Roland Haller ProHaller

Hi there 👋

Working as a Creative Director in Tsunagaru Inc
Training as a Software Engineer specializing in Rust, Terminal UIs, and AI agentic workflows.

I build games & tools for fun and profit.

Based in Fukuoka, Japan for now / working remotely.

A terminal RPG inspired by Shadowrun, where the Game Master is driven by AI.

Natural language player input, interpreted via structured prompts, assistant functions and hard-coded rules
Persistent character sheets, inventory, skills, save/load capabilities
Terminal UI built with ratatui, with clean layout, input handling, and redraws
Integration with the OpenAI API for narrative generation, with strategies to maintain coherence & minimize prompt drift
Audio cues / voice styles for immersive narration

Area	Skills / Tools
Languages	Rust, plus experience with … (you can list any others: e.g. Python, JS, etc.)
Rust Ecosystem	`ratatui`, `serde`, `tokio` / async, error handling (custom error types, `Result`, etc.), modular architecture
AI & Prompt Engineering	Designing assistant functions, state summarization, prompt chaining, fallback/error handling for API responses
UI / UX	Terminal UI design, layouts, input parsing, responsive redraws and handling slow external calls
State Management & Persistence	Save/load systems, versioned serialization schemas, backward compatibility, struct/enums design to support extendability
Testing & Code Quality	Unit tests, integration tests, docs, clean module boundaries, code reviews, refactoring

Category	Description
Learning	Advent of Code - who could have thought that Data structures and algorithms in rust could be fun‽
Writing	Blog posts.
Yapping	Mastodon / Bluesky / LinkedIn.
Organizing	Fukuoka Rust – A meetup for Rust enthusiasts.
Teaching	Education Technology for 1 year Uni students in Osaka

Thanks for stopping by. Let’s build cool stuff together!