IPA alert on unauthorized access: three checks Japanese SMEs should run now
What IPA’s October 2026 alert asks companies to inspect after a wave of breaches—public apps, external services, held data—and how to harden systems.
자세히 보기Never stop evolving.
Leave design and systems with us, starting with AI
We focus on system development using generative AI, RAG, and AI agents, and also take on web services and business systems. From adding AI to existing systems to launching new services.
Make daily work simpler. We support your growth with AI.
-
Streamline your internal systems
We develop and improve web systems tailored to your daily operations, including attendance, inventory, customer management, delivery management, document output, and admin dashboards.
Adding AI can further improve your operations. -
Launch your own service
We bring new services to life, such as booking sites, matching services, membership sites, and shopping sites.
Adding AI can also make the service more innovative.
About us
About us
I want to be a trusted development partner
who turns ideas into reality.
Makoto Tejima is a sole proprietorship where an engineer with over 20 years of experience handles planning, design, development, and operations end to end. Across AI, web systems, mobile apps, and more, we have delivered many projects. We carefully face each client’s challenges and vision, and support business growth with technology.
From websites and web systems to mobile apps and AI-powered features, I propose the best fit for your goals.
If you are interested, feel free to reach out via “Discuss a project.”
-
20+ years
Experience
Proven quality
backed by deep experience -
60+ companies
Clients
Working with companies
of all sizes and industries -
200+ projects
Projects
From planning to operations
across a wide range -
95%+
Retention
Building lasting
relationships
-
Direct consultation & support
The same engineer takes responsibility from start to finish.
-
Flexible and fast
From small builds to complex systems, we move quickly and flexibly.
-
Partnership that lasts
Not done at delivery — continuous support through operations and improvement.
-
AI Development
We propose AI solutions tailored to your goals, from adding new features to improving operational efficiency.
-
Web System Development
We build easy-to-use, easy-to-maintain systems tailored to your operations, including booking, membership, and admin dashboards.
-
Mobile App Development
We develop iPhone and Android apps, including membership and notification features integrated with web systems.
-
Website Production
We build corporate sites, service sites, landing pages, and recruitment sites designed to drive inquiries and customer acquisition.
Make the difficult,
simple.
Is system development really that difficult?
Difficulty
Do you feel that system development is difficult?
Many people who come to us for consultation say things like "we lost contact with our developer" or "the system we got wasn't what we expected."
Having worked in this industry for a long time, the solution is simple: align understanding in meetings and put it in writing as documentation (specifications).
This is standard practice in other industries, but in the IT industry this step is very often skipped. Doing this step properly improves the following:
AI can support the creation of that documentation, as well as the development work that follows.
-
Lack of communication
Misunderstandings and missed information lead to trouble and rework.
AI Assist AI automatically organizes meeting notes and key points to prevent misunderstandings.
-
The system turns out different than expected
After completion, clients often find "this isn't what I imagined," leading to extra costs and delays.
AI Assist AI visualizes and compares requirements, helping catch discrepancies early.
-
That's why we create documentation
Clarifying requirements and specifications in documentation helps align understanding and stabilize quality.
AI Assist AI supports documentation creation, improving both quality and efficiency.
Services
Service
Got an idea?
Let's build it together.
From AI to business systems, web, and apps —
we turn what you want to create into reality.
-
AI / Generative AI
Push business forward
with the power of AI.- RAG and in-house data
- AI agent development
- Workflow automation
- AI inside existing systems
-
Business systems
Make everyday work
run more smoothly.- Discovery and requirements
- Usable UI/UX design
- Updates and system integration
- Operations and maintenance
-
Web services
Bring your ideas
to the world.- Custom services and company sites
- Planning and design included
- Servers and security
- Post-launch ops and improvements
-
Mobile apps
Anytime, anywhere —
closer to people.- iOS and Android
- Integration with external systems
- Push, location, and payments
- Store submission and support
Other areas we cover
See all areas-
AI / RAG
-
Database support
-
Payment systems
-
iOS / Android
-
System integration
-
Cloud setup
-
Security
-
Data utilization
-
Ops & support
The future you want to create —
let's build it together.
It's okay if it's not concrete yet.
Feel free to reach out first.
Process
Flow
Peace of mind from day one. From planning to delivery, we work with you using AI technology too.
-
Meeting
We start with a meeting to understand your needs, and will propose ideas ourselves if needed.
Supported by AI assistant
AI analyzes the meeting notes to help organize challenges and suggest the best direction for our proposal.
-
Contract
Once the requirements have taken shape through discussion, we sign a contract.
Supported by AI assistant
AI checks the contract contents to help detect risks and confirm unclear points.
-
Design
While listening to your requirements, we create the specifications that serve as the blueprint for the system.
Supported by AI assistant
AI organizes requirements and helps check for gaps in the design and suggest the optimal structure.
-
Development
We develop the design and system accordingly, making adjustments along the way if you have further requests.
Supported by AI assistant
AI visualizes development progress, supporting quality checks and more efficient code review.
-
Delivery
After you review the completed work and we make any necessary adjustments, we deliver the final product.
Supported by AI assistant
AI automatically organizes test results and documentation, streamlining the delivery process.
소식
News
AI·시스템 개발에 관한 최신 정보와 소식을 전해 드립니다.
California subpoenas OpenAI over AI cyber risk: what companies should check
California’s October 2026 subpoena to OpenAI over AI cybersecurity, the FTC inquiry, and the permission, monitoring, and human-review checks companies should make before connecting AI agents.
자세히 보기
Claude Opus 5.5 leads GPT-6 Astra in coding comparisons, with price in focus
An overview of Claude Opus 5.5 versus GPT-6 Astra on coding benchmarks, token pricing, and what businesses should check when choosing a model.
자세히 보기
Penzo has arrived on the site
Penzo, the guide for the Makoto Tejima site, is now on the pages. This note covers where Penzo appears and how future News images will match the same paint.
자세히 보기
さくらインターネット不正アクセス第三報を解説｜影響範囲と企業が学ぶべき点
さくらインターネットの不正アクセス第三報を整理。影響アカウント、初期パスワード、二次被害の状況、企業・開発者が押さえるべき教訓を解説。
자세히 보기
Anthropic researcher warns AI has “>10%” chance of killing all humans this decade
Anthropic Alignment Science Lead Evan Hubinger estimates more than a 10% chance AI could kill all humans within 10 years. Context, caveats, and takeaways for businesses.
자세히 보기