STEP 01
AI code analysis
AI analyzes your existing source code and visualizes program structure, dependencies and data flow.
AI × Legacy Migration
Use AI to see inside black-box legacy systems
COBOL, VB6, Access: when specifications are missing and no one can see the whole system, we combine AI analysis with reviews by experienced engineers to modernize it safely and efficiently.
- Japanese subsidiary (Ebisu, Tokyo)
- Founded in 2016
LEGACY — COBOL
IDENTIFICATION DIVISION.
PROGRAM-ID. CALC-INVOICE.
PROCEDURE DIVISION.
PERFORM READ-ORDER UNTIL EOF.
COMPUTE WS-TOTAL = WS-QTY * WS-PRICE.▼ AI analysis & conversion + engineer review ▼
MODERN — Java / Cloud
public Invoice calculate(Order order) {
return order.lines().stream()
.map(l -> l.qty() * l.price())
.reduce(0L, Long::sum);
}Problem
Does this sound familiar?
Has the core system you have relied on for years become a drag on the business?
No one inside or outside the company can maintain COBOL, VB6 or Access
Specifications are missing or outdated, so the system has become a black box
Staff have left or moved on, and no one can explain what the code does
Maintenance and operations eat most of the IT budget, leaving nothing for new investment
You want to migrate, but the cost and the risk of stopping operations hold you back
Cloud adoption, data use and other DX initiatives stall because of the existing system
Up to ¥12 trillion a year
The economic loss projected from 2025 onward if legacy systems are left as they are. The so-called "2025 Digital Cliff" is already a real management issue.
Source: Ministry of Economy, Trade and Industry (METI), "DX Report: Overcoming the '2025 Digital Cliff' Involving IT Systems and Full-fledged Development of DX" (September 7, 2018)
Solution
AI speeds up everything from reading the code to migrating it
AI greatly shortens the code reading and specification work that used to take people months. The hours saved go into verifying quality and understanding your business.
STEP 02
Automatic specification generation
We extract business logic from the code and document it as design documents and specifications.
STEP 03
AI code conversion
AI efficiently rewrites your code into modern languages such as Java, C# and TypeScript, and for cloud environments.
STEP 04
Generated tests & old-vs-new comparison
We generate test cases automatically and compare the outputs of the old and new systems, guaranteeing the same results as before migration.
We never leave it all to AI. Engineers with experience building systems for Japanese clients review every AI output, and our ISTQB-certified QA team safeguards quality.
Coverage
Supported migration patterns
These are typical patterns. Feel free to ask about languages and environments not listed here.
| From (legacy) | To (modern) |
|---|---|
| COBOL / PL/I | Java (Spring Boot) |
| Visual Basic 6.0 / VBA | C# (.NET) / web application |
| Microsoft Access / Excel macro workflows | Web system + RDB (PostgreSQL / MySQL) |
| Older PHP / Java / .NET Framework versions | Latest versions and frameworks |
| On-premises environments | AWS / GCP (cloud migration) |
Process
How we work
Start small and assess the risk first. We move step by step, so you never have to make a big investment decision up front.
- 1
Free consultation
60 min online
We hear about your current system and its challenges.
- 2
Free legacy assessment
About 2 weeks
AI analyzes part of your code, and we report the migration difficulty and a rough estimate.
- 3
Pilot migration
1–2 months
We migrate selected functions or modules first to validate quality and approach.
- 4
Full migration
Depends on scale
We migrate in phases and guarantee behavior with old-vs-new comparison testing.
- 5
Operations & maintenance
Ongoing
We stay with you for improvements, new features and maintenance after migration.
Why Haposoft
Why companies choose Haposoft
As an offshore development partner whose business is 85% with Japanese companies, we remove the worries about language, quality and speed.
01
Faster and lower-cost with AI
AI is built into every stage (analysis, documentation, conversion and testing), cutting effort compared with traditional, mostly manual migration. Our Vietnam development center keeps costs down.
02
Communication in Japanese
Our Japanese subsidiary in Ebisu, Tokyo is your point of contact, and PMs and POs with work experience in Japan run the project. From aligning requirements to reporting, we work in Japanese.
03
Certified quality and security
We are ISO 9001 and ISO 27001 certified. PMP, PSM II and ISTQB certified professionals uphold the quality of project management and testing.
04
One stop, through to after migration
We handle everything from requirements, design and implementation to AWS/GCP cloud build-out and post-release maintenance. Migration is not where we stop.
Case Study
Replacement and modernization track record
Representative Haposoft projects in reading and rewriting existing systems.
Rebuilt an end-of-support business system on modern technology
- Challenge
- A legacy business system for a jewelry and precious-metal buying business kept running on end-of-support technology without SSL, making maintenance and new features difficult.
- Approach
- We rebuilt the system on modern technology while keeping the existing business flow, and migrated the existing data safely.
- Scope
- Analysis of the current system, rebuild of the admin screens (master data, deals, rankings, permissions), data migration, testing and release
Reviewed the server architecture and rebuilt the code
- Challenge
- The design and code quality of the existing server side were blocking new features.
- Approach
- After reviewing the architecture, we rewrote the server-side code and added APIs and admin features. We also introduced automated testing with TDD.
- Scope
- Design (including UI/UX), development, CI/CD, maintenance
Security
Concrete safeguards for entrusting us with your source code
ISO 27001 certified
We manage your assets under an information security management system.
Starts with an NDA
We sign a non-disclosure agreement from the free assessment stage, and the code you share can be kept to a minimum.
Support from our Japan team
Members of Haposoft Japan Co., Ltd. (Shibuya, Tokyo) can support you in Japan, from the first consultation through the project.
FAQ
Frequently asked questions
Yes. We start by analyzing the source code with AI, extracting the business logic and writing the specifications. You can also ask us for the specifications only.
Besides signing an NDA, we can limit the scope of analysis or work in an environment you specify. Tell us the details when we talk.
We never deliver AI output as is: engineers review all of it. Tests that compare the processing results of the old and new systems then confirm they behave the same.
It depends on the system's size, languages and migration scope. The free legacy assessment gives you the migration difficulty and an estimated cost.
Yes. We can share roles with your existing vendor and propose a phased migration that keeps operations running.
Start by understanding where your existing system stands
Free legacy assessment: AI analyzes part of your code, and we hand you a report on migration difficulty, risks and estimated cost.
ISO 27001ISO 9001AWS Select Partner
Service overview: a document covering our services, approach and team, for your internal review.