Ninja System
Mobile Apps · Web Systems · Automation

App and web system development for small businesses

Start small, matched to your workflow. NinjaSystem supports Flutter, Android, Web, and business automation development from requirements planning to implementation and improvement.

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Business dashboard for small business web system development shown on PC and smartphone
First Step

We organize uncertainty into a small first step

If the idea is still rough or daily work is spread across spreadsheets, email, chat, and manual steps, we help clarify the scope before building.

Want to build an app or web service but do not know what to decide first

Need to organize features, budget, and schedule before outsourcing

Want to turn spreadsheet-heavy work into a small web tool

Need to automate an existing workflow without forcing a large system

Want to try AI or APIs but are unsure what fits the real work

Services

Practical development for the scope you need

From MVP planning to mobile apps, web systems, automation, and AI/API use, each support area is kept realistic and small-start.

Requirements / MVP

MVP Planning

Clarify the goal, required features, screen roughs, priorities, and development steps.

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Flutter / Android

Mobile Apps

Support for practical smartphone apps, Firebase integration, notifications, and store release preparation.

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Admin / API / Web

Web Systems

Small web systems, admin screens, APIs, and lightweight cloud setups for operation.

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Sheets / CSV / Workflow

Automation

Turn repeated manual work into small internal tools, dashboards, reminders, and CSV flows.

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PoC / API Integration

AI / API

Try AI/API use in realistic ways, such as simple PoCs, summaries, classification, or integrations.

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Dashboard image for turning manual work into a small web system
Business Automation

Turn spreadsheets and manual work into usable web tools

We develop small internal tools for CSV import/export, dashboards, reminders, data management, and repeated workflows. The goal is not to overbuild, but to start with the part that helps daily work.

Before Information is scattered across spreadsheets, email, chat, paper, and repeated manual copying.
After A small web tool centralizes input, checking, aggregation, and notifications for the workflow.
Improve Start with the smallest useful scope, then improve after real use reveals what matters.
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Mobile / Web

Apps and web systems designed for the actual use case

Smartphone apps, admin screens, web systems, and API integrations can be combined based on users and operations. Flutter, Android, and Web are selected where they fit.

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Multi-device image for Flutter apps and web systems on PC and smartphone
Process

From consultation to post-release improvement

The process starts with hearing and scope organization, then moves through proposal, design, implementation, release, and improvement as needed.

Contact

Share the current situation, goal, rough budget, and timing.

Hearing

Organize the users, workflow, required features, and constraints.

Proposal

Clarify MVP scope, direction, estimate base, and project steps.

Build

Design screens, implement, test, and prepare for release or operation.

Improve

Review post-release use and support practical improvements.

Process diagram for consultation, planning, development, and operation support
Security / Operation

Designed with operation, security, and limits in mind

Permissions, backups, logs, data handling, and post-release improvements are considered from the beginning. Some high-risk or large-scale areas may be outside scope depending on the project.

  • Permissions
  • Backups
  • Logs / monitoring
  • Data handling
  • Post-release improvement
  • Scope limits clarified
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Image of permissions, backups, and operation monitoring for web system development
Products / Works

In-house products also support our development practice

NinjaSystem plans, designs, implements, releases, and improves lightweight apps such as Calclab, QR Guard, and Tabijitaku.

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GlassWatch

World clock, timers, stopwatch, focus sessions, alarms, widgets, and settings in one time management app.

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COMING SOON Store release in preparation
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Hirari

Hirari is a book discovery app that helps users find daily reading candidates using book information from Rakuten Books.

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COMING SOON Store release in preparation
Contact

You can consult before requirements are fixed

Idea-stage discussions, pre-outsourcing organization, and existing workflow improvement consultations are welcome. Share the current situation first.

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