04 / 08 — Services

Mobile Apps

In short

We build apps for iOS and Android — native when performance and platform access matter, cross-platform with Flutter or React Native when one codebase should serve both worlds. That includes offline capability, background services, maps, real-time features and, if desired, on-device AI.

01

How it works.

The typical data flow — from input to result. Every station is replaceable and adapted to your systems.

  1. 01Design & prototype
  2. 02App (iOS/Android)
  3. 03Offline storage
  4. 04Sync API
  5. 05Store release
Hands using a mobile app on a smartphone
Finger tapping a smartphone display

02

What we deliver

Native and cross-platform apps for iOS and Android — from Swift to Flutter.

  1. 01Native iOS apps with Swift and Objective-C
  2. 02Native Android apps with Kotlin and Java, including Android services
  3. 03Cross-platform with Flutter (Dart) and React Native
  4. 04Clean architecture: Dagger2, RxJava, Retrofit, Room, GreenDAO
  5. 05Maps and location with Google Maps APIs
  6. 06Store publishing, updates and crash analysis

03

A look at the code.

This is what an excerpt from a typical project looks like — readable, commented and without magic. That is exactly how we hand code over to your team.

SwiftObjective-CKotlinJavaFlutterDart
AuftragScreen.ktExample
@Composable
fun AuftragScreen(vm: AuftragViewModel = hiltViewModel()) {
    val auftrag by vm.auftrag.collectAsState()
    Column(Modifier.padding(16.dp)) {
        Text(auftrag.kunde, style = MaterialTheme.typography.titleLarge)
        FotoListe(auftrag.fotos, onAdd = vm::fotoAufnehmen)
        Unterschrift(onDone = vm::abschliessen)      // offline gespeichert
        if (!vm.online) Hinweis("Wird synchronisiert, sobald Netz da ist")
    }
}

04

What you get out of it.

01

Native or cross-platform

Technology follows requirements, not the other way round.

02

Offline first

Work without signal, sync in the background.

03

Fast & smooth

Clean architecture and measurable performance.

04

Store support

Publishing, updates and crash analysis.

05

Typical scenarios

SwiftObjective-CKotlinJavaFlutterDartReact NativeRoomRetrofitRxJavaDagger2SQLite

04.1

Field service app

Capture jobs, forms and photos offline — sync as soon as the network is back.

04.2

Customer app

Ordering, status and support in the pocket, with push notifications.

04.3

Tracking & maps

Live position, routes and geofencing with Google Maps.

04.4

On-device AI

Text recognition, image classification or an assistant — even without a connection.

06

Matching solutions.

S3 Historic telephone switchboard — today VoIP and Asterisk

AI phone assistant

An Asterisk system with speech recognition and a language model: capture requests, answer standard questions, summarise, route.

  • No call without a note
  • Prioritised call-backs
  • Seamless hand-over to staff
S4 Hands using a mobile app on a smartphone

Offline-capable field-service app

A native or Flutter app with offline database, photo documentation, signatures and sync as soon as there is signal.

  • Report done on site
  • No lost photos
  • Data straight to the back office

07

Frequently asked questions

Native app or Flutter?

Flutter or React Native are ideal when both platforms should be served on one budget. Native pays off for heavy hardware use, complex background services or maximum performance. We master both and recommend based on requirements.

Do you take over existing apps?

Yes, including older codebases in Objective-C or Java. We assess the state and modernise step by step without interrupting operations.

Do you handle the App Store and Google Play?

Yes — from accounts and certificates to store listings, the review process and updates.

More services

01 / 08

AI Agents & RAG

LLM applications that work with your data and complete tasks on their own.
02 / 08

Local AI Models

Language models on your own hardware — data-sovereign, no cloud dependency.
03 / 08

AI Automation

Business processes that run themselves — with intelligent assistants and integrations.

Back to overview

Ready when you are

Let’s talk.

Describe your project in a few sentences — you’ll get an honest assessment of feasibility, effort and the way forward.

Discuss a project info@quell-code.com
E-Mail
info@quell-code.com
Phone
Call-back on request
Response time
usually 2 working days
Languages
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