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Build · from idea to store

React Native app development, from idea to store

A squad of two to four seniors who have already worked together, over eight to sixteen weeks. Scoping, Expo architecture, design system, backend integrations, CI/CD, release on both stores, then handover to your team.

Short answer

useffect.sh React Native app development takes a mobile app from idea to release on the App Store and Google Play, with a squad of two to four senior engineers who already work together, over eight to sixteen weeks. It is for scale-ups, enterprises and innovation teams that want to launch a mobile product without hiring a team, and for startups that want a V1 fast enough to learn from and clean enough to grow on. The mission starts with five days of product and technical scoping, ending in a document of three pages at most: scope, architecture, risks, timeline. Then the squad builds the app on Expo and React Native, with a design system, backend integrations, native modules when needed, CI/CD and monitoring, through reviewed PRs and a demo every week. It ends with the store release and a handover, runbooks, ADRs and walkthroughs included, so your team carries on without us.

seniors in the squad
2–4
weeks, from idea to store
8–16
apps published on the stores
100+

01

When to call us

  • You have a product, not a mobile team.

    Hiring two senior React Native engineers takes months. The roadmap has a date.

  • The POC has to become a product.

    A prototype won people over, in Figma or generated by AI. Now it needs a base that holds real users and the next features.

  • The app has to talk to hardware or native code.

    BLE, camera, widgets, payment SDKs, notifications: Swift and Kotlin topics most JS teams avoid.

  • A web app exists, mobile has to join it.

    Screens, business rules and a design system to share between Next.js and Expo, in one monorepo.

  • Several brands, one product.

    White label, multi-country, multi-tenant: the configuration has to live in code and in the backend, not in forks.

02

How it runs

  1. 1 / Days 1–5

    Scoping

    Product goals, critical flows, backend and native constraints, architecture choices. A document of three pages max: scope, timeline, risks.

  2. 2 / Weeks 1–2

    Foundations

    Expo project, navigation, design system, CI/CD with builds on both platforms, a development build handed to your team, crash monitoring. A demo from the first week.

  3. 3 / Weeks 2–N

    Features, PR by PR

    Each flow shipped in reviewed PRs, tests on the critical flows, a demo every week, metrics on a shared dashboard. Native modules written when a library is not enough.

  4. 4 / Last weeks

    Stores and handover

    Store listings, Apple and Google review, phased release. Runbooks, ADRs, video walkthroughs, pairing with your engineers.

03

What you get

  • Scoping document, three pages max
  • iOS and Android app on Expo, released on both stores
  • Design system and documented components
  • Swift / Kotlin native modules when needed
  • CI/CD, builds and over-the-air updates
  • Crash and performance monitoring
  • Runbooks, ADRs and video walkthroughs

04

Comparable missions

05

Common questions

How much does React Native app development cost?

It depends on the scope: number of flows, platforms, whether a backend exists, native topics. The five-day scoping is there to cost it on evidence, with a timeline and named risks, before the first line of code.

Why Expo rather than bare React Native?

Expo generates the native projects from configuration, provides builds, over-the-air updates and store submission, and each SDK targets one React Native version. We add Swift or Kotlin in Expo Modules when needed. It is our default base for a new app.

Who is in the squad?

Members of the collective, seniors only, picked for the subject: native, BLE, animations, monorepo, design system. You talk directly to the people who write the code, and the rest of the collective reviews.

What if we already have a backend or a web team?

We plug into it. API integrations, authentication, and if you run Next.js, a monorepo to share screens and business rules between web and mobile.

What happens after release?

The handover: runbooks, ADRs, video walkthroughs and pairing with your engineers. Your team takes over. If you want to keep working with us, one expert on one specific topic is a possible format.

Do you use AI to build?

Yes, every day, and framed: a senior decides the architecture, our conventions are encoded in our skills, tests block, and every PR is reviewed by a human.

See also

Terms on this page

Updated October 26, 2026

An app to launch, a squad that already works together.

30 minutes with a senior to scope the project. Free, reply within 48 hours.

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