Костянтин

Konstantin Rezhets

Flutter Developer

Location: Kyiv, Ukraine / Remote

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PROFESSIONAL SUMMARY

Senior Flutter Developer with 9 years of mobile development experience, specializing in Flutter for the past 5
years. Experienced in building production mobile applications from the ground up, modernizing existing
codebases, and delivering features independently or within development teams. Skilled in designing scalable
architectures, integrating complex third-party services, and extending open-source libraries to meet
project-specific requirements. Leverages modern AI-assisted development tools to improve development speed
and maintain code quality.

TECH STACK

Development: Dart, Flutter, Android Studio, Cursor
Architecture & State Management: Clean Architecture, BLoC, Cubit, Provider, Injectable, GetIt
Libraries: Dio, HTTP, Firebase, GoRouter, RxDart, Google Maps, ObjectBox, Hive, Sockets, OAuth, Chewie,
Geolocator, Google ML Kit OCR, Retrofit, Rust Bridge, Web3Dart, Push Notifications
Tools: Git, Swagger, Postman, Figma, Jira, GitHub Actions, Lint, DevTools

EXPERIENCE & PROJECTS

Own MVP Project | Ulub Pet Finder 2026
Link: Demo Video
Designed and developed a Flutter MVP for pet adoption and lost/found listings from scratch. Implemented
real-time geolocation using Geolocator and Firestore streams, built a map-based location picker with automatic
GPS detection and manual marker placement, and applied AI-assisted development tools (Cursor) to accelerate
implementation and improve code quality.

Senior Flutter Developer | Bladeware 2024 – 2026
Led architecture design, core development, code reviews, and project scope estimation for multiple applications
within the company.

LogOOOI 2024 – 2026
Link: iOS
Architected a logbook app from scratch using Clean Architecture and BLoC. Developed an offline OCR scanning
engine via Google ML Kit and a custom coordinate-based grouping algorithm to parse cockpit screenshots into
structured datasets. Embedded a cross-platform Rust core library.

LockerReady 2025 – 2026
Links: iOS | Android
Contributed as part of the development team. Implemented new features and improvements for the existing
application. Conducted regular code reviews for sports motivation app.

Flutter Developer | UkrainskeTV 2024
Links: iOS | Android
Developed and shipped a comprehensive IPTV application from the ground up for live TV streaming.
Designed the entire app architecture, integrated and upgraded the Chewie package for responsive video
playback, Google Sign-In and Google/Apple in-app subscriptions for premium content management. Handled
multilingual localization and app stores distribution.

Flutter Developer | Bladeware 2021 – 2023

Viva Verve 2023
Built a health tracking app seamlessly integrating metrics from Dexcom, Oura, and Apple Health. Designed
interactive trend visualization charts via fl_chart.

Tim Socio 2021 – 2022
Developed the application, designed the core architecture for a dating platform, and implemented real-time
messaging via WebSockets, GPS-based matching, and secure local storage via Hive. Managed the engineering
team, task delegation, mentoring, and app stores publishing.

LifeLine 2021 – 2022
Link: Demo Video
Built a personal productivity timeline app with a custom multi-lane lifeline chart utilizing fl_chart, featuring pan
and zoom navigation, dynamic lane-splitting, and optimized touch hit-testing. Recently upgraded the legacy
project to modern Flutter.

Flutter Developer | LeadIT Team 2020 – 2021
Developed and maintained e-commerce, financial, and cryptocurrency mobile applications, implementing new
features and improving existing functionality.

Green List Marketplace 2021
Upgraded a cryptocurrency wallet app. Enhanced a custom web3dart library to handle secure digital asset
transfers and on-chain balance updates via third-party APIs.

Knip 2021
Refactored and maintained financial application modules, integrated banking APIs, and managed AWS and
Firebase infrastructure.

Region Product 2020 – 2021
Developed a local food delivery e-commerce app from scratch. Designed the app architecture, implemented
REST APIs, managed local caching with Hive, integrated deep links.

iOS Developer | TrioSoft & Invest.com 2016 – 2019
Engineered native iOS applications focusing on IOT and financial trading. Developed applications for smart
irrigation hardware Adi-Ble and smart fragrance appliances Moodo using Swift.
Maintained and extended features for two enterprise-grade real-time stock trading applications at Invest.com
using Swift and Objective-C. Managed app store distribution and bug fixing.

EDUCATION

Israeli Institute of Technology and Communication IITC 2014 – 2015
Advanced mobile development courses, 400 hours

Kharkiv National University of Radio Electronics 2008 – 2014
Engineer-Researcher of Multimedia Technologies, Master’s Degree

LANGUAGES
English: Upper-Intermediate | Ukrainian: Native