process. We audit the existing native modules, replace them with equivalent Expo SDK or community Expo plugins where available, write custom Expo plugins for any remaining native customisations, and convert the build pipeline to EAS. The result is reduced native maintenance burden and access to the Expo Update infrastructure.
Monthly retainer engagements offer a fixed weekly developer allocation with guaranteed availability - well-suited to ongoing Expo app development with regular releases. Time-and-materials engagements are billed weekly against tracked hours - better for defined scopes like a new app build or a migration project. Both options include weekly progress reports, transparent timesheets, and a dedicated account manager. Minimum engagement is one month.
