EngineeringMobile App Development

We know mobile. We’ve changed how it’s built.

We combine years of mobile engineering experience with AI-driven development to build and improve iOS and Android apps. Native or cross-platform, chosen around your product.

The right approach for your app.

Selected around the experience, device capabilities, integrations and cost of maintaining your product.

  • NATIVE

    Built for
    each platform.

    Platform-specific experiences with direct access to device capabilities. Built with Swift and Kotlin.

    iOSSwiftSwiftUIUIKit
    AndroidKotlinJetpack Compose
    Explore native stack
  • CROSS-PLATFORM

    Share code.
    Keep flexibility.

    Share code across platforms where it makes sense, with native development where needed.

    React NativeFlutterKotlin Multiplatform Explore cross-platform
  • WEB

    An app experience.
    Through a browser.

    Progressive Web Apps when reach and easy access matter more than deep device integration.

    Progressive Web Apps Explore web apps
Our approach

From product decisions to release.

  1. 01

    Define

    Clarify the users, core journeys and business goals. Choose the platform approach and scope the first release.

  2. 02

    Design

    Turn requirements into tested user flows, interface designs and a technical architecture.

  3. 03

    Build

    Use engineers and AI coding agents to implement features, integrate services and test real device behavior.

  4. 04

    Launch & improve

    Prepare store submissions, monitor crashes and performance, and improve the app through user feedback.

What you get

A working product. A maintainable codebase.

Your mobile application.
Core user journeys, backend integrations and platform capabilities built around your requirements.
Source code and documentation.
A structured codebase your team can understand, maintain and extend.
Testing and release tooling.
Automated checks, device testing and repeatable build and submission workflows.
Support after launch.
Monitoring, OS compatibility updates and ongoing product development.
Why Cleevio

Mobile experience. AI throughout development.

We’ve been building products since 2008. We combine that experience with AI across planning, coding, testing and review.

On selected projects, AI generates the entire application codebase. Our engineers define the architecture, review the implementation and validate the app before release.

  1. 01Define the workClear requirements, architecture and acceptance criteria.
  2. 02Generate & integrateAI coding agents implement scoped tasks with engineering guidance.
  3. 03Review & testEngineers check the code, integrations and real device behavior.
  4. 04ReleaseValidated builds, store submissions and production monitoring.

We use structured workflows such as BMAD to carry requirements and architectural decisions into implementation.

Our stack

Selected for the product.

Native, shared or browser-based. Open each stack for architecture, integrations, testing and delivery tools.

Native iOSSwiftSwiftUIUIKit

Swift, SwiftUI and UIKit for new applications and existing codebases.

UI
SwiftUI, UIKit, SnapKit
Architecture
MVVM-C, The Composable Architecture
Concurrency & reactive programming
Swift Concurrency, Combine
Networking
OpenAPI code generation, URLSession, Alamofire
Image loading
Kingfisher, Nuke
Persistence & credentials
Core Data, Keychain
Monitoring & logging
Sentry, Firebase Crashlytics, Forestry, SwiftyBeaver, OSLog
Code quality & delivery
swift-format, Danger, fastlane
Native AndroidKotlinJetpack Compose

Kotlin and Jetpack Compose, with clear architecture and automated quality checks.

Language & UI
Kotlin, Jetpack Compose
Architecture & dependency injection
Clean Architecture, ViewModel, Hilt
Concurrency & reactive programming
Coroutines, Flow
Networking & serialization
Ktor, OkHttp, Moshi, OpenAPI
Code quality & architecture checks
Detekt, Danger, ArchUnit
UI testing & component tooling
Maestro, Showkase, Paparazzi
Monitoring
Sentry, Firebase Crashlytics
Cross-platformReact NativeKotlin MultiplatformFlutter
React NativeShared application code with native platform integrations.
Kotlin MultiplatformShared business logic with the flexibility to retain native interfaces.
FlutterShared UI and application code across iOS and Android.
Progressive Web AppsProgressive Web Apps

Browser-based applications with installation and offline capabilities where supported.

From makers to makers
Sales & AI Advisory

Start with Jakub.

Bring a business problem, a process or an idea.
We’ll help you find the right next step.

A short intro call is often the fastest way
to see what’s worth pursuing.

Jakub Durec
Jakub DurecAI Advisory Lead
Awards & recognition

Built to stand out.

GDPR compliantZero data retention
Clutch Global Fall 2023Clutch Global Spring 2024Clutch Global Fall 2024Clutch Top Web3 Development — Czech Republic 2024
Deloitte Technology Fast 50 — 2023 Central EuropeDeloitte Technology Fast 50 — Czech RepublicDeloitte Technology Fast 500 — 2023 EMEA

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