Rafał Stańczuk

👋 Hi, I'm Rafał Stańczuk

Android Developer | AI Enthusiast | Outdoor Enthusiast

Passionate developer with over 13 years of professional experience in the IT industry. My programming journey began in 2000-2001, and I specialize in building robust, scalable mobile applications with a focus on clean architecture, MVVM, and modern Android development practices.

When I'm not coding, you'll find me exploring caves, running in the mountains, or enjoying outdoor adventures. 🏔️⛰️

About Me

13+ Years Experience

Over a decade of professional Android development experience across diverse domains including Healthcare, Automotive, IoT, Telematics, and eCommerce.

Led teams, mentored developers, and delivered production-ready applications that serve thousands of users.

Clean Architecture

Specialized in MVVM, Clean Architecture, and MVP patterns.

Expert in reactive programming with RxJava, Coroutines, and Flow.

Strong focus on maintainable, scalable, and testable code that stands the test of time.

AI & Machine Learning

Certified in AI Agent Development & LLM Integration.

Experienced with OpenAI, Anthropic, Ollama APIs, RAG, Vector Databases, and Multimodal AI.

Combining traditional mobile development with cutting-edge AI technologies.

Outdoor Enthusiast

My passion for outdoor activities often inspires my technical projects, especially those related to geospatial analysis and activity tracking.

Love exploring caves, running in mountains, and outdoor adventures that fuel both my personal life and professional creativity.

Professional Experience

🚀 Current Activities

Mentoring & Beta Testing

  • Mentoring colleagues in mobile application development
  • Google Play app beta testing
  • Supporting SaaS and mobile app development

GpxAnalyzer - Production Android App

Currently developing and maintaining a production Android application published on Google Play Store. This project demonstrates full-stack Android development expertise from architecture to deployment.

Technical Implementation:

  • Architecture
    Clean Architecture with MVVM pattern, 13 Gradle modules
  • Technologies
    Java, Kotlin, Dagger Hilt, Room, RxJava, Jetpack (Navigation, LiveData, ViewModel), OAuth2
  • Third-Party Integration
    Strava API with secure OAuth2, dynamic rate limiting, smart caching (60-80% API reduction)
  • Advanced Features
    Digital Signal Processing for GPS data cleaning, multi-chart synchronization, geospatial analysis with OpenStreetMap
  • Performance
    Handles 10,000+ trackpoints smoothly, optimized for tablets and large screens

Development Excellence:

  • CI/CD Pipeline
    Automated GitHub Actions workflows for testing, building, and releasing
  • Testing
    112+ unit tests and 69+ instrumentation tests across 24 test suites
  • Release Management
    Automated version management, encrypted updates, release notes generation
  • Code Quality
    Enterprise-grade practices with automated quality checks

Production Experience:

  • Google Play Store deployment and maintenance
  • Beta testing program management
  • User feedback integration and iterative improvements
  • Privacy policy compliance (GDPR)
  • Strava Developer Program compliance and best practices

🎓 AI Development Certification

AI_devs Program

  • Advanced AI Agent Development & LLM Integration
  • Certificate: View Credentials
  • Skills: Python, OpenCV, LLM APIs (OpenAI, Anthropic, Ollama), RAG, Vector Databases, Multimodal AI, AI Agent Architecture

💻 Professional Summary

13+ years of Android Development Experience

With over a decade of experience in mobile development, I've worked across diverse domains and technologies:

Domain Expertise:

  • Healthcare (~2 years)
    Led Android development for medical applications, managed cross-platform coordination, mentored teams, and worked with international teams on healthcare solutions
  • Automotive (~1 year)
    AOSP development for automotive platforms
  • IoT (~2 years)
    Smart Home and Industrial IoT solutions, BLE integration, protocol implementation
  • Telematics (~1 year)
    Navigation systems and location-based services
  • MDM (~1 year)
    Mobile Device Management solutions
  • eCommerce (~1 year)
    Shopping platform development
  • UCC Systems (~1 year)
    Unified Collaboration and Communication systems, SDK development
  • Research & Development (~4 years)
    Indoor Positioning Systems, A-GPS, algorithm research

Leadership & Collaboration:

  • Led Android development teams as Main Android Developer
  • Managed feature estimation, legacy code maintenance, and cross-platform coordination
  • Mentored team members and improved CI/CD processes
  • Collaborated with international teams across multiple time zones
  • Participated in design and release processes
  • Provided technical leadership and code reviews

📚 Education

Master of Computer Science - Faculty of Mechanical Engineering and Computer Science

  • Specialty: Applied Computer Science
  • Master Thesis: "Collision detection of irregular objects in two-dimensional Cartesian space"
  • Technologies: C++, OpenGL, Linux
  • Research: Time profiling, swarms of objects, clustering algorithms

Previous Studies: Numerical methods (Finite Derivative Methods, Finite Elements Methods)

  • C++, STL, OpenGL, OpenMP

Technical Skills

Languages

Languages

Proficient in multiple programming languages with extensive professional experience.

Language Expertise:

  • Java
    13+ years of professional experience
  • Kotlin
    5+ years of production experience
  • C++
    13+ years (including native development, JNI, NDK)
  • Python
    Recent experience in AI agent development and LLM integration
Android Technologies

Android Technologies

Comprehensive expertise in modern Android development stack and best practices.

Technology Stack:

  • Architecture
    MVVM, Clean Architecture, MVP, Multi-module Architecture
  • Jetpack
    Room, Navigation, LiveData, ViewModel, Data Binding, View Binding
  • Dependency Injection
    Dagger Hilt, Dagger 2
  • Reactive Programming
    RxJava, RxAndroid, Coroutines, Flow
  • Networking
    Retrofit2, OkHttp3, OAuth2, API Rate Limiting
  • Persistence
    Room, Realm, SQLite, Smart Caching
  • Geospatial
    OpenStreetMap, GPS Processing, Coordinate Transformations
  • Other
    BLE, NFC, ML Kit, NDK, JNI, OpenGL, Digital Signal Processing
Tools & Platforms

Tools & Platforms

Professional tools and platforms for efficient development workflows.

Tools & Platforms:

  • Development
    Android Studio, Cursor
  • Version Control
    Git, GitHub
  • CI/CD
    GitHub Actions, Automated Testing, Release Management
  • Project Management
    JIRA
  • Operating Systems
    Linux
AI & Machine Learning

AI & Machine Learning

Certified expertise in AI agent development and LLM integration technologies.

AI Technologies:

  • LLM Integration
    OpenAI, Anthropic, Ollama
  • RAG
    Retrieval-Augmented Generation
  • Databases
    Vector Databases, Graph Databases
  • Multimodal AI
    Text, Voice, Image processing
  • Development
    AI Agent Development, Advanced Prompt Engineering
Domains

Domain Expertise

Extensive experience across diverse industry domains and specialized applications.

Industry Domains:

  • Healthcare
    Medical applications, health monitoring
  • Automotive
    AOSP, Android Automotive
  • eCommerce
    Shopping platforms
  • IoT
    Smart Home, Industrial IoT
  • MDM
    Mobile Device Management
  • Telematics
    Navigation systems, location services
  • Wellness
    Fitness tracking, activity analysis

Featured Projects

Explore my portfolio of professional and passion projects

GpxAnalyzer

GpxAnalyzer

Production Android App — Published on Google Play Store

A comprehensive GPX activity analyzer for athletes and outdoor enthusiasts with enterprise-grade development practices.

Core Features:

  • Multi-chart synchronization with real-time updates
  • Interactive maps with OpenStreetMap integration
  • Strava API integration with OAuth2 and smart rate limiting
  • Digital Signal Processing for GPS data cleaning
  • Advanced statistical analysis and route visualization

Technical Excellence:

  • Clean Architecture with MVVM (13 Gradle modules)
  • 112+ unit tests, 69+ instrumentation tests
  • Automated CI/CD pipeline with GitHub Actions
  • Performance optimized for 10,000+ trackpoints
  • Smart caching reducing API calls by 60-80%
Jurassic

Jurassic

Geospatial image viewer designed for speleological (caving) exploration activities. Perfect for mapping and analyzing cave systems with advanced image processing capabilities.

Key Features:

  • Advanced image processing for cave mapping
  • Geospatial visualization and analysis
  • Specialized tools for speleological exploration
Task Manager PHP

Task Manager PHP

Production-ready Task Manager with vanilla PHP 8.2.

Built with modern web development practices and comprehensive project management features.

Key Features:

  • RESTful API architecture
  • Interactive Gantt chart with drag-and-drop scheduling
  • Modern PHP 8.2 with best practices
  • Comprehensive task management capabilities
ContentObserverService

ContentObserverService

Educational Android Project demonstrating background services, content observers, and data synchronization.

Perfect example of Android background processing and data management.

Key Features:

  • Background service implementation
  • Content observer patterns
  • Data synchronization mechanisms
  • Android background processing best practices

Early Programming Projects

My programming journey started in 2000-2001. These early projects represent my exploration of fundamental programming concepts.

Project Highlights:

  • PascalPaintRs
    Graphics programming with Borland Pascal — one of my first explorations into graphics programming
  • PascalStatkiRS
    Classic Battleship game in Borland Pascal — demonstrating game programming fundamentals

More Projects

Explore all my projects, contributions, and professional work across different platforms and technologies.

Additional Work:

  • Open source contributions
  • Professional projects across various domains
  • Educational and experimental projects

Development Excellence

Professional-grade development practices demonstrated in production applications

My development approach emphasizes quality, maintainability, and scalability. Through projects like GpxAnalyzer, I've implemented enterprise-grade practices that ensure reliable, performant, and maintainable code.

CI/CD & Automation

Complete automation workflows ensuring quality and reliability throughout the development lifecycle.

Key Capabilities:

  • Complete CI/CD pipelines with GitHub Actions for automated testing, building, and releasing
  • Automated code quality checks, test execution, and release validation before deployment
  • Automated version management, signed APK/AAB generation, and GitHub release creation

Comprehensive Testing

Enterprise-grade testing practices ensuring code reliability and preventing regressions.

Testing Coverage:

  • 112+ unit tests across 24 test suites ensuring code reliability and preventing regressions
  • 69+ instrumentation tests validating app behavior on real Android devices
  • All tests run automatically on every commit, providing continuous quality assurance
Performance

Performance & Optimization

Optimized for handling large datasets and efficient resource utilization.

Optimization Strategies:

  • Optimized algorithms handling 10,000+ trackpoints with smooth performance
  • Intelligent caching strategies reducing API calls by 60-80% while maintaining data freshness
  • Efficient memory management, background processing, and responsive UI design
Architecture

Clean Architecture

Well-structured codebase designed for long-term maintainability and scalability.

Architecture Principles:

  • 13 Gradle modules with clear separation of concerns and dependencies
  • Consistent use of MVVM with proper data flow and state management
  • Code structured for long-term maintainability, scalability, and team collaboration
API Integration

Third-Party API Integration

Secure and efficient integration with external APIs and services.

Integration Features:

  • Secure authentication flows with automatic token refresh and error handling
  • Dynamic rate limit management with intelligent queue systems and retry logic
  • Smart request batching, caching strategies, and minimal API usage patterns
Production

Production Deployment

Complete production deployment and maintenance lifecycle management.

Deployment Practices:

  • Full app lifecycle management from development to production release on Google Play Store
  • Version control, release notes automation, and staged rollout strategies
  • Beta testing programs, user feedback integration, and continuous improvement cycles
112+
Unit Tests
69+
Instrumentation Tests
13
Gradle Modules
100%
Automated CI/CD
60-80%
API Reduction
10K+
Trackpoints
13+
Years Experience
5+
Years Kotlin
8+
Years Reactive
2000
Started Coding