How We Built a Full-Stack POS and IoT System for Japan's Restaurant Market — From Zero
First project. No existing infrastructure. Now serving 1,700+ restaurants across Japan.
This is where the partnership started. A Japanese client came to us with no existing tech infrastructure and a clear problem: restaurant operations that didn't scale. We built a full-stack order management system (OMS) with IoT integration from zero. It was the first of three projects together — and the one that set the standard for everything that followed.
While often grouped with POS systems, this platform functions primarily as an order management system — focused on real-time order flow, kitchen coordination, and operational visibility rather than just transactions.
By the Numbers
Serving over 1,700 restaurants with multi-million yen annual revenues, the platform continues to generate strong recurring income as adoption expands, reflecting the system's reliability, real-world value, and long-term scalability.
What We Built
We led the product roadmap before a line of code was written — mapping restaurant workflows, identifying gaps, and defining what the system needed to do in real operations. The result is a restaurant order management system that connects order placement, kitchen coordination, and reporting across web and mobile in one system.
The Stack
The platform integrates software and physical IoT hardware in one system:
- Python + Django for a secure, high-performance backend
- PostgreSQL for reliable, scalable data management
- Flutter for building responsive mobile apps across iOS and Android
- Web dashboard with live analytics and intuitive controls for restaurant operators
- Seamless IoT integration with receipt printers and kitchen display systems, enabling real-time order routing without manual input
Restaurant operators get full visibility and control without needing a technical background to use it.
Our Role Beyond the Build
Shipping the system was the beginning. We continue to support the client with:
- Regular system maintenance and performance optimization
- Technical updates to ensure platform resilience and security
- Consulting on feature expansion and UX improvements based on real-world use
- Scalable architecture planning as their client base grows across Japan
This client came back twice more after this. That's the only proof of confidence that matters.
The platform now serves 1,700+ restaurants across Japan — proving the scalability of a well-designed order management system in high-volume environments. This was the first project with a client who came back twice more — with a golf simulation game and a nationwide EV charging platform. The work here is what made those possible.
More from This Client Partnership
Project 2 — IoT-Integrated Golf Simulation Game A 2D/3D golf simulator with real hardware IoT integration for motion tracking, built with Unity, Objective-C, and Kotlin. Read the case study →
Project 3 — Nationwide EV Charging Platform (56,000+ Chargers) A gamified EV locator app now covering 56,000+ chargers and 23,000+ stations across Japan. Read the case study →
Building something complex? Talk to us about your project →