Олег

Oleg Tsiganov
Mobile Developer | Flutter, Dart, Xamarin/.NET, iOS & Android
Ukraine | Open to remote international opportunities
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PROFESSIONAL SUMMARY
Mobile developer with 12+ years on iOS and Android: last 3 years Flutter and 8+ years Xamarin/.NET in enterprise delivery at
Trinetix. Ships production apps end-to-end: feature work, Clean Architecture / BLoC, native MethodChannel plugins, offline cache,
Crashlytics-driven fixes, and CI/store releases.
Strongest recent work: core contributor on a Flutter utilization app (charts, planning rules, coach mode, production launch) and a
long-running campus app (architecture layers, crash/ANR reduction, unit-test campaign, platform upgrades). Experienced in
Xamarin-to-Flutter migrations in a team setting, including AI-assisted feature-by-feature porting with device QA and code review.
CORE SKILLS
Flutter & Dart: Flutter, Dart, Clean Architecture, feature-first architecture, BLoC/Cubit, GetIt, auto_route, Freezed, json_serializable,
build_runner, Dio, Retrofit
Xamarin & .NET: C#, Xamarin Native, .NET for iOS/Android, MvvmCross, MVVM, UIKit, AndroidX, Realm.NET, NUnit
Mobile Platforms: iOS, Android, MethodChannel / platform plugins (deep links and plugin maintenance), Swift/Kotlin interop,
camera, biometrics (app-level), push notifications (integration and bugfix), deep links
Backend & APIs: REST, Dio, Retrofit, AWS Amplify/Cognito (app integration, session in secure storage, magic link flows), Azure
AD/MSAL (consuming corporate SSO already designed by architecture)
Data & Offline: Realm (server snapshot → streams → UI), shared_preferences, secure storage, offline cache
Analytics & Monitoring: Firebase Analytics, Crashlytics, Performance, Remote Config, Firebase Messaging; Datadog RUM (PoC)
Testing & CI/CD: flutter_test, mockito/mocktail, NUnit, Azure DevOps Pipelines, flavors/environments, Firebase App Distribution,
TestFlight, App Store, Google Play, Sauce Labs; short Appium assignment (locators, device farm)
PROFESSIONAL EXPERIENCE

Trinetix Dec 2017 – Aug 2026 | Ukraine
Flutter Developer / Xamarin Developer
Delivered enterprise iOS/Android apps for employee experience, wellbeing, campus services, internal app distribution,
accounting research, and utilization tracking.
Built and migrated production Flutter apps using Clean Architecture, BLoC, GetIt, auto_route, Freezed, Dio, Retrofit, and Realm;
wrote and maintained native MethodChannel code (deep-link handling on iOS/Android, plugin fixes).
Modernized legacy Xamarin Native apps (C#, .NET for iOS/Android, MvvmCross, MVVM, Realm, UIKit, AndroidX).
Integrated with existing corporate auth and compliance stacks (Azure AD/MSAL, AWS Cognito, OneTrust consent, biometrics
unlock) without owning IdP architecture from scratch.
Used Firebase Analytics/Crashlytics/Performance/Remote Config in production; diagnosed crashes and ANRs from Crashlytics
and client reports.
Implemented offline caching with Realm (persist API snapshots, update UI via streams) and secure storage for sessions.
Supported Azure DevOps pipelines, multi-environment/flavor configs, code generation, store distribution (Firebase App
Distribution, TestFlight).
Wrote and expanded Flutter unit tests; completed a short Appium/Sauce Labs assignment (semantics identifiers, Android-only
offline scenarios).

Autoxloo Nov 2015 – Nov 2017
Xamarin Developer
Developed Android and iOS mobile clients for an automotive dealer CRM system using Xamarin and C#.
Built mobile workflows for dealer operations, customer management, CRM data access, and business process support.
Delivered production mobile applications for both Google Play and the App Store.

Tokyo.in.ua Oct 2013 – Jun 2015 | Dnipropetrovsk, Ukraine
Software Developer
Developed Windows Phone and Android applications using C#, Windows Phone SDK, HTTP/JSON integrations, and mobile UI
frameworks.
Built mobile apps including weather/location experiences, live tiles, image preview workflows, and companion tools for
designers.

SELECTED PROJECTS

Employee Utilization Tracking App
Flutter, Dart, Clean Architecture, BLoC, REST, Firebase
Main contributor on a consulting-firm utilization app (launch 2023): actual-vs-plan charts, speedometer gauge from server-driven
rules, hour breakdown by project codes, workload planning with evolving calculation rules, gamification, coach mode, and “view
as another user”.
Brought the product to production quality: empty/offline states, localization, biometrics fix, consent/terms, silent login without
network.
Enterprise Campus Services App
Flutter, Dart, Clean Architecture, BLoC, AWS Cognito, Firebase, Realm, native SDKs
One of the main contributors from project start: DI, use cases, storage, REST clients/interceptors, home feed, learning sessions,
networking feed with pagination, profile/QR, file download, deep links, tenant switching.
Diagnosed production crashes/ANRs (third-party indoor navigation SDK, Realm on iOS, splash/plugin mismatches) and ran a
large unit-test coverage campaign with reusable test patterns for the team.
Platform upgrades: Flutter dependencies, iOS plugins to SPM, Android Built-in Kotlin / AGP, release-build defect (APK missing
Dart native lib).
Short E2E assignment: in-app mock scenarios, semantics locators, Appium runs on Sauce Labs (Android could force offline; iOS
offline cases skipped).
Employee Wellbeing Platform
Flutter/Dart and Xamarin/.NET, BLoC, MvvmCross, Firebase, Azure AD/MSAL
Feature work and later platform modernization on a corporate wellbeing app (challenges, leaderboards, badges, engagement).
Owned UI and business logic around health-related screens; native HealthKit / Health Connect wiring was implemented by
teammates.
Xamarin stack upgrades (.NET, MvvmCross, Android API/16KB page size, R8) and production stabilization (Android list scroll,
pushes, biometrics).
Employee Belonging / DEI Engagement App
Flutter, Dart, Clean Architecture, BLoC, Dio, Retrofit, Azure AD/MSAL
Contributed to a Xamarin-to-Flutter migration, feature by feature: feeds, events, communities, search, polls/quizzes, onboarding,
push payloads, deep links, offline preload.
Migration process: dependency-aware feature order, device/emulator QA and UI polish, then team-lead review. Native
health/NFC stacks were out of scope here.
Enterprise App Catalog
Flutter, Dart, Clean Architecture, BLoC, Realm, Dio, MSAL, Firebase
Internal catalog for employees to discover and open corporate apps: browse/search, details, HTML content, diagnostics,
biometric unlock.
Realm as local cache; Firebase Analytics/Crashlytics/Remote Config; corporate SSO via existing MSAL setup.
Accounting Research Mobile App
Xamarin Native, C#, MvvmCross, Realm, Azure AD/MSAL, Firebase
Reading lists, glossary, registration/onboarding on both platforms; later production-blocking fixes (splash deadlock, Face ID /
Realm/AOT crashes) and Android 16KB toolchain work.
WebView rendering with custom CSS/JS, Realm local storage, Crashlytics, release infrastructure.
Automotive Dealer CRM Mobile Clients
Xamarin, C#, iOS, Android
Android and iOS CRM clients for dealership workflows; released to public stores.
Pixel Buddy
C#, Windows Phone, Android, WPF companion tooling, sockets, image encoding
Companion app for previewing Photoshop images on a device over Wi-Fi; sockets, image encoding/decoding, encrypted
transfer.

EDUCATION
IT Step Academy — Android Developer 2015 – 2016
IT Step Academy — C# Software Developer 2005 – 2007
Kharkiv National University of Economics — Specialist, Organization Management 2004 – 2007

LANGUAGES
Ukrainian: Native or bilingual | Russian: Native or bilingual | English: Intermediate (technical interviews in progress)