Andreja Zubac

1. 2026 – 2026

   Flutter Engineer · BrainRocket

   Built a consumer mobile banking application in Flutter across Dev, Stage, UAT and Production environments.

   [+]Show 5 highlights

   • Built the complete post-sign-up onboarding journey: a 9-step compliance questionnaire, a country-gated waitlist path and resumable progress persisted to secure storage.
   • Integrated KYC identity verification with the backend webhook verdict as the source of truth, bounded status polling and recovery for error and still-pending states. Isolated the SDK behind an interface to ship ahead of the backend.
   • Implemented passwordless authentication with passkeys (WebAuthn), including Android signing, Digital Asset Links and per-environment configuration.
   • Delivered card management, SEPA, SWIFT and domestic transfers, and transaction history and statuses.
   • Contributed to app signing, RASP configuration, GitLab CI/CD and HashiCorp Vault secrets; authored Architecture Decision Records on security and release signing.

   • Flutter
   • Dart
   • BLoC / Cubit
   • Passkeys / WebAuthn
   • GitLab CI
   • HashiCorp Vault

2. 2025 – 2026Part-time

   Flutter Developer · POSSector

   Developed and maintained a Flutter point-of-sale application for hospitality across mobile and desktop.

   [+]Show 4 highlights

   • Worked on payments, receipt printing, bill splitting, order management and multi-device sync.
   • Integrated the Teya payment SDK on Android for in-app card payments.
   • Led a full refactoring: analysed the inherited architecture, decomposed oversized god classes and migrated the project to Clean Architecture without halting feature delivery.
   • Built a Python translation automation pipeline with Slack and Google Chat webhook integrations.

   • Flutter
   • Flutter desktop
   • BLoC / Cubit
   • Android
   • Teya SDK
   • Clean Architecture
   • Python

   • Read the case study

3. 2025 – 2026

   Flutter Engineer · Orion Innovation

   Built and scaled features for Command Pro, a Flutter app with millions of active users for managing cellular trail cameras and monitoring property and wildlife.

   [+]Show 3 highlights

   • Implemented BLE/IoT configuration flows for cameras, weather stations and feeders via Kotlin platform channels.
   • Engineered an image and video gallery with lazy loading, custom caching and fullscreen rendering, resolving frame drops in asset-heavy feeds.
   • Maintained the Codemagic CI/CD pipeline across a multi-module Flutter project, improving build stability.

   • Flutter
   • Dart
   • BLoC / Cubit
   • Kotlin
   • Platform channels
   • Bluetooth LE
   • Codemagic

   • Read the case study

4. 2024 – 2025

   Flutter Engineer · Rolla

   Built the Rolla One health and fitness app from the ground up through production release.

   [+]Show 4 highlights

   • Designed and implemented the BLE communication layer in Kotlin, exposed to Flutter via platform channels: scanning, connection management, reconnect logic, background operation and state recovery.
   • Integrated a heart-rate wristband, treadmill and bike sensors alongside GPS, parsing raw sensor data into a unified real-time activity stream.
   • Calculated calories and workout metrics from combined sensor and GPS data, with time-series charts for activity history.
   • Added multilingual support (EN, SR, RU) and handed over a stable, documented codebase.

   • Flutter
   • Dart
   • BLoC / Cubit
   • Kotlin
   • Bluetooth LE
   • Platform channels
   • GPS

   • Read the case study

5. 2022 – 2024

   Flutter / Android Engineer · Abstract

   Delivered multiple Flutter and Jetpack Compose projects end to end, from architecture design through App Store and Play Store release.

   [+]Show 5 highlights

   • Pošta Srbije: built a new Jetpack Compose app on the existing backend and brought in a separate XML-based transactions and wallet project through Compose–View interoperability. Also delivered biometric authentication and map clustering.
   • SOS za gluve: built the native Android video relay app (XML views, Retrofit, Dagger Hilt) for deaf and hard-of-hearing users, with live video calls to a sign language interpreter.
   • Rent A Garden: built the Rent A Garden mini-app in Flutter as part of a Smart City super app in Slovenia.
   • Cyber awareness course app (Flutter): authentication and security-awareness courses that teach people to recognise attacks, defend against them and behave safely online.
   • Applied Clean Architecture (DDD) across all projects, with BLoC/Cubit state management in Flutter. Set up Codemagic CI/CD and owned full release processes.

   • Flutter
   • BLoC / Cubit
   • Jetpack Compose
   • Kotlin
   • Clean Architecture
   • Codemagic

   • Pošta Srbije
   • SOS za gluve
   • Rent A Garden
   • Cyber Awareness Courses

6. 2019 – 2022

   Software Developer · Dib Travel

   Developed the Angular web booking platform for a business-travel product, then moved into native Android and Flutter development on its mobile app.

   [+]Show 2 highlights

   • Contributed to a full application redesign, migrating legacy Angular pages to a component-based architecture.
   • Mentored junior developers through code reviews and pair programming.

   • Angular
   • Android
   • Flutter

   • Read the case study

Have a role, a project or a technical question in mind? Email is the quickest way to reach me.

• Email
• GitHubandrejazubac (opens in a new tab)
• LinkedInandreja-zubac (opens in a new tab)
• CV · EnglishPDF
• CV · РусскийPDF
• Novi Sad, Serbia · Sochi, Russia