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Never 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.

Talk about development From requirements to delivery See our work Past production and development

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.”

Discuter d’un projet

  • 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.

Talk with us — no pressure

See what we care about

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.

Discuter d’un projet

  • 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.

Browse services

  • 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
    View details

  • Business systems

    Make everyday work
    run more smoothly.

    • Discovery and requirements
    • Usable UI/UX design
    • Updates and system integration
    • Operations and maintenance
    View details

  • 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
    View details

  • Mobile apps

    Anytime, anywhere —
    closer to people.

    • iOS and Android
    • Integration with external systems
    • Push, location, and payments
    • Store submission and support
    View details

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.

Get a free consultation See how consulting works

Process

Flow

Peace of mind from day one. From planning to delivery, we work with you using AI technology too.

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

Demander un devis Choisissez vos besoins et estimez un budget Contact Questions et consultations

Actualités

News

Les dernières informations et annonces sur l’IA et le développement de systèmes.

Voir tout