Іван

Ivan Yakoviv
Flutter & Kotlin Developer | Mobile Architecture & API Integration
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) · github.com/TheIvasyl
PROFESSIONAL SUMMARY
Mobile Developer with over 8 years of commercial experience, including 4+ years building production cross-platform applications with Flutter/Dart and 4+ years of native Android development with Kotlin/Java. Expert in REST API integration, offline-first data synchronisation, and state management using BLoC, Redux, and Clean Architecture. Proven track record delivering enterprise-grade mobile applications with complex business logic, local data storage, and asynchronous operations. Experienced in code review practices, Figma-driven UI implementation, and collaborative cross-functional teamwork with QA, backend developers, and business analysts.
HARD SKILLS
• Flutter & Dart: BLoC, Redux, Cubit, Custom Widgets, Navigator 2.0, Method Channels, Async Operations & Error Handling
• Kotlin & Android: Jetpack, Android SDK, Camera Integration, Native Interoperability, Multi-Flavour Builds
• Architecture & Design: Clean Architecture, SOLID, OOP, MVVM, MVC, MVP, Design Patterns, DRY, KISS
• Networking & APIs: REST API, WebSockets, Salesforce REST API, Firebase (FCM, Analytics, Crashlytics, Remote Config)
• Local Storage & Offline: SQLite, Hive, Shared Preferences, Offline-First Data Sync
• CI/CD & Releases: GitHub Actions, Google Play Console, App Store Connect, Git, Jira
• UI & Collaboration: Figma, Responsive Layouts, Adaptive Widgets, Code Review
PROFESSIONAL EXPERIENCE
Flutter Developer · ZutobiFeb 2024 – Present
EdTech platform for driver education — high-traffic, consumer-facing Flutter application for DMV permit test preparation.
• Architected core learning modules using BLoC and Redux state management to enhance user engagement and retention.
• Engineered cross-platform features on Flutter (iOS, Android, Web) with complex business logic and asynchronous operations.
• Automated CI/CD deployment workflows using GitHub Actions, significantly reducing release cycle overhead and build errors.
• Conducted systematic code reviews and mentored junior developers on Flutter best practices and Clean Code standards.
• Spearheaded A/B testing initiatives using Firebase to optimise conversion rates and revenue monetisation leading to 5-8% increase in conversion to trial and paid subscription.
Flutter Developer · CustomertimesJul 2021 – Jan 2024
Enterprise CRM for pharmaceutical sales — complex **offline-first data synchronisation** with Salesforce.
• Built a robust offline data connector with real-time sync to Salesforce OneKey databases, handling local storage and state management.
• Integrated Salesforce REST API for secure, efficient enterprise data exchange and asynchronous data processing.
• Refactored legacy UI into reusable adaptive widgets based on Figma mockups, increasing development velocity by 30%.
• Resolved complex platform-specific issues across iOS and Android to maintain feature parity and application stability.

Mobile Developer (Flutter/Android) · CustomertimesFeb 2020 – Mar 2021
Various projects both for Android and Cross-platform with Flutter.
• Developed custom Android libraries in Kotlin for optimised API communication with Salesforce backend services.
• Delivered a Loyalty Management B2C application MVP from inception using Flutter with BLoC.
• Implemented real-time geolocation tracking using Google Maps API and integrated third-party SDKs for HR management.
• Developed core functionality for offline-first CRM client application using Flutter and BLoC.
• Mentored trainee developers in Flutter and mobile development, delegated work on the project I architected.
Android Developer (Kotlin/Java) · CustomertimesSep 2019 – May 2021
Healthcare ecosystem applications focused on clinical nutrition and patient monitoring with native Android.
• Developed patient assessment tools using Android SDK, Kotlin, and Jetpack, integrating camera and barcode scanning functionality.
• Implemented secure synchronisation layers using the Salesforce SDK for healthcare data tracking and REST API integration.
• Modularised large-scale legacy codebases applying SOLID principles to improve maintainability and security standards.
Junior Android Developer · eTachki / anyCarsMar 2017 – Oct 2018
Real-time car auction platform with high-concurrency data processing.
• Developed a real-time car auction system using WebSockets for live bidding updates and asynchronous error handling.
• Architected a multi-flavour build system to support diverse market requirements in Ukraine and Poland.
• Collaborated with backend and QA teams to optimise API response times and ensure application stability.
EDUCATION
Master's Degree in Cybersecurity · National Aviation UniversitySep 2012 – Feb 2018
LANGUAGES
English: ** Full Professional Proficiency · Ukrainian: ** Native
WHY UKRPOSHTA — QUALIFICATION MATCH
My experience directly aligns with Ukrposhta's technical requirements for a Flutter + Kotlin developer:
✓ 8+ years of commercial mobile development — far exceeding the 2-year minimum requirement
✓ 4+ years of Flutter/Dart and 4+ years of Kotlin/Java — proven production expertise in both required technologies
✓ REST API integration and offline-first architecture — enterprise-grade data sync deployed across multiple projects
✓ Clean Architecture, SOLID, and OOP — consistently applied across high-scale codebases with strict code review standards
✓ Git, Jira, Figma, and cross-team collaboration — daily workflow with QA, backend developers, and business analysts
✓ Higher education in IT (Cybersecurity) — Master's degree from National Aviation University