🚀 Open to Work

Hi, I'm Roman Tsisyk

Android Developer & Mobile Solutions Expert

Crafting exceptional Android experiences with 12+ years in development. Specialized in Kotlin, Java, and modern architecture patterns. Successfully delivered apps with 500K to 1M+ users for GlobalLogic, HP, and GSM Billing.

View Projects GitHub
10+ Projects
12+ Years Exp
1.5M+ Total Users
MainActivity.kt 
class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            MyAwesomeApp {
                // Building amazing Android apps
                // with modern tools and best practices
            }
        }
    }
}
PORTFOLIO

Featured Projects

A showcase of my best Android applications and UI/UX work

BetVictor Apps
Coming Soon

BetVictor Apps

Latest

Sports betting and gaming applications for one of Europe's leading online gaming companies

Kotlin Jetpack Compose MVVM
Coming Soon NDA Protected
HP Poly Lens
View Details →

HP Poly Lens

HP Inc

Enterprise IoT app with 30% faster load times, 60% smaller app size. Multi-modular BT + IoT architecture.

Kotlin Jetpack Compose Bluetooth LE IoT
View Project NDA Protected
Kasa Stefczyka
View Details →

Kasa Stefczyka

150K+ Users

Mobile banking application for Polish credit union with secure transactions and Google Pay

Android Kotlin Security Google Pay
View Project Play Store
FollowMyMoney App
View Details →

FollowMyMoney

Finance

Professional wealth management platform for tracking investments, expenses, and financial goals

Kotlin Jetpack Compose Room DB
View Project GitHub
Netti App
View Details →

Netti

Featured

Professional network testing suite with speed test, iPerf3, ping, and trace route tools

Kotlin Jetpack Compose Material 3
View Project GitHub
Earnly App
View Details →

Earnly

In Development

UK tax reporting platform with QuickBooks, Sage & Xero integrations. Real-time tax liability tracking.

Kotlin Jetpack Compose MVVM
View Project Website
Job Recruiter App
View Details →

Job Recruiter

HR Tech

Modern recruitment platform connecting job seekers with employers through intelligent matching

Kotlin MVVM Retrofit Room DB
View Project GitHub
SMS HUB
Coming Soon

SMS HUB

80% Test Coverage

SMS management and competition apps with A/B testing for GSM Billing Ltd

Android Firebase Test Lab GSM Billing
Coming Soon Private
CryptoKit
View on GitHub →

CryptoKit

Open Source

Streamlined cryptographic operations for secure Android development. Encryption, decryption, and hashing utilities.

Kotlin Security Cryptography
View Project GitHub
Sunrise-Sunset-SDK
View on GitHub →

Sunrise-Sunset-SDK

Open Source

Modular SDK for calculating sunrise and sunset times globally. Includes Android and Wear OS demo apps.

Kotlin SDK Wear OS API
View Project GitHub
bleX
View on GitHub →

bleX

Open Source

Advanced, coroutine-based Bluetooth Low Energy (BLE) library for Android. Simplified BLE operations.

Kotlin BLE Coroutines Library
View Project GitHub
Chrome Extensions
View Collection →

Chrome Extensions

6+ Extensions

Collection of useful browser extensions for productivity, news aggregation, and enhanced browsing. All free & privacy-focused.

JavaScript Chrome API HTML/CSS RSS
View Collection Chrome Store
EXPERTISE

Skills & Technologies

My technical stack and proficiency levels

📱 Android Development

Kotlin Expert
Jetpack Compose Advanced
Android SDK Expert
Material Design Advanced

🏗️ Architecture & Patterns

MVVM Expert
Clean Architecture Advanced
Dependency Injection Advanced
Coroutines & Flow Advanced

🗄️ Backend & Database

Firebase Advanced
Room Database Expert
REST APIs Advanced
SQLite Advanced

🛠️ Tools & Others

Git Android Studio Gradle CI/CD (Azure) JUnit MockK Espresso UIAutomator Appium Jira Confluence Agile/Scrum GraphQL RxJava LeakCanary WorkManager

🌐 Cross-Platform

Flutter Advanced
Dart Advanced
BLoC Architecture Intermediate
ABOUT ME

Passionate Android Developer

Senior Android Developer with 12+ years in development, including 6+ years building scalable and user-friendly Android apps for tech companies like HP, GlobalLogic, and GSM Billing. Expertise in performance optimization, caching, app security, and integrating native components/SDKs.

Track record of reducing app load times by 30%, increasing crash-free sessions by 0.2%, and reducing app size by 60%. Effective collaborator with cross-functional teams based in different countries. Skilled in fintech applications, IoT communication, and enterprise solutions.

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Education

Masters in Engineering - Ternopil National Technical University

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Experience

12+ Years in Development, 6+ in Android

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Achievements

1.5M+ Users, Fortune 500 Clients

Profile
CREDENTIALS

Certifications & Training

Professional certifications and continuous learning

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Atlassian Agile Project Management

Professional Certificate

2024
💻

Career Essentials in GitHub

Professional Certificate

2024
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Cybersecurity by Microsoft

Microsoft & LinkedIn Certificate

2024
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Dependency Injection with Dagger 2 and Hilt

Android Advanced Course

2021
⚡

Coroutines for Android Masterclass

Kotlin Coroutines Deep Dive

2021
📊

Data Structures and Algorithms

Deep Dive Using Java

2021
☁️

Azure DevOps CI/CD Pipelines

DevOps Automation

2021
GET IN TOUCH

Let's Work Together

Have a project in mind? Let's discuss how we can collaborate

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📱
💼
📍

Location

Wroclaw, Poland

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