AI-Native Product Studio — Tokyo
Work worth
signing.
G Productions Japan is a product studio in Tokyo. A small senior team, working with orchestrated AI agents, takes software from first plan to running product — and we only ship work we are willing to sign.
EST. 2026 · TOKYO · JAPAN
Trade name G Productions Japan LLC
Incorporated June 4, 2026
Corporate number 5011003024600
Head office Meguro, Tokyo
01Philosophy
Speed from AI. Quality from craft
Generative AI changed the speed of software by an order of magnitude. What it did not change: the judgment to decide what deserves building, and the responsibility to finish it properly. We combine orchestrated AI agents with fifteen years of product discipline to deliver with a studio-sized team what once took a large engineering organization.
Our focus is intellectual property × AI — building the software that carries Japan's dormant patents and technology to the global market.
02Services
From first plan to running product
- 01
Product development
Planning, UI/UX design, engineering, and operations for new products — web, mobile, and cloud (SaaS). We ship small and fast, then grow what the data proves.
- 02
Technical advisory & AI adoption
CTO/CPTO-level counsel on a monthly retainer: engineering-organization design, technology decisions, and the transformation of development processes with AI agents. We sit in the boardroom and in the codebase.
- 03
IP technology & R&D
Research and development of AI systems for the patent and IP domain — document analysis, valuation, and the intelligence that supports expert judgment.
- 04
Our own products
KAISHA NOW (AI-assisted company formation for Japan), Gathrly (an event platform for small paid gatherings), and here.dj (for music, DJs, and events), among others.
Other fields Design (UI/UX & brand) · translation & localization · marketing & PR · events, music festivals & spatial production · film, media & publishing · music production · venture investment & cross-border business development — the wider scope set out in our articles of incorporation.
03Works
Selected work
Featured Work
PatentOS
Client — IP Rich Inc. Field — IP technology Since — 2026
An AI-native platform for the patent domain. G Productions serves as the development partner — from product strategy to AI architecture and full-stack engineering to brand and design.
Scope — Product strategy / AI architecture / Full-stack engineering / Brand & design
Our Role
- Product strategy
- AI architecture
- Full-stack engineering
- Brand & design
2026– KAISHA NOW In-house product AI-assisted company formation for Japan — from articles of incorporation to post-registration filings (in development) ↗ 2025– Gathrly In-house product Event platform for small paid gatherings, JP/US (in development) ↗ 2025– here.dj In-house product A product for music, DJs, and events (in development) ↗
※ Some of our products were started by the representative before the company's incorporation (June 2026).
Years building products 15+
GitHub ★ — founder's OSS 13,000+
Companies running it 200+
Languages — JA · EN · ES 3
04Representative
Founder
Founder / Design Engineer
Günther Brunner
ブルンナー・グンタ
A design engineer, Günther came to Japan in 2007 as a MEXT government scholar and has spent fifteen-plus years building products in the Japanese tech industry. His open-source project OpenSTF has earned more than 13,000 GitHub stars and runs at over 200 companies worldwide, including Netflix and Alibaba. His work spans public-sector systems for Japan's National Tax Agency, JICA, and the Ministry of Internal Affairs and Communications, as well as AI product development at major tech companies. Permanent resident of Japan; trilingual in Japanese (JLPT N1), English, and Spanish.
05News
Announcements
- We are hiring
- Corporate website launched
- Started product-development engagement in IP technology
06Company
Corporate profile
| Company name | G Productions Japan合同会社 |
|---|---|
| English name | G Productions Japan LLC |
| Incorporated | June 4, 2026 |
| Representative | Günther Brunner (ブルンナー・グンタ) |
| Head office | THE N3, 4-4-12 Aobadai, Meguro-ku, Tokyo 153-0042, Japan |
| Phone | 03-6822-6520 |
| Corporate number | 5011003024600 |
| Invoice reg. no. | T5011003024600 Qualified invoice issuer |
| Fiscal year | June 1 – May 31 |
| Languages | Japanese · English · Spanish |
| Business |
|
| Principal clients | IP Rich Inc. |
07Careers
Work worth signing — together
A small senior team that finishes strategy, design, and code by the same hands. We're hiring people who wield AI well and take responsibility down to the detail — remote, from our office (THE N3, Aobadai, Shibuya), or hybrid.
- Remote Fully remote, from anywhere in Japan.
- In office From our office, THE N3 in Aobadai, Shibuya.
- Hybrid Mix remote and office however works for you.
08Contact
Get in touch
For project inquiries, estimates, or press questions: email us and we will reply within one business day.