Орест

Orest Tretiak
Android Developer

Projects
Virtual Space Android System Virtualization
Contacts Engineered an Application Virtualization Engine using system-level interception.
Built a Native Virtual Network stack for per-instance traffic tunneling to bypass
Instagram geo-restrictions. Implemented a Virtual File System to redirect I/O operations
for data segregation. Developed Hardware Injection mechanisms to mock
Telegram camera feeds via Surface API. Enforced Sandbox Containment with integrity
spoofing to prevent environment leakage.
LinkedIn
Technologies : Java, Kotlin, C++, AIDL, AOSP, Binder IPC, WireGuard, (proprietary)
it Hub
mail: oresttretia kk Cap Taxi Ride-Hailing Application
h one: + Built a location-based ride app with routing + address autocomplete.
Implemented distance-driven pricing (Great-circle, 15km threshold) synced with
driver rates. Added local driver selection with multi-parameter filtering and

Android Dev Skills profile views. Centralized localization for 6 languages (DE/EN/ES/FR/PL/UA) with
correct currency/distance formatting and RTL/LTR support.
Languages: Kotlin, Java, C++

Technologies : Kotlin, Jetpack Compose, Clean Architecture, MVVM, Coroutines,
Flow, Google Maps, Retrofit, Directions API, Places API, Android Fused Location
Architecture & Core: Clean Architecture, MVVM, MVI,
Provider, Compose Animations, Hilt, JUnit, Mockito, Gradle KTS
SOLID, Kotlin Multiplatform, Coroutines, Flow, RxJava,

Multi-threading, Dagger, Hilt,

Experience
System & Low-Level: NDK/JNI, AIDL, Binder IPC, AOSP

Tech Stack:

April 2025 - February 2026

Network & Data: Retrofit, Ktor, Native Networking Java, Kotlin, C++, NDK, AOSP, XML, (Pty)

(libc), Room, DataStore

Projects: Virtual Space (Android System Virtualization) Senior Android Developer (Contract)

Tech Stack:

UI & Media: Jetpack Compose, XML, Material 3, Kotlin, Java, C/C++, Jetpack Compose, Kotlin Multiplatform,
NDK, Facebook SDK

Media3, MediaStore API

Projects:

November 2024 - April 2025

EItaly Vpn (OpenVPN Client), Luma (Image Decoder),

Bricks Breaker Ball & Plinfun Club (Gambling), School Apps Android Developer (Freelance)
Build & Tools: Gradle , CMake, Git, GitHub,
(Web Apps), Anyalen (Website, Collaboration Project)
R8/Proguard, Linux Terminal

Tech Stack:

Kotlin, Jetpack Compose, Clean Architecture, MVVM,
Testing: Unit Testing (JUnit, Mockito) Coroutines, Flow, RxJava, Retrofit, Hilt, Google Maps, Firebase
April 2023 - November 2024
(Auth, Realtime DB, Storage, Crashlytics), JUnit, Mockito

Android Developer (Independent)
Languages
Projects:

Above Music (Offline Music Player), Cap Taxi (Ride-Hailing),
Aqua AI (OpenAI Client), Weather (Live Forecast)

English - Upper-Intermediate (B2) Tech Stack:

Ukrainian - Native Java, XML, Firebase, SQL, Retrofit, AdMob, Facebook SDK
October 2021 - April 2023

Projects:
Android Developer

Confidential Android Project (NDA), Above Music (Offline
Music Player) Confidential Project (NDA)
Additional Skills

App Security & Diagnostics:
Education
Frida, JADX, Ghidra
INE eMAPT: December 2025 - Present
Web Fundamentals:
Google Developers Program: December 2023 - September 2024

JavaScript, HTML, CSS (Kotlin, Jetpack Compose, Material 3)
Udacity (JavaRush): January 2021 - March 2021 (Android)
JavaRush: August 2020 - January 2021 (Java Syntax, Java Core, Java Multi-threading)