You can talk to us before requirements are fixed.
Guide: from ¥1,000,000 / 1–2 months|See pricing
System Development
Business System Development
New builds, rebuilds and ongoing development of business systems, web apps and LINE mini apps — right-sized, with the same team from problem framing to operations. Fixed-price when requirements are set, monthly when they are still moving.
Common Challenges We Solve
- We want to move spreadsheet or paper-based work into a system
- We built a system nobody uses, and people went back to spreadsheets
- Requirements are not fixed yet, and we want to decide while building
- Our current vendor only builds what is specified, and the system has become a black box
- We want an undocumented legacy system to be safe to change
Two Ways to Work With Us
Build what is already defined
When requirements and deliverables are fixed, we agree scope and price up front and take responsibility for completion.
- Moving spreadsheet or paper work into a system
- Rebuilding an existing system
- Adding integrations with external services
Decide together, keep building
For development where requirements move or systems keep improving after launch, we work monthly by days per week. We call this way of working Forward Deployed Engineering.
- Launching a new business or service
- Ongoing development of an existing system
- A second opinion on your current vendor
Services
Business System Development
We build optimized systems tailored to your business workflows, including inventory management, CRM, and order management. We also handle integration with existing systems and data migration.
- Workflow Analysis & Optimization
- Legacy System Integration
- Phased Implementation
- Maintenance & Operations Support
Web Applications
We develop browser-based applications including SaaS products, business web apps, and admin dashboards. Scalable architecture that grows with your business.
- React/Next.js/Vue.js
- Responsive Design
- Real-time Communication
- PWA Support
API Development & Integration
We build the foundation for system interoperability, including third-party API integration, custom API development, and microservices architecture.
- RESTful API Design
- GraphQL Support
- Authentication & Authorization
- API Management & Documentation
Mobile App Development
End-to-end mobile app development for iOS and Android, from planning through store submission. Cross-platform development with React Native and Flutter is also available.
- Native App Development
- React Native/Flutter
- Push Notification Integration
- App Store/Google Play Submission
Development Approach
Agile Development
We release features in short cycles and incorporate feedback along the way. This lets us stay flexible and deliver value continuously.
Build with AI, keep the documents
We build with AI tools such as Claude Code and keep specs and design decisions in the repository, with automated tests and code review, so anyone taking over can read it.
Transparency
Regular progress reports and early issue sharing keep the project status visible at all times.
Development Process
Discovery & Requirements
We learn about your current workflows and challenges to define the scope and requirements for your system.
Design & Prototype
We design the system architecture and create UI prototypes to align on the vision early.
Development & Testing
We build features using agile methods and ensure quality through automated testing.
Launch & Operations
We deploy to production and begin operations, with ongoing support for continuous improvement.
Technologies
Frontend
Backend
Infrastructure
Database
Also Included
Related Services
Pricing guide
Prices are pre-tax guides and vary with scope, integrations, and post-launch operations. Formal quotes are free.
Related work
Projects close to this service. Those with challenge, scope, and stack described come first.
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Development & Production
How long does development take?
It depends on the scope and requirements. Roughly: landing pages take 2-4 weeks, corporate sites 1-2 months, and mid-scale system development 3-6 months. We'll provide details during the initial hearing.
What technologies do you use?
Frontend: React/Next.js/TypeScript. Backend: Node.js/Python/Go. Infrastructure: AWS/GCP/Vercel. We select the best stack for each project.
Can specifications be changed during development?
We use agile development, so mid-project changes are welcome. Major changes may require additional costs or schedule adjustments.
Can you deliver in a way that lets us maintain it ourselves?
Yes. We can deliver with CMS integration, documentation, and manuals tailored to your needs.
Do you handle legacy system renovations or replacements?
Yes. We handle from investigation and analysis to phased replacement planning and migration.
Can you develop smartphone apps?
Yes, we develop for both iOS and Android. We also work with cross-platform frameworks like React Native and Flutter, allowing you to support both platforms cost-effectively.
You can talk to us before requirements are finished.
We can start by sorting what to do first. We run businesses ourselves, so the conversation stays about labor and ops. Consultation and estimates are free.
Online meetings / reply by next business day / free consult & estimate