Mobile App Development

iOS and Android apps users love, built without cutting corners on craft.

Mobile App DevelopmentReact NativeiOSAndroid
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Hardihood House
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Mobile app development means building software people use on phones every day. The difference between a good app and a great one is polish: gesture feel, timing, responsiveness, and architecture that keeps working after launch. At Hardihood, we build with React Native so one product can ship native-quality experiences on iOS and Android.

Phones are an unforgiving place to ship software. Users judge an app in the first few seconds, the app stores sit between you and your own release, and a crash rate that would be tolerable on the web becomes a one-star review. Most of the craft in mobile work goes into things nobody lists on a requirements document.

What we build

We build mobile apps people return to. Typical engagements:

  • iOS and Android apps

    Native-quality experiences from one React Native codebase, tuned for each platform where it matters.

  • Product-ready mobile flows

    Onboarding, core jobs-to-be-done, offline-friendly paths, and push-aware journeys.

  • Shared design and engineering systems

    Reusable components and patterns so the app stays coherent as features expand.

  • Store-ready releases

    Build pipelines, review prep, and launch support for App Store and Google Play.

What teams hire us to build

Mobile engagements tend to fall into a handful of shapes, including one where the answer is not an app.

  • MVP for a new product

    A focused first version on iOS and Android that is good enough to put in front of real users and learn from, without a year of runway.

  • Companion app to a web product

    Extending an existing product onto phones, sharing the same backend and design language rather than forking the product in two.

  • Field and operations apps

    Tools for people working away from a desk, where connectivity is unreliable and the interface has to survive one-handed use.

  • Marketplace and transactional apps

    Apps with payments, identity, notifications, and the trust requirements that come with handling someone's money.

  • Rescuing a stalled app

    Upgrading an outdated React Native or Expo version, resolving dependency drift, cutting crash rates, and making releases routine again.

  • Mobile web instead of an app

    Sometimes the right answer is no app at all. When users arrive by scanning a code, a download is a wall.

How we approach mobile app development

Mobile success comes from product judgment and detail work. We obsess over both, not just shipping screens.

  1. 1

    Define the mobile job

    Clarify who the app is for, which flows matter first, and what “done” looks like on a phone.

  2. 2

    Shape navigation and architecture

    Plan screens, state, and API needs so the app stays fast and understandable.

  3. 3

    Build the core experience

    Implement the highest-value flows with polish on gesture, timing, and responsiveness.

  4. 4

    Test across devices

    Validate real-world conditions: different phones, network quality, and permission states.

  5. 5

    Ship and support

    Release through the stores, then improve based on usage, crashes, and product feedback.

What a mobile app costs and how long it takes

Every engagement includes both platforms, store submission, and a release pipeline your team can operate after we leave.

EngagementTypical timelineWhat it covers
Mobile MVP6 to 10 weeksA tightly scoped first release on both platforms, with store submission and a release pipeline your team can run.
Full app build9 to 16 weeksA complete product including backend integration, payments or auth as needed, push notifications, and both store launches.
Takeover and stabilization2 to 6 weeksInheriting an existing codebase, upgrading dependencies, fixing crashes, and getting shipping back to normal.

What moves the number

  • Screen count, and how many of those screens have genuinely different states rather than different content
  • Whether offline support is required, which changes data architecture rather than adding a feature
  • Device capabilities in scope, such as camera, background location, biometrics, or payments
  • Whether the backend already exists and how well its APIs suit a mobile client
  • App Store and Play Store review requirements, which are stricter for some categories than others

Building on one shared codebase is the main reason these numbers are what they are. Maintaining two separate native apps roughly doubles the ongoing cost, which is a decision worth making deliberately.

React Native vs. fully native apps

Teams often ask us whether to go fully native or share a codebase. The difference changes speed, team shape, and how deep the platform-specific experience needs to go.

Fully nativeReact Native
CodebaseSeparate iOS and Android appsShared product code with platform-specific escapes
Speed to shipSlower for two platformsFaster when one team owns both releases
Platform depthMaximum OS-specific controlExcellent for most products; native modules when needed
Best fitDeep platform-only experiencesProduct apps that need quality on both stores

Bottom line: choose fully native when the platform is the product. Choose React Native when the product needs to ship well on both.

Our mobile stack

We build with React Native and Expo in TypeScript. Expo handles the build and release machinery that otherwise consumes a surprising share of a mobile project, and it makes over-the-air updates practical, so a fix does not always have to wait on app review.

When a feature genuinely needs platform-specific capability, we write a native module for that feature rather than abandoning the shared codebase. That is the whole trade: one product team, one set of business logic, native code only where it earns its place.

What actually makes an app feel native

Users cannot usually tell you why an app feels cheap, but they feel it immediately. It comes down to a short list: gestures that track your finger instead of animating after it, transitions that respect platform conventions, lists that stay smooth while scrolling through thousands of rows, and taps that acknowledge themselves instantly even when the network is slow.

That last one matters most. An interface that responds immediately and reconciles with the server afterward feels fast even on a bad connection. An interface that waits for a round trip before acknowledging a tap feels broken even on a good one.

Shipping, and everything after

Launch is the start of the work. Apps need a release pipeline your team can run without us, crash reporting that surfaces problems before reviews do, and a plan for the OS updates that arrive every year whether or not you were ready. We set up store accounts and signing credentials in your name from day one, so there is nothing to untangle later.

Why teams hire Hardihood for mobile development

We treat mobile as a product surface, not a thin wrapper around an API. Design, engineering, and release discipline stay together so the app feels intentional after it leaves the simulator, including the store prep and polish work that turns a build into something people keep opening.

If you're exploring how we partner, see engagement models, browse client work, or read more in our FAQ.

Frequently asked questions

We typically use React Native so teams can move faster with one shared codebase. When a feature truly needs platform-specific work, we add native modules without abandoning the shared product foundation.

Proof: apps we have shipped

Hungry Monster came to us needing a high-quality MVP across web, iOS, and Android. We delivered all three from one product foundation using React Native, Expo, Next.js, TypeScript, and Elixir. Boycottr was a similar shape: a React Native app on a Ruby on Rails API, built from nothing to a monetizable launch.

Platforms from one codebase
3

Platforms from one codebase

App stores at launch
2

App stores at launch

Typical weeks to ship
9-16

Typical weeks to ship

Justin and team have contributed extremely high quality code with very fast deployment cycles, leading to a successful MVP launch. We're thrilled to have found Hardihood and highly recommend them.
Founder of Hungry Monster
Read the Hungry Monster case study

Related services

  • Backend development

    The APIs, auth, and push infrastructure behind the app.

  • Product design

    Native patterns, gesture feel, and the details that separate polished from serviceable.

  • Product strategy

    Worth confirming you need an app at all before committing to two app stores.

Related reading

Building a mobile app? Let’s talk scope and stack.

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