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║  Backend Developer | Spring Boot | System Architecture   ║
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const mateusz = {
    location: "Rzeszów, Poland 🇵🇱",
    education: "Computer Science @ University of Rzeszów",
    specialization: [
        "Spring Boot Modulith",
        "Domain-Driven Design", 
        "Event-Driven Architecture",
        "Distributed Systems"
    ],
    funFact: "Redisson > Jedis",
    passion: "Building scalable backend systems"
};

Engineering Thesis | Spring Boot 3.4 • Angular 19 • PostgreSQL • MongoDB • Redis

Full-stack healthcare platform with patient portal, doctor interface, and admin panel.

📊 Architecture: Spring Boot Modulith (Modular Monolith)
🎯 Patterns: DDD + Event-Driven + Hexagonal
💾 Databases: PostgreSQL
⚡ Caching: Redis + Local caching strategies
🔐 Security: JWT + OAuth2 + Multi-tier guards
📱 Frontend: 3 Angular SPAs with NgRx state management
🚀 Deployment: Docker multi-stage builds + Nginx

Key Features:

• ✅ Online appointment booking with real-time availability
• ✅ E-prescription system with verification codes
• ✅ Digital sick leaves (L4) management
• ✅ Smart doctor calendar with flexible scheduling
• ✅ Admin dashboard with system-wide analytics

Minecraft Sector System | Java • Redis Pub/Sub • MySQL

High-performance distributed system for Minecraft server handling 2000+ concurrent players.

🌐 Architecture: Multi-sector distributed system
🔄 Communication: Redis Pub/Sub for cross-sector messaging
📈 Scale: 2000+ concurrent players at peak
⚡ Performance: Custom packet handling and NBT management
🛠️ Features: Sector synchronization, player data sync

Electronic School Register | Spring Boot • Microservices • PostgreSQL • MongoDB • MySQL

Microservices-based electronic school register demonstrating polyglot persistence with multiple database systems.

🏗️ Architecture: Spring Cloud microservices with Eureka
📊 Databases: PostgreSQL + MongoDB + MySQL (polyglot persistence)
🔐 Security: JWT authentication + Spring Security
⚡ Resilience: Circuit Breaker pattern (Resilience4j)
🚀 Services: API Gateway, User Service, Grades, Notes, Classes
🐳 Deployment: Docker Compose orchestration

Technical Highlights:

• API Gateway with JWT-based authorization and routing
• Service Discovery with Netflix Eureka Server
• Synchronous inter-service communication
• MongoDB for document-based notes storage
• PostgreSQL for grades and class management
• MySQL for user data persistence
• Circuit Breaker for fault tolerance
• Complete separation of concerns across microservices

RPG Server Plugin | Java • Custom Game Mechanics

Complete RPG system plugin for Minecraft servers.

• 🎯 Custom RPG mechanics and gameplay systems
• 🗡️ Advanced combat and skill systems
• 📊 Player progression and stats management
• 🔧 Modular architecture for easy customization

• 🏥 Advanced healthcare system architectures
• ☁️ AWS Cloud services & deployment
• 🚢 Kubernetes & container orchestration
• 📡 Spring Cloud microservices
• 🎯 Service mesh architectures

+ Built telemedicine platform with 3 complete applications
+ Architected distributed gaming system for 2000+ concurrent users
+ Implemented DDD, Event-Driven, and Hexagonal patterns
+ Full-stack developer (Spring Boot + Angular)
+ Production-ready Docker deployments
+ 5+ open-source Minecraft plugins with real-world usage