Hi, I'm
Marlon Kranz
Marlon
Kranz
Full-Stack Engineer
Marlon Kranz
Full-Stack Engineer
> initializing portfolio_
4+
Years exp.
7+
Projects
Java / Spring
Main stack
Hi, I'm
Creative Technologist
Marlon Kranz
Full-Stack Engineer
About Me
Software engineer based in Hamburg, currently finishing my B.Sc. in Wirtschaftsinformatik (Business Informatics) at the University of Hamburg. My focus is backend development, from microservices to infrastructure. I particularly enjoy picking up new technologies and domains. After a full academic year at San Diego State University, I returned to Hamburg to write my bachelor thesis while working as a student engineer at OTTO, helping build the next-generation product data onboarding platform.
Languages
Backend & Infra
Frontend & Desktop
Tooling
Spoken Languages
Experience
Education
Projects
Bachelor Thesis: BPMN Process Modeling as Code
2025
A domain-specific language that compiles textual process definitions to executable BPMN 2.0 XML for Camunda and Operaton. My open-source bachelor thesis at the University of Hamburg.
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MinJ: A Programming Language for the JVM
2024
A scripting language I designed and implemented from scratch: ANTLR4 grammar, tree-walking interpreter in Java, classes, methods, lists, and a CI/CD pipeline that ships fat-JARs on every release.
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devline: Agentic Dev Pipeline for Claude Code
2026 – Present
A Claude Code plugin that structures AI coding into a multi-agent pipeline with TDD, parallel implementation, automated review, and security hooks that let agents run autonomously without wrecking your repo.
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Portfolio Website
2026 – Present
The site you're on right now. Built from scratch with four switchable design themes (each with dark/light variants), full EN/DE internationalization, MDX project pages, and self-hosted on my own Linux server.
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Fortalis: Multiplayer Strategy Game
2025 – Present
A multiplayer strategy game I'm building from scratch: an open-source auth service (Spring Boot 4, RS256 JWT, TOTP 2FA), a modular game backend with Spring Modulith, and a Unity client for Android, iOS, Web, and PC.
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VPS: Personal Cloud and Dev Infrastructure
2025 – Present
Self-managed Linux VPS hosting personal services and project backends. Containerized with Docker Compose, routed through Traefik, with remote storage boxes for mass storage.
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The King's Game: Modular Chess Platform
2023 – Present
A multi-module Java chess platform with local and online play, Chess 960, 6 visual themes, and a concurrent TCP server with authentication and matchmaking. Built with Java 17, JavaFX 21, and 75 test classes.
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