App Developers for High-Performance & Scalable Mobile Apps

We build apps for iOS and Android that stay stable even with many users. We take you from the first idea through design and backend all the way to the app stores.

Louis Nell, Managing Director of KNGURU
  • App screen for Red Bull Salzburg
  • Scoops: recipes from food creators in the app
  • App with jobs and teams for tradespeople
  • App for booking e-shuttle rides
  • App for booking offices and rooms
  • Community app for dog owners with map and chat
  • App with bedtime stories
  • Augenzeuge: tips and messages in the app
  • Daycare app with attendance, schedule and chat
  • RadlScout: find and sell bikes
  • Funellab: website for recruiting through social media
  • Elaris: website for an electric car

What Our App Developers Can Do for You

  1. 01

    App Development for Android and iOS

    With React Native, your app is built from one codebase for both platforms. That saves time and money.

  2. 02

    Backend Development

    The backend stores your app's data securely and keeps it up to date on every device.

  3. 03

    Admin Interface

    You manage your app's content and data yourself, no technical knowledge needed.

How Our App Developers Work

  1. Concept and Prototype

    We plan the features and the user experience with you, matched to your brand and your audience. This turns into a clickable prototype.

  2. A First Version to Test

    Once the prototype is ready, we build a first version (MVP) with the core features. You test it, with outside test users too if you like.

  3. Launch and Marketing

    We get your app into the App Store and onto Google Play. If you want, we also handle the marketing afterwards so people find it.

These Technologies Are Used by Our App Developers

Back-end
FirebaseAWS
Front-end
React NativeFlutter
Management
DiscordNotionTrello
UX/UI Design
FigmaIllustratorAfter Effects

Built for clients. In use today.

A Gold Stevie Award, 200,000 festival visitors, 4.4 stars on Google Play. Eight of over 200 projects, all live, every screen real. Two more we can name but not show.

See all projects

Recognized for design, user experience and digital innovation

Nine out of twelve reviews say the same thing: we push back when something won't work for users.

  • OMR Reviews Proud Partner 2026: UX Agencies
  • OMR Reviews Proud Partner 2026: App Development Agencies
  • German Stevie Awards 2026: Gold for PetPlanner

FAQ

What are the responsibilities of an app developer?

From the first idea through design and coding to testing, an app developer makes sure the app runs well on iOS and Android and is easy to use. With us, that also includes the backend and publishing to the app stores.

How do you choose the developers for a project?

We look for experience with similar projects and with the technology your app needs. Besides React Native and Flutter, our team also works with Swift, Kotlin and Java.

Why is it so difficult to find qualified app developers?

The market is competitive, and an app needs many skills: iOS, Android, backend and a feel for users. That mix rarely comes in one person. With an agency, you get the whole team without hiring anyone.

How much does it cost to hire an app developer?

It mostly depends on the features, plus design, backend and support after launch. After the first call, you get a quote that lets you plan the costs realistically.

Book your free call.

We look at your plans with you as if they were our own. If the build isn't worth it, we'll tell you, even if that means no project.

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