A handwritten page from a merchant's ledger, Pittsboro, 1832

Kodak's accounts-payable ledger, 1919–1928

John Carlin's account book (Metropolitan Museum of Art)

gnstudio

I know the business.
I build it myself.

Since 2006 I have worked on Dynamics NAV and automotive DMS projects, taking each one from requirements analysis through design, development and go-live. Today I build AI systems that answer questions about that ERP data in plain language, and people use them in their daily work.

Email me

A career
in numbers

25: years of development and consulting since 2000
19: years of Dynamics NAV · Business Central, since 2006
4.5: years running ERP and IT for a German subsidiary
6: countries worked in outside Korea: Germany, Indonesia, the Philippines, France, the Netherlands, Italy

What I can take on

ERP–LLM integration

A Hollerith punched card, 1895. The first format in which a machine read business data

I build AI interfaces that answer plain-language questions from the business data in Dynamics NAV and MSSQL. I do the whole job myself: learning what people ask and how the ERP data is structured, then designing the queries, building the screens and rolling it out on site.

Dynamics NAV · Business Central

Implementations, version upgrades and extension development. I have added features built for Korean and overseas sites, such as electronic tax invoices, quality control (QC) and bank integrations.

Automotive DMS (incadea)

A Volkswagen 1500 on a showroom floor, 1960

Implementation, branch rollouts and integration with manufacturer systems for imported-car dealer management systems. I was lead consultant on the Audi Volkswagen Korea project and on Inchcape's Indonesia and Philippines projects.

Custom business systems

A woman keying 1940 US census cards on a Hollerith pantograph punch — A punch operator keying 1940 census cards

Planning, architecture, implementation and operations, with one person responsible from start to finish. Most recently a real-estate listing manager; before that, sales-information, EDI and VAT systems in Java and Node.js.

Selected work

ERP–LLM integration for a fragrance manufacturer

gnstudio, 2025–

ERP data is accurate, but the people who need a number rarely get it quickly. I connected Dynamics NAV and MSSQL to LangChain and Chainlit and built an interface that answers a plain-language question with the exact ERP figures. I handled it alone, from planning to implementation. It runs in daily use.

incadea DMS for Inchcape Indonesia and the Philippines

incadea Korea, 2023–2025

A new incadea DMS implementation for the Indonesian and Philippine subsidiaries of the automotive distributor Inchcape. As lead consultant I handled requirements analysis, DMS configuration, data migration, integration with manufacturer systems and go-live support.

Electronic tax-invoice extension for NAV

2H Consulting, 2019–2023

So that Korean companies on Dynamics NAV could issue National Tax Service e-tax invoices from inside the ERP, I built an extension integrated with the Popbill API and deployed it at client sites. In the same period I upgraded Guerbet Japan's NAV and built a Business Central QC extension app.

One person, start to finish

I started as a developer in 2000. I first worked with Dynamics NAV in 2006 and have not left ERP work since.

In Germany I ran a subsidiary's ERP and IT alone for four and a half years. That is where I learned that in a small organization, the person who plans, the person who builds and the person who runs it have to be the same person, or the work never finishes.

From 2013 I implemented dealer management systems in Korea and Southeast Asia. From the first requirements meeting to data migration and go-live, I was always on site.

Today I make the data sitting in ERP systems answerable in plain language. The question box on this page is a small version of that.

KC Yang (양광철)

Founder, gnstudio

kcyang@gnstudioo.com Email me