Launching pad for in-house ERP development — ERPNext.JP source package
ERP development in-house by purchasing source code is possible thanks to open-source ERP. We offer a package including the complete ERPNext source code (compliant with Japanese business practices), test code, and ongoing support. A launching pad for companies that find it difficult to build from scratch.
Because it's an open-source ERP, you can purchase the source code.
ERPNext is an open-source ERP system. Its source code is entirely publicly available—which means you can purchase the source code and freely develop it as your own core system. This is a unique option only possible with open-source ERP, something impossible with closed SaaS solutions.
"We want to develop our own ERP system, but we don't know where to start." "I'm interested in open-source ERP, but building one from scratch is realistically difficult." "We have Python engineers in-house, but we don't have the resources to develop the business logic for our ERP system."
In recent years, there has been a definite increase in the demand for companies to control their core systems in-house.
SaaS price increases, vendor-driven modification schedules, and limitations on customization—all stem from the instability of entrusting the core of your business to others.
The decision to "do it in-house" is perfectly reasonable. The problem lies in the fact that that first step is too difficult.
What happens when you start from scratch
The concept of developing an in-house ERP system is correct in itself. However, starting from scratch can be much more challenging than you might imagine.
| Wall | Content | Estimated Period |
|---|---|---|
| Technology Selection | Framework, DB design, authentication, access control, workflow | Several months |
| Business Logic | Implement inventory management, purchasing, sales, and accounting to a practical level | Yearly |
| Operational Infrastructure | Development environment, production environment, deployment, backup | Several months |
Six months have passed and the Proof of Concept (PoC) is still not finished. Time is just being wasted on requirements definition discussions. These kinds of cases are not uncommon.
Even with the desire to "do it in-house," taking that first step is incredibly difficult. This is the biggest reason why many companies are hesitant to develop their own ERP systems in-house.
Why not start from a "moving state"?
Now, try changing your perspective a little.
What if you had the source code and environment of an already running ERP system at hand?
Inventory management, purchasing, sales, and accounting are all operated in accordance with Japanese business practices. The software is fully functional, capable of handling practical tasks such as calculating consumption tax, generating reports, and featuring a Japanese user interface.
Starting from there, we customize it to suit our company's operations. Add necessary features. Remove unnecessary features. Change the screen. Change the logic.
Instead of designing and manufacturing rockets from scratch, Get into a rocket that's already ready to fly and steer it in the direction you want to go.
This is the concept behind the ERPNext.JP source package.
What you can get
We offer the following four things:
🏭 Source code and environment honed through practical experience
We will provide you with the actual system that ERPNext.JP has built and operated. This includes the application built on the Frappe framework, customized settings, and adjustments for Japan.
This is not "sample code" or a "reference implementation." This is code that has been used in actual work, where problems were encountered, fixed, and improved. The reliability of code written in a theoretical setting is completely different from that of code that has been tested in a real-world environment.
Since I have all the source code at hand, there are absolutely no black boxes. You can make the necessary changes for your company while checking the functionality and reading the code.
Productivity of the Frappe framework
By simply defining the DocType (data model), CRUD screens, REST APIs, and permission management are automatically generated. Since there's no need to build the ERP "framework" from scratch, you can focus on your company's business logic.
🐍 Open Source × Python — The Optimal Solution for the AI Era
ERPNext is open source. The real value of having the source code publicly available lies in being able to understand what's inside.
Why is this process running? Where is this data coming from? It's all written in the code.
Furthermore, ERPNext is written in Python and JavaScript. We often hear from prospective customers that "it's easy to get started with because it's Python." Compared to Java or C#-based ERP systems, the code is easier to understand, and if you have someone in-house who can write Python, you can start customizing it right away.
And because it's open source, it's very compatible with AI. The code is fed to the AI to understand its structure. Instructions such as "I want to add this function to this screen" are then given to generate the code. This type of usage is only possible because you have the source code at hand. It's absolutely impossible with SaaS.
For specific examples of development utilizing AI, In the age of AI, ERP systems are shifting from being "bought" to being "built." We explain it in more detail there.
🛡️ Test Code — How to Use AI Safely
When having AI write code, the scariest thing is the case where it appears to be working, but in reality, it's breaking existing processes. Human reviews alone inevitably lead to oversights.
The ERPNext.JP source package includes a set of test code that covers core business functions such as accounting, inventory, sales, and purchasing. By running tests before committing AI-generated code, you can detect changes that could break the foundation in advance. If the tests fail, you can simply revert to the AI and have it fix it.
Test code plays a brake role in AI development. This will create a system that allows us to use AI proactively, yet safely, rather than using it with trepidation. Writing tests from scratch alone would require a considerable amount of effort, but that's already taken care of.
🤝 Partnering with the team that knows ERPNext best in Japan
It's not simply a matter of handing over the source code and being done with it.
To manage this in-house, you need to understand the conventions of the Frappé framework and the design philosophy unique to ERPNext. There are many aspects that are difficult to grasp just by reading the English documentation, and there are quite a few "landmines you encounter in practice" that are not written in the official documentation.
The ERPNext.JP operating team is comprised of members who are most familiar with ERPNext in Japan. They have a track record of contributing to the Japanese translation of the ERPNext core system and have over two years of experience operating it in a real-world environment. Based on this expertise—a code-level understanding, experience in applying it to Japanese business practices, and deep knowledge of the Frappé framework—we will support your company's in-house AI development in a hands-on manner.
"I had the AI write this code, but is it correct?" "Will this design approach allow us to scale in the future?" —I want to be there for you in situations where such decisions need to be made.
Terms of Use
There is one important rule.
This source package is for internal use only.
We prohibit the resale of purchased source code to other companies, or the use of that source code to implement ERP systems for other companies as a system integrator.
Why is it limited to internal use only?
The reason is simple: to protect the value of the source material. This product is designed for companies that are serious about bringing their production processes in-house, and we value that direction.
This is suitable for the following types of companies
- We have an IT department and want to control our core systems in-house.
- I'm dissatisfied with the limitations of customization in SaaS and packaged products.
- Can write Python code (or willing to hire and train people who can write Python code)
- We are interested in developing our own ERP system, but it is difficult to secure the resources and time to start from scratch.
Conversely, if you want us to handle everything for you, this plan is not suitable. This is a launching pad for companies that are willing to nurture their own growth.
Inquiry about source packages
Questions such as "Will it suit our business operations?" and "How much customization will be needed?"
Why not start with a 30-minute online consultation?
Related Articles
- What is Open Source ERP? A thorough comparison of its mechanisms, benefits, and five major products. - In the age of AI, ERP is shifting from "buying" to "creating" — the shortest route. - Why choose open-source ERP? - ERPNext.JP Cloud Implementation Cost Guide