Java Backend Developer | Hamburg, Germany

I build solutions to real-world problems that bring real value to the table. My focus is on clean architecture, comprehensive testing, and production-ready applications.

🎯 Currently seeking Junior Java Spring Boot or Software Developer positions in Hamburg (Available Feb-March 2025)

• 🔭 Building production-grade Spring Boot applications with emphasis on testing and security
• 🌱 Actively learning: AWS, Kubernetes, Kafka, CI/CD pipelines, and AI integration
• 💡 Passionate about backend development, cloud deployment, and scalable architectures
• 🏃‍♂️ When I'm not coding, you'll find me doing sports
• 🎓 E-Commerce Graduate with IT Assistant background
• 📍 Based in Hamburg, Germany

Backend & Frameworks

Databases & Search

Testing & Quality

DevOps & Tools

Frontend & Other

Tech: Spring Boot 4, PostgreSQL, Keycloak, Next.js 16, OpenRouter AI

A full-stack flashcard application with AI-powered card generation and a three-tier difficulty system.

Key Features:

• 🧪 Comprehensive testing with Testcontainers, Mockito, and MockMvc
• 🔐 JWT/OAuth2 authentication via Keycloak
• 🤖 AI integration for automated flashcard generation
• 📊 Clean architecture with proper separation of concerns

📺 Watch Demo | 📖 Read Docs

Tech: Spring Boot, Elasticsearch, Keycloak, Docker, Railway

A backend-focused platform for gym reviews with full-text search and geo-location queries.

Key Features:

• 🔍 Elasticsearch for full-text & geo-radius search
• 🚀 Deployed on Railway with Docker containerization
• 🔐 OAuth2 Resource Server with Keycloak integration
• 📸 Secure file upload system with path-traversal protection

📺 Watch Demo | 📖 Read Docs

🧪 Testing Culture
Unlike many juniors, I prioritize testing from day one. My projects feature production-parity testing with Testcontainers, comprehensive unit tests with Mockito, and integration tests with MockMvc.

🚀 Production Experience
I don't just build localhost demos. My applications are deployed on cloud platforms with proper security (OAuth2/JWT), containerization (Docker), and real-world features (file uploads, geo-search, AI integration).

💼 Business + Technical Mindset
With an E-Commerce background combined with software development skills, I understand both technical implementation and business value - I can bridge the gap between developers and stakeholders.

I'm actively looking for opportunities where I can contribute to impactful projects and grow as a developer.

📍 Hamburg, Germany
💼 Open to: Junior Java Spring Boot Developer, Backend Developer, Software Engineer positions

class Jo extends Developer {
    String[] currentlyLearning = {
        "AWS Cloud Services",
        "Kubernetes Orchestration", 
        "Apache Kafka & Event-Driven Architecture",
        "CI/CD Pipelines (GitHub Actions)",
        "AI Integration & LLM APIs"
    };
    
    String lookingFor = "Junior Java Spring Boot position in Hamburg";
    
    @Override
    public void work() {
        while (motivated) {
            learn();
            code();
            test();
            deploy();
        }
    }
}