Hakan Sevimoğlu Hakan SevimoğluFreelance Developer · 18 yrs
Kotlin & Compose

Android App Development: Kotlin Apps Built for Real-World Use

I build high-performance Android apps in Kotlin for phones, tablets and industrial handheld terminals.

Quick answerAndroid app development is the process of building apps for Android phones, tablets and handheld terminals with Kotlin and Jetpack Compose, and publishing them on Google Play. Hakan Sevimoğlu is experienced in Android projects involving barcode-based stock counting, camera-based analysis and hardware integration.

Written by Hakan Sevimoğlu · Last updated:

Industrial and consumer Android apps

I build apps that run on handheld terminals with barcode scanners for scenarios such as warehouse stock counts, field service and shipping, and on the consumer side, apps with maps, payments and notifications.

Apps are designed with a local database so they keep working without an internet connection and sync with the server once the connection is back.

What I offer

  • Kotlin & Compose

    Modern, easy-to-maintain Android architecture.

  • Handheld terminals & barcode

    Fast scanning and counting workflows on industrial devices.

  • Camera & ML

    Image analysis with MediaPipe / ML Kit.

  • Offline sync

    Local database and background synchronization.

  • Hardware

    Bluetooth, USB and printer integrations.

  • Google Play release

    Store listing, releases and testing tracks.

Technologies I use

KotlinJetpack ComposeRoomMediaPipeML KitOpenGL ESRetrofitFirebase

Official documentation and resources

Standards and official documentation I follow in projects:

Example projects

A selection of live projects serving real users.

How we work

  1. Free intro call

    We clarify needs, existing systems and goals together.

  2. Quote & roadmap

    Scope, technology, timeline and budget within 24 hours.

  3. Staged development

    Weekly demos and a live test environment.

  4. Launch & support

    Go-live, training and ongoing maintenance.

Free pre-analysisThe first meeting and roadmap are completely free, with no obligation.

Staged delivery and approvalYou review each module on a test environment before we move on.

Written scope and rightsScope, delivery and source code rights are defined in the contract.

Frequently asked questions

What determines the cost of an Android app?

The number of screens, backend requirements, hardware integrations and the variety of target devices determine the cost.

Do you build custom apps for handheld terminals?

Yes. I build stock counting, shipping and inventory apps for industrial Android devices with barcode scanners.

Can you build iOS and Android together?

Yes; both platforms are developed in parallel on the same backend and API.

Do you handle the Google Play release?

I manage the release side, including the store listing, screenshots, release management and the review process.

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