System Development Company
Systems that fit the hand.
We build systems that follow how people actually work — handling everything from framing the problem to design, implementation, and running it in production. Ship something small, then learn from real use.
Services
Services
Not just building — deciding what to build, and keeping it alive after launch.
Product Development
Design and implementation of web applications and internal systems, from technology choices through to production operations.
AI Enablement
Putting generative AI to work: RAG and agent design, from first prototype to something that holds up in production.
Technical Advisory
Architecture reviews, development process, code review. We stay alongside your team until they can carry it themselves.
Products
Our products
Alongside client work, we build and run our own services and apps.
Web
Queue & Reservation Demo
Restaurant waitlist & time-limited reservations Works with AI assistants (MCP)
A demo where a restaurant waitlist and reservations run on an in-store QR code and the customer’s phone browser — and can also be driven by AI assistants such as Claude and ChatGPT.
Learn more →Web
Automated Delivery Route Planner
Builds a route for each vehicle from your truck count, depots and delivery stops
Enter your vehicles and delivery stops and get a route plan in seconds that respects arrival windows and driver breaks, shown on a map and a timeline.
Learn more →Web
Postal Code Search API
Japanese postal codes and addresses, both ways
Look up Japanese addresses from a postal code, or the other way round. Public REST API included.
Learn more →iOS
Koyomiaruki
Walking with the moon and the seasons
A step counter that never sets a goal. Walk with the 72 microseasons of the Japanese calendar and the phases of the moon.
Learn more →iOS / Android
Negoto Recorder
Snoring and sleep-talk recorder
Records snoring and sleep talking automatically overnight. Recordings and logs never leave your device.
Learn more →iOS / Android
FreeCell Levels
FreeCell solitaire, sorted by difficulty
The classic FreeCell solitaire, sorted into levels from beginner to master.
Learn more →iOS
Arrow Chain Puzzle
Set up the chain. Tap once.
Tap arrows to send them off the board. Blocked ones wait in reserve, and the moment the exit clears they all rush out at once.
Learn more →
Approach
How we work
Decide what to build, together
Come to us before the requirements are settled. We start by working out what the real problem is and where to cut in first.
Build small, verify early
We hand over something working as early as possible and adjust direction from real use — which structurally reduces expensive rework.
Write code that can be handed over
Documentation, tests, and CI/CD ship with the code. The goal is a codebase your team can keep moving after the engagement ends.
Tell us what you are working on.
A rough idea is enough — it does not have to be a spec yet. A second opinion on a technology decision is also welcome.
Go to the contact form