Systems that cut the work you repeat daily
First we talk and agree on what to cut. The demo website of that work is free. Click through it yourself, then decide whether to go ahead.
Jake Tae-moon Jo has built software since 2006 and has been CTO (head of technology) at five companies. He handles your work himself, from the first talk to the end. We reply within one business day.
Repetitive tasks that take time every day
Calculating replacement dates by hand in a spreadsheet
Writing contracts, receipts and checklists on paper
Filling in daily site reports on paper
Spending time on the same document work over and over
Spending time and energy on customer questions and meetings
Checking countless things by eye every day
How work done by hand has changed
Staff worked out each next filter replacement date by hand, scrolling down a spreadsheet.
The system works out the next replacement date for each unit. When a date is close, it emails the customer's contact person.
Contracts, receipts and checklists were handled on 9 kinds of paper forms.
When a technician finishes a visit on their phone, the job confirmation is created as a PDF.
Daily site reports were filled in on paper forms.
Daily reports are written on the web, and the site manager reviews and approves them on screen.
Rebuilding how work is done, with AI at its centre, is what we call AX (AI transformation).
What happens after you send a message
Message
Send it by Telegram, email or phone, whichever suits you.
Talk
We listen to how you work now and agree with you on what to cut first.
Free demo website
Click through it yourself to see how the work we discussed runs on screen.
Decide
You do not have to go ahead. If you do, we build the real system and help run it.
The demo works, but it is not the finished product.
LogicaJ's work
We have worked with clients in Korea, Vietnam and the United States.
Home appliance sales, rental and maintenance
Operations system shared by the office, technicians and customers
Instead of looking up the same customer once per unit, one search shows their units, contracts, visits and payments on one screen.
2026.05 – presentIn operation
General construction
Daily site report and project management system
We built web writing and approval for the paper daily reports; the client has finished acceptance testing.
2026.04 – 2026.07
Earned wage access financial service
Worker app and operations web app
2026.06 – present
Online marketplace
Network-based app for buying and selling second-hand goods and services
We built the iPhone and Android app, the admin web app and the server behind them.
2026.04 – 2026.10
Energy
Analysis model for the causes of swings in the power market
We built it to draft the cause memos people write by hand, with figures behind each point.
2026.08 – 2026.09
Film production
AI translator for feature film screenplays
Across 4 feature films, our own checks found 0 places where content not in the original had slipped in.
2026.09 – 2026.10
AI adoption assessment and policy
- AI adoption assessment
Manufacturing
2026.05 – 2026.06 - External AI use policy
Energy
2026.07 – 2026.08
Translation, web and app development
- Webtoon storyboard translator
Webtoons
2026.04 - Student portfolio web app for a tutoring academy
Education
2026.05
Work before 2026
- Delivery system linking a shopping-mall platform to couriers
E-commerce
2020.10 – 2021.12 - Online store order collection tool
E-commerce
2021.05 – 2021.06 - Training data preparation for a recommendation system
E-commerce
2021.01 - iOS apps and a Swift communication library
Mobile apps
2015.01 – 2016.11
Only projects we can disclose are listed here. We have also carried out many projects we cannot disclose. Clients are named by industry only, as our confidentiality agreements require.
The person you first talk to stays on the work to the end
Jake Tae-moon Jo
- Founded LogicaJ and works as its lead engineer.
- Has built software since 2006.
- Has been CTO (head of technology) at five companies.
- Set up an R&D centre in Vietnam from scratch and grew it to 50 people in 6 months.
- Has worked in Korea, Vietnam, Singapore and the US.
Lead engineer + role-based AI agent team
The lead engineer decides; AI agents, each with its own role, build and review.
DecidesLead engineerDecides what to build and when to release it.
BuildsAI agentsDesign, screen design, server, web screens, app, manuals
ReviewsAI agentsCode review, security review. Kept separate from the agents that build.
- We gather what we need to know in one pass and send it with options and a recommendation. In one project, the answers came back the next day and fixed what to build.
- When something is still open, we go ahead on the recommended option. We log it and have you confirm everything in one pass.
- We also write user manuals for each role.
The home appliance operations system passed all 1,263 of its automated tests (as of November 2026). These tests check that changing one feature has not broken anything else.
Frequently asked questions
Can I work with you if I know nothing about software development?
Yes. We talk about the work you do now, in plain words. When something needs deciding, we give you options and a recommendation.
How are cost and timeline decided?
After your first message, we settle the requirements through questions and answers. Once they are settled, we give you the cost and timeline before any contract.
Is the demo free, and can I say no after seeing it?
Yes. The demo website is free, and after clicking through it you do not have to hire us. There is no obligation to sign a contract.
Will our company's information stay confidential?
Yes. We keep what you entrust to us confidential, and sign a non-disclosure agreement (NDA) when needed.
Who owns the finished system?
You do. Everything we deliver, including documents and source code, becomes your property.
Who runs the system once it is built?
You can sign a separate maintenance contract, or run it yourselves, as the contract allows. If something goes wrong in operation, we respond as soon as possible.
Is LogicaJ responsible for a system the AI builds?
Yes. LogicaJ is responsible. The lead engineer decides what gets built and when it ships.
Do I have to replace the software I use now?
Not necessarily. In one project, work that other software already did, such as accounting, was left out of scope and kept as it was. Where an old management program was replaced, we moved the customer, contract and equipment records to the new system.
Can companies outside Korea work with you?
Yes. We have worked for companies in Vietnam and North America. From abroad, contact us by email or Telegram.