Ambitious software engineer based in Zagreb, Croatia, specialising in Java Spring Framework and cloud-native architectures. Currently building scalable distributed systems at GreenByteHub, working with Kubernetes, Elasticsearch, Keycloak, and Prometheus every day.
With 4+ years of professional experience across multiple companies, I've developed deep expertise in backend engineering, DevOps practices, identity & access management, and full-stack development. I thrive in fast-paced environments and love the challenge of building systems that scale.
Outside of work I build and maintain side projects: hrva.cc — a production link shortener with API, analytics, and a Next.js frontend — and gableci.hrva.cc, a lunch menu aggregator for Samobor restaurants powered by a Python OCR pipeline, Gemini AI, and web scraping.
Building and maintaining cloud-native applications with a focus on scalability and observability. Extensive work with Kubernetes orchestration, Elasticsearch for search and analytics, identity & access management with Keycloak and OPA, and Microsoft Entra ID integration.
Developed full-stack applications using Spring Boot backend with Angular frontend. Implemented CI/CD pipelines with GitHub Actions and managed infrastructure on AWS with Terraform for infrastructure as code.
Started professional career developing enterprise Java applications with Spring Boot. Gained hands-on experience with containerisation, database migrations, and build automation.
Full-stack production link shortener — Spring Boot REST API backend, Next.js frontend at app.hrva.cc, PostgreSQL. Self-hosted and actively maintained.
Weekly lunch menu aggregator for Samobor restaurants — Python pipeline OCRs physical menu photos with Gemini AI, scrapes web menus, generates daily AI picks, and serves structured JSON from CDN to a zero-backend static frontend.
Alternative PHP Symfony implementation of a URL shortener. Demonstrates MVC architecture and cross-language proficiency.
Full-stack banking app with MongoDB, Express, Angular, and Node.js. Account management, transaction processing, and auth.
Book management system in PHP with CRUD operations, search functionality, and user authentication.
3D physics puzzle game in Unity/C# with multiple levels and intuitive controls.
Zagreb University of Applied Sciences
2019 – 2022
Software Engineer at GreenByteHub in Zagreb, Croatia. I specialize in Java Spring Boot, Kubernetes, and cloud-native distributed systems with 4+ years of professional experience.
Java, Spring Boot, Kubernetes, Docker, Elasticsearch, PostgreSQL, Redis, Keycloak, OPA, Prometheus, Grafana, and cloud-native architectures on AWS and Terraform.
Email me at karlo@hrva.cc or connect on LinkedIn.
A production-grade link shortener I built — Spring Boot REST API backend, Next.js frontend at app.hrva.cc. Supports API key auth, click analytics, custom slugs, link expiration, and Google Safe Browsing.
A weekly lunch menu aggregator for Samobor restaurants. A Python OCR pipeline (Gemini AI) extracts menus from scanned images, combines them with web-scraped data, and generates AI-picked daily recommendations served as static JSON from a CDN.
Kubernetes, Docker, Helm, Terraform, Jenkins, Prometheus, Grafana, AWS, and Cloudflare — managing cloud-native infrastructure and CI/CD pipelines for production systems.
Keycloak for identity and access management, Open Policy Agent (OPA) for policy-based authorization, and Microsoft Entra ID for enterprise identity integration.
Bachelor of Computing from Zagreb University of Applied Sciences (TVZ), completed in 2022.