Вадим

Vadym Kozlenko
Senior Flutter Developer
Kyiv, Ukraine
• [open contact info](look above in the "contact info" section)
• [open contact info](look above in the "contact info" section)
• [open contact info](look above in the "contact info" section)

PROFESSIONAL SUMMARY
Flutter Developer with 5+ years of commercial experience building and releasing cross-platform mobile applications
across FinTech, IoT, e-commerce, education, and AI-assisted products. Experienced in owning features end-to-end,
from architecture and implementation to native iOS/Android integrations, production debugging, and store releases.
Strong background in Flutter architecture, FinTech integrations, digital wallet provisioning, secure authentication,
REST APIs, Firebase, and native development with Kotlin and Swift.

KEY HIGHLIGHTS
• 5+ years of Flutter/Dart development experience
• Production FinTech experience with payment cards, tokenization and wallet provisioning
• Native integrations with Kotlin, Swift, Android SDK, iOS SDK, Gradle and Xcode
• Google Wallet API, Apple Wallet / PassKit, Push Provisioning, MethodChannel
• Security-focused mobile development: biometrics, secure session handling, app hardening
• Built and launched a cross-platform product from scratch, covering architecture, development, monetization, analytics,
and store releases

CORE SKILLS
Languages Flutter
Dart, Kotlin, Swift, Java Flutter SDK, Bloc, Cubit, Flutter Hooks,
Navigation, Localization
Architecture Integrations
Clean Architecture, Feature-first, MVVM, DI, REST APIs, JSON, Firebase, RevenueCat,
Repository Pattern Google Wallet, Apple Wallet, Pomelo Pay
Tools Process
Git, GitHub, GitLab, Bitbucket, Android Studio, Agile, Jira, Trello, YouTrack, distributed teams,
Xcode, Gradle, Figma, Postman release management

AI & MODERN MOBILE DEVELOPMENT
Practical experience using AI-assisted development tools throughout the software development lifecycle, including
architecture exploration, implementation, debugging, documentation, code review, refactoring, and feature planning.
Comfortable working with AI-focused products and evaluating AI-assisted functionality from both engineering and
product perspectives.
EDUCATION
National University of Life and Environmental Sciences of Ukraine - Computer Science, Bachelor
LANGUAGES
English - Upper-Intermediate · Ukrainian - Native

PROFESSIONAL EXPERIENCE
KnubiSoft - Flutter Developer
Sep 2024 - J une 2026 · Kyiv, Ukraine · Hybrid
Project: Bink Card - digital wallet for managing employee benefits, payment cards and benefit pockets.
• Developed and maintained cross-platform mobile features using Flutter and Dart.
• Implemented state management with Bloc, Cubit and Flutter Hooks.
• Integrated Google Wallet API: TapAndPay, Push Provisioning and tokenization flows.
• Integrated Apple Wallet / PassKit provisioning flows for iOS.
• Built native Android and iOS modules in Kotlin and Swift using MethodChannel.
• Integrated Pomelo Pay API for secure card tokenization and provisioning.
• Worked with authentication, biometrics, deep links, push notifications and secure session handling.
• Prepared, debugged and supported Android and iOS production builds using Gradle and Xcode.
Technologies: Flutter, Dart, BLoC/Cubit, Flutter Hooks, Clean Architecture, MVVM, REST API, Dio, Firebase,
FCM, Deep Links, go_router, Hive, Secure Storage, MethodChannel / Platform Channels, Swift, Kotlin, Apple
Wallet, Google Wallet, Flutter DevTools, Sentry, Git

BullViability - Founder & Flutter Developer
Personal product · 2025 - Present
Cross-platform crypto portfolio and exit-planning application for structured position management, ROI
scenarios, sell levels and local-first portfolio tracking.
• Designed and developed the application from scratch, including architecture, UI, storage and release
flow.
• Implemented local-first token portfolio management, exit-plan calculations and realized P&L tracking.
• Integrated RevenueCat subscriptions and app-level monetization flow.
• Integrated market data through REST APIs / CoinMarketCap API.
• Implemented multilingual support, app settings, import/export logic and Google Play release flow.
• Prepared iOS release assets, privacy pages and App Store submission flow.
Technologies: Flutter, Dart, Bloc/Cubit, Hive, Dio, Firebase, RevenueCat, REST APIs, CoinMarketCap
API, Google Play Console, App Store Connect, Git

Avirise - Flutter Developer
Apr 2024 - Aug 2024
NDA mobile project. Responsible for the front-end part of the application and release preparation.
• Set up Flutter project structure and application architecture.
• Developed front-end features and UI screens.
• Implemented localization and navigation flows.
• Prepared Android and iOS builds for store submission.
Technologies: Flutter, Dart, Bloc, Injector, Localization, Android SDK, MVVM, Navigation, Firebase,
Melos

Otto Wilde - Flutter Developer
Dec 2021 - Jan 2024
Mobile application for grill control, recipes, timers, temperature control and device communication via
Bluetooth / Wi-Fi hotspot.
• Developed new Flutter features and UI for Android and iOS.
• Optimized the application for tablet layouts and future Apple Watch support.
• Implemented navigation flows and improved existing screens.
• Worked with Bluetooth / Wi-Fi-related user flows and device-control scenarios.
• Analyzed requirements, improved UX and fixed production bugs.
• Collaborated with a distributed team of developers, designers and QA
engineers.
Technologies: Flutter, Dart, Bloc, MobX, Swift, Node.js, React, Android Studio, Xcode

Clasee - Trainee Flutter Developer
Sep 2021 - Dec 2021
Knowledge-sharing platform for personalized lifelong learning with short-form educational content.
• Developed new features and supported existing functionality.
• Implemented UI screens according to design requirements.
• Worked with Cubit-based state management.
• Participated in code review and team development process.
Technologies: Flutter SDK, Dart, Cubit, Firebase, AWS Cognito, Android Studio

Temy Coffee Shop - Trainee Flutter Developer
Jul 2021 - Sep 2021
Sample e-commerce mobile application for coffee ordering.
• Developed new Flutter UI screens and features.
• Analyzed requirements and implemented application flows.
• Worked with Firebase, localization and navigation components.
Technologies: Flutter SDK, Dart, Bloc, Injector, Localization, Firebase, Android SDK, MVVM,
Navigation Component