React Native mobile app development · EonTech Poland

A React Native mobile app development company, senior only.

EonTech is a Poland-based React Native mobile app development company. We ship one TypeScript codebase to iOS and Android, drop to native exactly where it earns its keep, and hand you back full ownership of the source, the pipelines, and the store accounts.

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  • Senior engineers only
  • Your time zone
  • You own the code
Senior only
The engineers who scope your app are the ones who build it
Honest stack
We recommend native when the job truly calls for it
Your IP
Source, pipelines, and store accounts stay with you

Why this page exists

A practical guide to hiring a React Native partner

Cross-platform mobile is not the debate it used to be. React Native has grown up — Hermes is fast, Fabric is stable, the New Architecture is real, and the tooling around signing, CI, and store submission is finally boring in the good way. What is still true is that most React Native apps live or die on the seniority of the team that builds them, and on the honesty of the platform-choice conversation up front.

EonTech is a Poland-based full-cycle engineering agency covering custom software development, web and mobile, cloud and DevOps, QA, and custom AI/ML model development. Our React Native practice draws on the same senior bench that ships our other work — so when we take on your app, you get a real engineering culture behind it, not a resume forwarded from a staffing pool.

The rest of this page is a working guide for CTOs, product leads, and non-technical founders comparing a React Native mobile app development company against a native-only shop, a generic offshore vendor, or two separate iOS and Android teams.

Key benefits

Why EU buyers pick us for cross-platform mobile

Six practical reasons product teams pick EonTech over a native-only shop or a generic offshore vendor when scoping a new app.

  • One codebase, two stores

    As a React Native mobile app development company we deliver iOS and Android from a single TypeScript codebase — cutting build cost by roughly a third compared to two native teams shipping the same feature set.

  • Senior EU engineers only

    No junior-heavy pyramids. Every engineer we field has shipped production React Native apps to real users — the same senior bench that builds our custom software and AI work.

  • Nearshore, real-time overlap

    Poland (CET) gives full-day overlap with the UK, EU, and Nordics, and roughly six hours with US East Coast. Standups, reviews, and pairing happen live.

  • Native when it counts

    We drop to Swift or Kotlin for Bluetooth, camera pipelines, biometrics, payments, or high-frequency work. Cross-platform is a decision, not a religion.

  • You own everything

    Source, CI pipelines, App Store and Play Store accounts, signing keys — all yours from day one. No proprietary runtime, no lock-in, no surprise bill when you switch teams.

  • One partner across the stack

    The same reactnative mobile app development company can extend into web, backend, cloud, DevOps, and custom AI when scope grows past the mobile app.

When it fits

Cross-platform when it helps, native when it counts

React Native shines when most of your app is forms, lists, navigation, and standard interactions, and you want one team shipping to both stores. That covers the majority of business and consumer apps.

Where you need deep platform UX, heavy graphics, or sustained native performance, we bridge to Swift or Kotlin. The decision is engineering, not ideology, and we make the trade-off explicit before you commit.

See our mobile practice

What we build

From first screen to a release pipeline

Whether you are launching a new app or extending one you already ship, we carry the patterns React Native apps need to grow without seizing up.

  • Greenfield apps

    New consumer and B2B apps where reaching both stores quickly matters more than squeezing the last frame of native performance.

  • Existing-app modules

    Brownfield integration: we add React Native screens into a native app you already ship, so you migrate incrementally instead of rewriting.

  • Design systems

    Shared component libraries and theming so your app stays consistent as it grows, with accessibility built into each primitive.

  • Native integrations

    Bluetooth, camera, biometrics, payments, and platform SDKs wired through well-typed native modules when the JS bridge is not enough.

  • Offline & sync

    Local-first data, conflict handling, and background sync for apps that must keep working when the network does not.

  • Release engineering

    Signing, store submission, staged rollouts, and crash reporting set up once so shipping is routine, not a recurring emergency.

Engineering practice

The discipline behind a stable app

  • Typed end to end. TypeScript across the app, with strict linting and shared types between client and API.
  • Tested where it matters. Unit, component, and end-to-end coverage on the flows that carry revenue or risk.
  • CI/CD from day one. Automated builds, preview binaries on every pull request, and reproducible signed releases.
  • Observability built in. Crash analytics, performance traces, and release-health dashboards you actually watch.
  • Security by default. Secure storage, certificate pinning, and dependency auditing baked into the pipeline.
  • Performance budgets. Startup, list, and animation budgets enforced so the app stays fast as it grows.

Industry relevance

Where our React Native apps already ship

Domain fluency shortens every architecture call. These are the buyer shapes our senior engineers already know, without a two-week onboarding glossary.

  • Fintech & payments

    Card, wallet, KYC, and PSD2 flows with biometric login and secure storage. Regulated builds that behave the same on both stores.

  • E-commerce & retail

    Catalogue, cart, and checkout that feel native, with push, deep links, and loyalty flows shared across iOS and Android.

  • Logistics & field ops

    Driver, dispatcher, and warehouse apps designed for poor connectivity, one-hand use, and long shifts.

  • Healthtech & wellness

    Patient companions, tracking, and telehealth clients built around consent, encryption, and platform health-kit integration.

  • SaaS mobile clients

    Companion apps for web-first SaaS products — dashboards, notifications, and admin actions on the go.

  • Media & consumer

    Content apps, social clients, and creator tools with fast startup, buttery lists, and predictable release cadence.

How we deliver

A path from idea to a store-ready build

  1. 01

    Validate the platform choice

    We start by checking that React Native is right for your app. If a feature demands native, we say so before you commit a budget to the wrong stack.

  2. 02

    Set the foundations

    Navigation, state, theming, and CI are stood up first. Senior engineers establish the patterns so the codebase scales past the first few screens.

  3. 03

    Ship in vertical slices

    Each sprint delivers a working flow end to end — UI, data, and native glue — with a demo you can put in front of real users.

  4. 04

    Harden and release

    Store submission, staged rollout, and monitoring. We hand over a repeatable release process, not a one-off binary.

  5. 05

    Iterate on production data

    Once live, we watch crash-free rates, performance traces, and funnels, and ship code and design changes in short cycles.

Trust & compliance

The signals procurement checks for

The paperwork is not the exciting part, but it is what separates a calm engagement from an audit-flagged one — especially for regulated apps in fintech and healthtech.

  • GDPR-native

    Poland is an EU member state; delivery runs under GDPR by default. DPAs and SCCs, where they apply, are ready to sign.

  • IP is yours

    Source code, signing keys, and store accounts are yours from day one — assigned in writing, not held hostage.

  • Secure by default

    Secure storage, certificate pinning, SSO, hardware-key MFA for engineer access, and dependency auditing in CI.

  • Transparent invoicing

    Monthly, itemised by engineer and rate. No hidden margins on store fees or cloud credits.

  • Named escalation

    An account lead who is not one of your engineers — so quality or fit conversations have a clear path.

  • NDA & background checks

    Mutual NDAs before any engineer touches your codebase, background-verified profiles on request.

Common questions

What teams ask a React Native mobile app development company

  • When is React Native the wrong choice?

    When the app is built around heavy real-time graphics, deep platform-specific UX, or sustained high-frequency native work. We will tell you up front and recommend native or a hybrid split instead of forcing cross-platform onto a job it does not fit.

  • Can you add React Native to our existing native app?

    Yes. We integrate React Native into an existing iOS or Android codebase so you adopt it screen by screen. You keep shipping while the shared layer grows, rather than betting on a full rewrite.

  • Do you provide a dedicated team or individual engineers?

    Both. You can engage a full dedicated team that owns delivery, or augment your in-house team with senior React Native engineers who work in your time zone and your process.

  • What makes EonTech a React Native mobile app development company rather than a generic outsourcer?

    React Native is a permanent practice at EonTech, not a bench label. Our engineers ship real production apps to both stores every month, our senior leads have written the native modules that survive iOS/Android SDK upgrades, and we make an honest cross-platform-vs-native recommendation before you sign anything.

  • Is a reactnative mobile app development company the right pick for a fintech or healthtech build?

    For most fintech and healthtech products, yes — the UI is forms, lists, and controlled flows where a well-built React Native app is indistinguishable from native. As a reactnative mobile app development company inside the EU, we deliver these under GDPR and with the biometric, secure-storage, and audit-logging patterns regulated buyers expect.

  • What React Native architecture do you follow?

    TypeScript across the app, React Navigation, a state layer picked to fit the app (React Query, Zustand, or Redux Toolkit depending on the shape), a design system with tokens, and Reanimated for motion. New Architecture (Fabric + TurboModules) where the app benefits, opted in per module rather than as a blanket upgrade.

  • Do you use Expo?

    Where it earns its place — for greenfield apps that do not need custom native modules, Expo's managed workflow shortens the first 8-12 weeks meaningfully. We move to a bare workflow (or bridge to native) when the app needs it, and we make the call once with you rather than as a mid-project surprise.

  • How do you handle App Store and Play Store submissions?

    We set up CI-driven builds, signing, and staged submission from the first sprint. We also handle App Store Connect, Play Console configuration, review responses, and staged rollouts. On the way out, we hand you signing keys and store-owner access so you are not dependent on us to ship.

  • How do you keep the app fast as it grows?

    Performance budgets on startup, list rendering, and animations, enforced in CI. Regular profiling on real devices (not just simulators), memoisation and list virtualisation as defaults, and Hermes tuning. If a hot path warrants it, we drop to a native module for that surface alone.

  • What contract shapes do you support?

    Fixed-scope first phase (four to eight weeks), then time-and-materials or a dedicated pod. Monthly rolling, no multi-year lock-in, no early-termination penalty on standard terms.

  • Which mobile OS versions do you target?

    By default we target the two most recent major versions of iOS and Android, which covers roughly 95%+ of live devices. We extend the range explicitly when the audience needs it, and we document the trade-offs so the choice is a business decision, not a hidden default.

  • How do you handle push, deep links, and in-app messaging?

    APNs on iOS and FCM on Android, integrated behind a single abstraction so features do not care which platform they run on. Universal Links, App Links, and dynamic-link fallbacks configured with a repeatable playbook. In-app messaging via the tool of your choice (Iterable, Braze, OneSignal, etc.) rather than a vendor we impose.

Ship to both stores with one team

Tell us what your app needs to do. We will give you a straight read on whether React Native fits, then scope a first milestone you can hold us to.

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