Service · Core Engineering

Mobile App Development for Products, Operations, and Customer Experiences

We build mobile applications for iOS and Android using production-ready architecture, thoughtful UX, secure APIs, push notifications, and scalable backend systems.

The app and the backend that feeds it — not a shell over someone else's API.

Native shellOffline statePush & deep linksStore releaseMOBILE APPSone senior team, end to end
The problem

Problems this service solves.

  1. 01Teams or customers need access to key workflows on mobile
  2. 02Web-only product is losing users who prefer a native app experience
  3. 03Existing mobile app is hard to maintain or missing key platform features
  4. 04Field teams need offline access to data or tools
What you get

Concrete deliverables, not activities.

  • iOS and Android apps
  • React Native cross-platform builds
  • Customer-facing mobile apps
  • Internal team and operations apps
  • Booking and appointment apps
  • Push notification systems
  • Offline-first workflows
  • API integration and backend connection
  • App Store and Google Play submission
The stack

What this is built on.

  • React Native
  • Swift / SwiftUI
  • Kotlin
  • Firebase
  • Fastlane

Built for these teams

Startups and product teams launching a mobile product · Businesses adding a mobile layer to an existing platform · Real estate, logistics, or service teams that need a field operations app · Companies replacing a slow or outdated native app

Typical engagement

How the weeks run.

WEEK 1

App use-case, user flow, and platform scope

What the app is for on a phone specifically — offline, notifications, camera, location — and what belongs on the web instead.

WEEK 2

UX wireframes, component library, and technical architecture

Screens, states and the API contract the app depends on, so the backend and the client can be built in parallel.

WEEKS 3–N

iOS/Android build, API integration, and QA

Both platforms built against the same contract, on real devices, with crash reporting from the first build.

FINAL WEEK

App store submission, monitoring, and handover

Store submission, release monitoring, and the credentials and certificates handed to your team.

Proof

Work in this area.

Platform SupportLong-term client work

First-Aid-Kit Subscription, Audit, Stock, and Compliance Platform

A cloud-based first-aid-kit management platform for audits, stock tracking, expiry reminders, replacement ordering, subscription workflows, and compliance operations.

Upwork client feedback
Recommended for clever, fast, and high-quality work — everything was done efficiently.
Upwork client feedback
Why Zasya for Mobile App Development

What makes us different.

Both platforms, one team

We ship iOS and Android from a single codebase without compromising on native feel.

API-first architecture

We build mobile apps that connect to your existing backend, not a separate silo.

Post-launch support

We handle app store updates, OS compatibility, and crash monitoring after launch.

Mobile App Development — FAQ

Questions we hear every time.

Should I build native or cross-platform?
For most business apps, cross-platform means one codebase instead of two, and performance a user cannot tell apart. We recommend native only for heavy device-specific features.
How do you handle app store submissions?
We manage the entire submission process for both App Store and Google Play.
Can you build an app that works offline?
Yes. Offline-first architecture with sync-on-connect is a standard pattern we use for logistics and field operations apps.

Start a conversation

Discuss your mobile app.

Bring the product idea or the app you already ship. We'll be direct about what needs native, what a cross-platform build covers, and what the backend has to do first.

Book a value call All services30 min · free · no commitment