Fukuoka / Since 2012

Built with care, moved forward with care. The software your business actually needs.

TANOSYS is a Fukuoka-based contract software development company. From early discovery through implementation and operations, a small team that moves fast and ships carefully alongside you.

Contact us See our work

01 / Service

What we do

Most of our revenue comes from contract development. Web and mobile are our main fields, with growing work on AI integration and adoption support.

Core

Web applications

From internal tools to customer-facing services — discovery, design, implementation, and operations in one team.

Core

Mobile apps (iOS / Android)

Consumer-grade apps designed for long-term operation. We can join from the earliest planning stage.

Support

Maintenance & evolution

Pragmatic improvements to inherited codebases, plus continued operational support.

Growing

AI services

AI integration, internal adoption & enablement, and hardening services built with AI tools.

Service details

02 / Works

Domains we've supported

Client names are withheld. What we can share is the long-running, operation-first services we've shipped — not one-off marketing pages, but products closer to everyday infrastructure.

  • Parking
  • Child safety
  • Kid-friendly messaging
  • Cross-border EC
  • Luggage storage
  • Pet video SNS
  • AI PoC
  • Partner engagements
See projects

03 / Fit

Where we fit

Saying honestly when a project isn't a fit is part of how we work.

  1. 0→1 launches

    Shaping a new service from nothing — from discovery through to shipping.

  2. Working alongside unfinished specs

    When the docs aren't ready yet, we move forward through conversation.

  3. Small to mid-sized web and mobile products

    Built at the scale where a small team can decide and adjust fast.

  4. Pragmatic improvements to existing services

    We're at our best improving inherited codebases without breaking what runs.

See where we don't fit, too

Based in Fukuoka, we've continuously supported clients across the country and overseas. Long-running, contract-focused — and quietly proud of it.

Chasing the newest tech isn't the whole of engineering. To keep your business running tomorrow and years from now, we propose the realistic option and ship it carefully. Continuity over flash — that has always been the bias.

About TANOSYS

05 / Labs

Not just contract work.

Featured Project

JsonUI

An agent-driven UI development platform.

Built for a world where AI agents write UI code. A spec-first workflow paired with specialized agents puts the guarantees into the structure itself — not into prompt discipline — so the same spec yields consistent native UI for iOS, Android, and Web.

Explore Labs GitHub (TaiKim)
view.jsonui 
{
  "type": "view",
  "children": [
    { "type": "text",
      "text": "Hello" },
    { "type": "button",
      "label": "Tap" }
  ]
}
iOS Android Web native output

Start with a conversation.

A specific project, a half-formed idea, or just wanting to talk — all are welcome.

Contact us