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iOS & Android NativeReact Native / FlutterBackend & API SystemsApp Store Optimization

Mobile App Development

We build native-quality iOS and Android applications using React Native and Flutter, backed by robust API systems and real-time infrastructure. Every app is engineered for performance, retention, and seamless App Store approval.

The Challenge

Why This Is Harder Than It Looks

Mobile development is a minefield of invisible complexity that catches even experienced teams off guard. The app that looks simple in your wireframes touches push notifications, background sync, offline storage, biometric auth, deep linking, in-app purchases, and platform-specific accessibility requirements — each one a separate engineering challenge with its own edge cases.

The framework decision alone can derail a project. Go native and you are maintaining two separate codebases with two separate teams, doubling your cost and halving your iteration speed. Choose the wrong cross-platform framework and you end up fighting it for platform-specific features, producing an app that feels subtly wrong on both iOS and Android.

Then there is the backend. Your mobile app is only as good as the API it talks to. Slow endpoints mean slow screens. Unreliable push notification delivery means missed engagement. Poor offline handling means lost data and frustrated users. Most mobile agencies treat the backend as someone else's problem, which means the integration seams between app and server become the weakest point in your product.

App Store submission adds another layer of risk. Apple and Google reject apps for metadata issues, privacy policy gaps, performance problems, and guideline violations that are invisible during development. A rejected submission can delay your launch by weeks and burn through your marketing runway.

The teams that ship successful mobile products are the ones that treat iOS, Android, and the backend as a single integrated system — not three separate projects stitched together at the end.

Our Approach

How Zulbera Delivers Differently

We build mobile products as integrated systems where the app, backend, and deployment pipeline are designed together from the start. Framework selection — React Native or Flutter — is driven by your product's specific needs, not by what is trending. Apps that need deep platform integration or complex animations get Flutter. Products where web and mobile share business logic get React Native with TypeScript.

Our backend APIs are purpose-built for mobile consumption: paginated endpoints that respect bandwidth constraints, push notification infrastructure that handles token rotation and delivery tracking, and real-time channels via WebSockets for features that demand instant updates. Offline-first architecture ensures your app works in elevators, airplanes, and rural areas — syncing gracefully when connectivity returns.

We run automated UI tests on real devices through CI, catching visual regressions and interaction bugs before they reach your users. App Store assets, metadata, and privacy declarations are prepared in parallel with development so submission is a same-day process, not a last-minute scramble.

Every app we ship includes analytics instrumentation, crash reporting, and performance monitoring so you have full visibility into how real users interact with your product from day one.

01

Product scope, platform priorities (iOS, Android, or both), and backend requirements

02

UI/UX design and interactive prototype; framework selection based on product needs

03

App and API development with shared codebase and CI for both stores

04

TestFlight and internal testing, store listings, and submission support

Capabilities

What We Build

Cross-Platform App Development

We build apps that feel native on both iOS and Android from a single codebase, using React Native or Flutter depending on your product's requirements. Our approach goes beyond shared UI — we share business logic, state management, API integration, and navigation while customizing platform-specific behaviors like haptic feedback, notification handling, and system integration. The result is an app that respects each platform's design language and interaction patterns while keeping your development cost and iteration speed at the single-codebase level. We structure code with clean architecture principles so your team can extend features without untangling spaghetti dependencies.

Backend & API Systems for Mobile

A mobile app without a reliable backend is a beautiful shell with nothing inside. We build Node.js APIs with TypeScript that are optimized for mobile consumption — compact JSON responses, efficient pagination, and image delivery pipelines that serve the right resolution for each device. Authentication flows handle biometric login, social sign-in, and token refresh without forcing users to log in repeatedly. Push notification infrastructure manages device tokens across platforms, handles delivery failures gracefully, and supports rich notifications with images and action buttons. Real-time features are powered by WebSocket connections with automatic reconnection and offline message queuing.

Offline-First Architecture

Users do not stop using your app when they lose signal. We implement offline-first patterns that cache critical data locally, queue user actions for later sync, and resolve conflicts intelligently when connectivity returns. Local storage is encrypted for sensitive data and structured for fast retrieval so the app feels responsive regardless of network conditions. Sync logic handles the hard problems — merge conflicts, partial uploads, retry strategies — without exposing complexity to the user. This architecture is especially critical for field service apps, healthcare tools, and any product used in environments with unreliable connectivity.

App Store Optimization & Submission

Getting into the App Store is not just about passing review — it is about maximizing your visibility and conversion once you are there. We prepare store listings with keyword-optimized titles, compelling screenshots generated from real app states, and preview videos that demonstrate core value in seconds. Privacy nutrition labels and data handling declarations are documented during development, not scrambled together before submission. We handle TestFlight distribution for beta testing, staged rollouts for risk management, and the review process itself — responding to Apple and Google feedback with code changes and metadata updates until your app is approved and live.

Technology Stack
React NativeFlutterTypeScriptNode.jsPostgreSQLRedis
Investment

What to Expect

Engagements typically begin at €20,000 depending on scope and complexity.

Every project begins with a detailed scoping session to align on deliverables, timeline, and budget. We provide fixed-price proposals so there are no surprises.

Regions We Serve

Global Reach

Headquartered in Prishtina with distributed teams across Europe. We work with ambitious companies across:

EuropeUnited StatesCanadaUnited Arab Emirates
FAQ

Frequently Asked Questions

Should we build native or cross-platform?
For most products, cross-platform with React Native or Flutter delivers 90% of native performance at 50-60% of the cost. We recommend native development only when your app requires heavy use of platform-specific APIs like ARKit, custom camera pipelines, or complex Bluetooth integrations. We evaluate your specific feature requirements during discovery and give you an honest recommendation.
How do you handle different screen sizes and devices?
We design and develop with responsive layouts that adapt to every screen size, from iPhone SE to iPad Pro to Android tablets. Our testing pipeline runs on real devices across multiple OS versions, not just simulators. We use platform-specific design tokens so typography, spacing, and touch targets feel appropriate on each device class.
What happens if Apple or Google rejects our app?
Rejections are uncommon with our process because we address the most frequent rejection reasons — privacy declarations, performance issues, and guideline compliance — during development. If a rejection does occur, we handle the appeal or code changes directly and resubmit. Our experience with the review process means we typically resolve rejections within a few days.
Can you integrate with our existing backend?
Yes. If you have an existing API, we build the mobile app to consume it directly. We will audit your API for mobile-readiness — response sizes, pagination, authentication flow, and real-time capabilities — and recommend targeted improvements where needed. If your backend needs significant changes, we can handle those in parallel with app development.
How do you handle app updates after launch?
We set up over-the-air update capabilities for JavaScript bundle changes, which lets us push bug fixes and minor updates without going through the store review process. For native changes, our CI/CD pipeline automates the build, signing, and submission process so new versions can be submitted within hours of merging code.
What about push notifications and real-time features?
We implement push notifications through Firebase Cloud Messaging for Android and APNs for iOS, with a unified backend service that handles token management, delivery tracking, and rich notification formatting. Real-time features use WebSocket connections with automatic reconnection and offline queuing so users never miss an update.
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Avg. 2h response 120+ projects shipped Based in EU

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