Design Engineer · Artist · Researcher

GÜNTHERBRUNNER

Shipping products where precision meets creativity.

Tokyo / Japan

2007→ Now

Arrived as a MEXT Scholar. Stayed to build and ship.

Coordinates

35.6895N · 139.6917E

Notes

MEXT scholar (top 1%)
Permanent resident
Bilingual EN / JP

Day job

CyberAgent

Since 2012 · AI innovation

13+ years shipping large-scale products with strong design systems and engineering foundations.

Studio

G Productions

g-productions.studio ↗

Open for collaborations: design systems, product design, and fractional engineering.

Open for projects

Scroll down

Let's build something real.

Portfolio, tools, and collaboration notes — laid out like a catalog.

ProfileAvailable

Günther Brunner

Design Engineer

Career

Experience

13+ years building products at scale. AI, design systems, and developer tools.

01

13+ years

Current Full-time

CyberAgent, Inc.

Tokyo, Japan · 2012 - Present

→

AI Design Engineer

2024 - Present

→

Product Manager | AI Engineer | Frontend Engineer | UI/UX Designer

2021 - Present

→

Product Manager

2015 - Present · Open-Source & SaaS for developers

TypeScript React AI/LLM Product Management UI/UX Design
Highlights
- Led OpenSTF (13k+ GitHub stars)
- Hayabusa Image AI (20+ group companies)
- Multiple Best Project Awards
02

1+ year

Current Founder

G Productions, LLC

Wyoming, USA (Remote) · 2024 - Present

→

Founder & CEO

2024 - Present

Full-stack Development Consulting Design Systems
Highlights
- Design & development consulting
- Fractional engineering
03

11 months

Full-time

AI Shift, Inc.

Tokyo, Japan · 2023 - 2024

→

UI Designer, AI & Frontend Engineer

2023 - 2024

AI Engineer Prompt Engineering Frontend UI Design
Highlights
- AI-powered products
- LLM integration
04

2 years

Full-time

Up-frontier Co. Ltd

Tokyo, Japan · 2010 - 2012

→

Creative Director and Engineer

2010 - 2012

Software Engineer UI/UX Design Smartphone Development
Highlights
- Smartphone app development

Expertise

Skills

Full-stack capabilities. From design to deployment.

Languages

5 skills

TypeScript

8+ Expert
JavaScript

13+ Expert
Python

5+ Advanced
Go

3+ Intermediate
HTML/CSS

15+ Expert

Frontend

4 skills

React

5+ Expert
Vue.js

5+ Advanced
Astro

2+ Advanced
TanStack

3+ Advanced

Backend

4 skills

Node.js

10+ Expert
Bun

2+ Advanced
Hono

2+ Advanced
REST API

10+ Expert

Cloud & Infra

5 skills

AWS Lambda, S3, CloudFront, etc.

8+ Advanced
GCP

5+ Advanced
Vercel

4+ Expert
Cloudflare

5+ Expert
Docker

6+ Advanced

AI / LLM

3 skills

OpenAI / Claude

3+ Expert
AI Agents

2+ Advanced
Context Engineering

3+ Expert

Coding Agents

5 skills

Claude Code

1+ Expert
Cursor

2+ Expert
Codex

1+ Advanced
Amp

1+ Advanced
Droid

1+ Advanced

Database

5 skills

Convex

2+ Expert
Turso

1+ Advanced
MySQL

10+ Advanced
PostgreSQL

6+ Advanced
Drizzle ORM

2+ Advanced

DevOps

5 skills

Git

13+ Expert
GitHub Actions

5+ Expert
CI/CD

10+ Expert
Alchemy

1+ Expert
Serverless

6+ Expert

Design

5 skills

Figma

6+ Expert
UI/UX Design

13+ Expert
Design Systems

8+ Expert
Adobe CC

10+ Advanced
Motion Design

5+ Advanced

Management

5 skills

Product Management

10+ Intermediate
Tech Lead

8+ Intermediate
Agile/Scrum

10+ Intermediate
Team Leadership

8+ Intermediate
Stakeholder Mgmt

10+ Intermediate

Available for Remote Work

Full-remote OK · Flex hours · Based in Tokyo (JST)

EN / JP / ES Trilingual Permanent Resident

Portfolio

Selected Work

Products shipped. Problems solved. Experiences crafted.

Toolkit

Tech Stack

Tools define velocity: thinking → building → shipping.

Productivity

Tools that compress feedback loops — from thinking to shipping.

Filter

…and always exploring what’s next.

Research

Papers

Publications and technical notes.

P01

2025
Paper

InstallTrust Score: Universal Trust Metrics for Software Installation Security

Quantifying Installation Security Trust Across All Computing Platforms

The last mile of the software supply chain is installation. InstallTrust Score introduces a universal 0–100 metric for installation trust across platforms (app stores, package managers, containers, scripts), decomposes trust into six weighted factors, and benchmarks 100 installation methods across 8 platform categories.

Key insight

Trust varies more by installation method than by platform: the same OS can span an 80+ point “trust gap” depending on how you install.
- — Six-factor model (25/25/15/15/10/10): Integrity, Review & CI/CD, Provenance, Least-Privilege, Update Security, Distribution Hygiene.
- — Empirical benchmark: 100 installation methods across 8 categories.
- — Headline contrast: iOS App Store ~98 vs curl|sh ~15–25 (trust failure by design).
- — Example: Nix on Linux (~94) can exceed unverified script installs on macOS (~43).
- — Android’s 2026 developer verification moves the baseline upward—and changes what “open” means.
PDF EN ↗ PDF JA ↗
Open

Read ↗

About

Background

Development + design end-to-end. Systems-minded, shipping-focused.

01 Track Record

CyberAgent: AI Innovation · 13+ years
guntherbrunner.com: Development · Design · Research

02 Tokyo

Since: 2007
MEXT: Scholar (top 1%)
Status: Permanent Resident
Language: EN / JP

03 Open Source

OpenSTF: 13,000+ GitHub ★
Adoption: 200+ companies

04 Enterprise

National Tax Agency
JICA
Ministry of Internal Affairs
Fortune 500 Tech

Let's
Build

Ready to ship something extraordinary? Let's push boundaries together.

Get in Touch Visit Studio GitHub

GÜNTHERBRUNNER