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Kultrix React Native developers build iOS and Android apps from a single codebase without sacrificing native feel. They master Expo, native module bridging, push notifications, offline sync, and App Store submission.
Start in 1-2 Weeks
Senior Engineers Only
7+ Years Experience
NDA
EXPERTISE
WHAT WE DO
We build iOS and Android apps from one React Native codebase, sharing 90%+ of business logic while respecting each platform's native design language and UX patterns.
We set up managed and bare Expo workflows, configure EAS Build and Submit for CI/CD, and handle over-the-air updates so you deploy hotfixes without App Store review delays.
When JavaScript alone is not enough, we write Objective-C/Swift or Kotlin bridge modules to access native APIs, camera, biometrics, Bluetooth, and background services.
We eliminate jank using Reanimated 3, Hermes engine tuning, FlatList optimisation, and Flipper profiling to hit 60fps animations on mid-range Android devices.
We handle App Store and Google Play submission, metadata, screenshots, review preparation, and Fastlane automation so releases go out on schedule without manual overhead.
We implement push notifications via Expo Notifications or Firebase Cloud Messaging, and add offline-first data sync with WatermelonDB or MMKV for uninterrupted user experience.
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 RN 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
React Native lets one developer ship production-quality iOS and Android apps from a shared codebase, typically cutting development cost by 40-60% versus maintaining two separate native projects. The JavaScript bridge has matured significantly - with Reanimated, Hermes, and the New Architecture, performance is near-native for most application types.
Standard placement is within 48 hours of contract signing. We maintain a bench of available React Native specialists at all times. For niche requirements (e.g., Bluetooth, AR, or payment terminal integrations), allow up to one week for matching.
We default to Expo for most projects because it dramatically simplifies the build and release pipeline. We use bare React Native when a project requires native modules not available in Expo, or when maximum control over native build configuration is needed. Both paths are well-supported by the Kultrix team.
Yes. We regularly join existing React Native projects to add features, fix performance issues, upgrade outdated dependencies, or migrate from Expo managed to bare workflow. We start with an audit of the current codebase and propose a prioritised action plan before writing new code.
Android is often the harder platform for React Native performance. Our developers enable the Hermes JavaScript engine, use Reanimated 3 for smooth animations on the UI thread, optimise list rendering with FlashList, reduce bridge crossings with the New Architecture (JSI), and profile with Flipper and systrace to find bottlenecks.
Yes. Our developers set up Fastlane for automated signing, build, and upload pipelines for both stores. They handle App Store Connect and Play Console configuration, prepare screenshots, write store listings, and guide you through the review process to minimise rejection risk.
Yes. We implement StoreKit 2 (iOS) and Google Play Billing (Android) using react-native-iap or RevenueCat as a cross-platform abstraction. We handle subscription logic, receipt validation, server-side entitlements, and restore purchases flows.
Zustand for global UI state and React Query for server state is our default combination - lightweight, TypeScript-friendly, and easy to test. For large enterprise apps with complex state machines, we use XState. Redux Toolkit remains a viable choice when the team already knows it well.
Offline support requires a deliberate architecture. We implement local-first data storage with WatermelonDB or MMKV, queue mutations when offline, sync on reconnect with conflict resolution, and surface connectivity state clearly in the UI. This is designed upfront, not bolted on later.
Yes. We write unit tests with Jest, component tests with React Native Testing Library, and end-to-end tests with Detox or Maestro for critical user flows. Test coverage is part of the definition of done on Kultrix engagements, not an optional extra.
We offer monthly retainer (fixed developer hours, guaranteed availability) and time-and-materials (billed weekly against tracked hours) models. Both include a dedicated account manager, transparent timesheets, and a structured weekly check-in. Minimum engagement is one month.
All Kultrix developers have a minimum of four years of professional React Native experience with shipped apps in both stores. They are assessed through technical interviews and practical take-home challenges before joining our bench. You will not receive a junior developer on your project.
