Custom ERP and business systems for companies operating in Korea

A company operating in Korea often sits between two ways of working. Headquarters reads reports in English and has its own approval rules; the team in Korea works in Korean and keeps Korean records, from e-tax invoices to HR files. The teams that come to us usually recognise themselves in one of these situations.

• A Korean subsidiary or branch of a foreign company, reporting to headquarters in English while local staff work in Korean.
• A foreign-owned company in Korea that has outgrown spreadsheets, email approvals and shared folders.
• A company running a global ERP that needs a Korean-side system for the local records, invoices and approvals it does not cover.
• A Korean team that needs an internal tool shaped around how it actually works: quotes, orders, projects, schedules or requests.

We build the modules your company uses and leave out the rest, so people see the screens they need and nothing else. Each module is scoped in the consultation and written into the quote. Typical parts are below.

• Sales: customers, quotes, orders and contracts, with the document you send generated from the record.
• Purchasing and inventory: suppliers, purchase orders, stock in and out, and the reports headquarters asks for.
• Projects and schedules: milestones, tasks and files per project, with progress visible to the people who need it.
• HR and approvals: staff records, leave and expense requests, and approval lines that follow your rules.
• Invoicing: Korean e-tax invoices issued from your records through a provider's API.
• Dashboards and reports in English for headquarters, from the same data the Korean team enters.
• A client or partner portal where outside parties see their own quotes, contracts, schedules and documents.

Packaged Korean ERP and HR software is built for Korean users first, and global ERP rarely connects to Korean e-tax invoicing without extra work. We build the system around the split: each person works in their own language on the same records, and reports for headquarters come out in English without anyone re-typing them.

Language is set per user and per screen. Field labels, menus, status names and notifications follow it, while the data itself, such as a Korean company name or address, stays as entered. Where overseas staff need it, we store the English form of a Korean address alongside the Korean one.

A system used in Korea has to handle a few things the Korean way. These are the parts we connect most often.

• e-Tax invoices

  Electronic tax invoices issued from your sales records through a provider's API, or prepared for your Hometax workflow.

  Korean e-tax invoice APIs→

• Korean addresses

  Road-name address search through Juso or Kakao Postcode, stored in one consistent format.

  Korean address search→

• KakaoTalk notices

  AlimTalk messages to customers when an order, booking or payment changes, through one of Kakao's official dealers.

  KakaoTalk Channel and AlimTalk→

• Access and records

  Roles and permissions per screen, and a login history, so personal data is seen only by the people who need it.

• Korean holidays and time

  KST (UTC+9) timestamps and the Korean public holidays that affect schedules, such as Seollal and Chuseok.

Our quotes, contracts, schedules, documents, maintenance requests and settlements run on a system we designed and built: an admin for us and a client portal for each client, on one database. When a client sends a project request, the portal opens for them, and from then on they follow the quote, contract and schedule there.

For TTJO Consulting we built a quote automation flow in which requirements go in, AI analyses them and a draft quote comes out for a person to check. The same approach, AI drafting and a person approving, fits many ERP tasks such as classifying requests or preparing documents.

TTJO · quote flow

Packaged software is quicker to start when your process matches it. A custom system pays off when the process is what makes your company different, when two languages have to work on the same data, or when several tools need to become one.

• Packaged Korean ERP

  Korean accounting and HR conventions out of the box, with screens built for Korean users.

• Global ERP

  Headquarters' standard; the Korean entity's local records and e-tax invoices usually need extra connection work.

• Custom system

  Built around your workflow and languages, connected to the tools you keep, and extended as you grow.

• Both

  Keep the global ERP for group finance and add a Korean-side system that feeds it.

Most systems we build replace something: spreadsheets, a shared drive, an older internal tool. We look at the existing files and data first, agree what moves into the new system and in what shape, and plan the switch-over with you so the team is not working in two places for longer than necessary.

Taking over an existing codebase works the same way. We inspect the code and materials, then define in the quote what we keep, change, migrate or rebuild.

English-speaking founder, written-first communication across time zones, and meetings in person when you or your team are in Korea. Workflow discovery, integration or training on site in Korea is agreed before the visit. We can invoice in US dollars or receive an overseas transfer.

The price follows the modules, integrations and data migration the system needs, so each project is quoted from its own scope. In the estimate tool, choose the business-system type and the features you need to outline that scope; after a consultation you receive a formal quote listing the deliverables.

We can invoice in US dollars. VAT (10%) is added on top, hosting is billed separately from the build, and third-party costs such as KakaoTalk messages and AI usage are billed at cost. Payment is split into a deposit, interim and final payments, with the ratio written into the contract.