Founder · KIOX

A developer who knows the shop floor
is building KIOX

Lee Kyeong-yong Founder of KIOX · MAGICPOS

Starting at the checkout counter, I have designed and built POS and retail management systems myself for more than 30 years. From COBOL through VB6 and VB.NET to C#, WPF and .NET 8, I rebuilt the same business on each new technology, and recently expanded into semiconductor equipment integration (SECS/GEM, RabbitMQ). I am putting all of this into KIOX, and I am looking for partners to grow it with.

Partner with us kyeongyong.lee@gmail.comsmgpos@hanmail.net
30+ yrsBuilding POS and retail systems
200+Stores running a PC POS I built
7 yrsBuilding and running systems in Vietnam
18Major projects (many as PM)
01

Core strengths

Not just software: I make the work of a store actually run.

Field

Real operations into systems

I have lived and built the flows of checkout, stock, purchasing and settlement. I look first for the business reason behind each requirement.

End to end

From plan to operation

I have done planning, development, packaging, installation and support myself, and led many projects as PM.

Migration

Technology migration

I moved the same product from COBOL → VB6 → VB.NET → C#/WPF. I fix running legacy systems while designing the new structure.

Package

Packaging

I turned single-store software into a chain package configured per industry and number of stores.

Global

Localization

In Vietnam I localized mart, canteen and in-house package systems into Vietnamese and English and ran them for many clients.

New tech

New technology

I apply SECS/GEM equipment communication, RabbitMQ messaging, Kafka and AI development tools to real work.

02

Technology journey

~2000COBOL · ECR cash registersRetail POS operation, PC POS package — SONATA
2000–2013VB6 · VB.NET · MS-SQL · ACCESSRetail POS and management in Korea, E-LAND EFMS POS, NICE VAN integration
2013–2021VB.NET · C# · MS-SQLMart and canteen POS in Vietnam, in-house MAGIC POS package, mold management
2021–2025C# · WPF · VB6 · TCP/IP · HTTPSOnline messaging, POS and kiosk for BYC and Lotte Data Communication, restaurant POS
2025.06–2026.09SECS/GEM · RabbitMQSemiconductor equipment EAP, CIM–MES messaging
2025.07–present.NET 8 · WPF · ASP.NET Core · SQL ServerKIOX platform: POS, back office, central server
LearningApache Kafka · AI development toolsHigh-volume real-time messaging, AI-assisted development
03

Career

13 years of retail POS in Korea → 7 years in Vietnam → POS and kiosks for large clients → semiconductor equipment

2025.07–present
KIOX POS platform
MAGICPOS · Founder
.NET 8 · WPF · ASP.NET Core · SQL Server
Planning · Development
2025.06–2026.09
EAP · SECS/GEM · CIM–MES integration
Ainspace · Development advisor (freelance)
SECS/GEM · RabbitMQ
Semiconductor
2024.09–2025.02
Restaurant POS and KIOSK
Aliex
C# WPF · VB.NET · MS-SQL · VS2022
Development
2023.07–2023.11
Kiosk voice guidance for accessibility
Winwiz (Lotte Data Communication)
C# WPF · MS-SQL · VS2019
Development
2022.10–2023.03
Integrated barcode payment
Winwiz (Lotte Data Communication)
VB6 · MS-SQL · HTTPS
Development
2022.02–2022.07
BYC POS upgrade
Winwiz (BYC)
C# · MS-SQL · TCP/IP Socket
Development
2021.09–2021.12
National Health Insurance (Korea): online messaging
Certiware
C# · MS-SQL · JSON
Development
2021.07–2021.08
HJ POS Package 1.0
HYOJUNG SOFTTECH
VB.NET · C# · MS-SQL
PM · DevelopmentVietnam
2021.05–2021.06
KIDO Sports mold management
KIDO Sports
VB.NET · MS-SQL
PM · DevelopmentVietnam
2021.01–2021.03
Mart chain POS system
Sky Mart (Ho Chi Minh City)
VB.NET · MS-SQL
PM · DevelopmentVietnam
2015.11–2020.12
MAGIC POS system
THE MAGIC · in-house package
VB.NET · C# · MS-SQL
PM · DevelopmentVietnam
2015.07–2015.10
Canteen shop management
Welstory Vietnam
VB.NET · MS-SQL
PM · DevelopmentVietnam
2013.12–2014.06
Mart chain POS system
K-MART VIETNAM
VB.NET · VB6 · MS-SQL
DevelopmentVietnam
2012.11–2013.11
Wholesale and retail POS & Management
Flower Mart
VB6 · VB.NET · MS-SQL · NICE VAN
Development
2011.10–2012.10
Wholesale and retail POS & Management
Hyundai Deco
VB6 · VB.NET · MS-SQL · NICE VAN
Development
2010.01–2010.06
EFMS POS
Winwiz (E-LAND)
VB6 · MS-SQL
Development
2000.12–2009.12
POS & Sales Management
SMG
VB6 · ACCESS
Development
~2000
PC POS package (COBOL)
SONATA
ECR → PC POS · COBOL
Development · Packaging200+ stores
04

Key projects

2025.06–2026.09 · Ainspace

Semiconductor EAP · CIM–MES

  • Built the EAP linking semiconductor equipment to host systems over SECS/GEM
  • Built RabbitMQ messaging between CIM and MES
  • Preparing Kafka for high-volume, real-time processing
2022–2025 · Winwiz · Aliex

POS and kiosks for large clients

  • Lotte Data Communication: kiosk voice guidance for accessibility
  • Lotte Data Communication: integrated barcode payment (VB6, HTTPS)
  • BYC: POS upgrade (C#, TCP/IP socket)
  • Restaurant POS and kiosk (C# WPF, VB.NET)
2013–2021 · Vietnam

MAGIC POS package and local rollouts

  • MAGIC POS, 5 years: PM and development, Vietnamese and English localization
  • Mart chain POS for K-MART VIETNAM and Sky Mart
  • Canteen shop management for Welstory Vietnam
  • HJ POS Package 1.0, KIDO Sports mold management
~2013 · Retail in Korea

Retail POS and head-office management

  • SONATA: COBOL PC POS package in 200+ stores nationwide
  • SMG: POS & Sales Management, 9 years
  • E-LAND: EFMS POS terminal features
  • Wholesale and retail POS for Hyundai Deco and Flower Mart, NICE VAN payment integration
05 · 2025.07–present

What I am building now: KIOX

Store POS, back office and central server, redesigned on .NET 8 from 30 years of POS and retail experience, built with AI tools at every step.

KioxPos

Store terminal

C# WPF · retail and restaurant checkout, table and kitchen printing, self-service kiosk

Handy

Staff phone ordering

Web server built into the POS plus a phone web app · order, add, cancel, device approval

KioxMan

Back office

ASP.NET Core API + WPF · products, purchasing, stock, sales, ledgers, settlement

Center

Central server

Store licenses and plans, automatic update delivery

01

A database per client

Master, transaction, customer and admin databases are separate, so one store can never reach another store's data.

02

Signed licenses

Central responses are verified with RSA signatures and device counts are managed. Stores keep selling for a set period even offline.

03

Automatic updates

Signed packages flow central → store server → POS, with a backup before applying and automatic rollback on failure.

04

Ledger-based stock and receivables

Balances are computed from the ledger, not stored, so back-dated entries never break the numbers.

05

Restaurant reality

Locking and merging so phones and the counter can edit the same table without conflicts. Kiosk dine-in or takeout choice.

06

5 languages

Korean, English, Vietnamese, Chinese and Japanese, with Vietnam localization experience built in from day one.

06

How I build with AI

I use AI not just to generate code, but as a colleague that reviews designs and verifies results with me.

Requirements and designTurn field needs into specs and find conflicts with the existing structure early.
Legacy analysisRead VB6 and VB.NET era schemas and code to find and reuse existing columns and structures.
Development and refactoringWrite screens, APIs and SQL together and check them right away with builds and tests.
VerificationRun against real databases and real store setups, and write down pitfalls and decisions.
Deployment and supportBuild install scripts and check tools, and diagnose remote store issues together.
Example: when adding dine-in/takeout to the kiosk, we caught at the analysis stage that a new column would break sales uploads, and instead reused a column already in the old schema, with no schema change.
07

Looking for partners

KIOX aims to be a POS that runs end to end inside the store. Together we can go further.

Sales

Sales and installation partners

Resellers who introduce KIOX to local stores and handle installation and support. Install kits and remote updates keep on-site work light.

Vietnam

Partners in Vietnam

Sales and support for F&B and retail stores in Vietnam. Five languages and Vietnamese e-invoicing are already in place.

Integration

Development and integration partners

Companies and developers to build payment (VAN, QR), delivery app, device, printer and accounting integrations with us.

Let's talk

Partnership proposals, rollout questions, collaboration ideas: send me an email.

Lee Kyeong-yong

kyeongyong.lee@gmail.comsmgpos@hanmail.net
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