What Does an App Developer Do and How Do You Choose One?

Updated

An app developer builds, tests, and maintains software that runs on mobile devices or other app platforms. That covers everything from a native iOS app written in Swift to a cross-platform build in Flutter. If you're hiring, the practical question is which type of app developer fits your project — native, cross-platform, or hybrid — and whether their portfolio and process match the platform you're targeting. If you're considering becoming one, the same distinction shapes which skills and tools you learn first.

What an app developer actually does

The role overlaps with web development and design, but the deliverables and constraints differ.

  • App developer — writes the application logic, integrates APIs and device features (camera, notifications, offline storage), handles app store submission, and ships updates.
  • Web developer — builds sites and web apps that run in a browser; the delivery target is a URL, not an installed binary.
  • Designer (UI/UX) — defines layout, interaction, and flow. On small teams one person may cover design and development; on larger teams these are separate roles.

A single app developer's day can include writing feature code, debugging device-specific issues, reviewing crash reports, and preparing a release build. The work is closer to product engineering than to static page building, because apps ship as versioned binaries that users install and update.

Native vs cross-platform vs hybrid

This is the decision that most affects cost, timeline, and who you hire.

Approach Typical languages/tools Strengths Trade-offs
Native iOS Swift (Apple tooling) Best performance and platform fidelity Separate codebase for Android
Native Android Kotlin (or Java) Full access to Android APIs Separate codebase for iOS
Cross-platform React Native, Flutter One codebase for both platforms Some native modules still need platform code
Hybrid Web tech wrapped in a native shell Reuses web skills Performance and native-feel limits

Bean Creative lists iOS, Android, and HTML5 among its capabilities, alongside web design, web development, and UI/UX — a mix that reflects how agencies often combine native mobile work with web and interactive projects rather than specializing in one stack.

How to choose: pick native when you need maximum performance or deep device integration; pick cross-platform when you want one team and one codebase across iOS and Android; pick hybrid when you already have a web app and need a lightweight packaged version.

Skills and tools to look for

A capable app developer typically shows evidence of:

  • Platform languages — Swift for iOS, Kotlin for Android, or JavaScript/Dart for cross-platform frameworks.
  • Framework experience — React Native or Flutter for shared codebases.
  • Backend and API integration — connecting the app to servers, authentication, and data storage.
  • UI/UX awareness — respecting platform conventions so the app feels native, not ported.
  • Release and maintenance — app store submission, versioning, and post-launch updates.

For a web-adjacent project, also check for CMS experience: Bean Creative lists Drupal and WordPress, which matters if your app needs to pull content from an existing site.

How to evaluate an app developer or agency

Use the same dimensions for freelancers and agencies:

  1. Portfolio relevance — have they shipped apps on your target platform, not just websites?
  2. Platform expertise — do they work natively, cross-platform, or both? Ask which they'd recommend for your case and why.
  3. Process — how do they move from concept to launch? Look for discovery, design, build, test, and release stages.
  4. Maintenance terms — who handles OS updates and bug fixes after launch?
  5. Client fit — Bean Creative, for example, describes its focus as education, non-profit, entertainment, association, and corporate clients since 1997. A studio with that profile may suit mission-driven or content-heavy projects better than a pure consumer-app shop.

Ask for a walkthrough of one past project: what the brief was, what they built, and what they'd do differently. Specifics here reveal more than a list of logos.

Typical steps in an app project

  1. Concept and scope — define the problem, target users, and must-have features.
  2. Platform decision — choose native, cross-platform, or hybrid based on the comparison above.
  3. Design — wireframes and UI/UX flows before code.
  4. Development — build features, integrate APIs, and test on real devices.
  5. QA and release — fix device-specific bugs, then submit to the App Store and/or Google Play.
  6. Maintenance — update for new OS versions and iterate on feedback.

Each stage produces something you can review, so ask your developer what you'll see at the end of each one. If you're becoming a developer yourself, this sequence doubles as a learning roadmap: pick one platform, build a small app end to end, and ship it.