KARHU Inc.

KARHU Inc.

有限会社カルフ

Understanding business,
solving with technology.

Business design expertise paired with full-stack capabilities — from frontend to infrastructure. We deliver solutions sized to your problem, nothing more.

RUNNING WORDPRESS?

Tired of scrambling after every PHP vulnerability? Your site may be able to go static — while editing stays in WordPress.Learn more →

HAVE TO KEEP RUNNING PHP?

If your site can't go static, or you run a PHP business system, rethinking the server architecture can limit the damage when a vulnerability is found.Learn more →

ABOUT US

We've been building business systems since around 1990 — before the internet became common, from the era of mainframes, midrange systems, and client/server. The work began as part of a management consulting firm, and has continued through the arrival of the Web, cloud, smart devices, and now AI-assisted development: every generational shift in the technology.

Choosing structures that endure over flashy ones; forms others can pick up later over fast builds — these came from that accumulation. What we choose and what we don't. What we take on and what we decline. Those judgments still rest on the same experience.

About the founder →

SERVICES

System Handoverdetails
  • Taking over systems left without a maintainer
  • Discovery, documentation, and account inventory
  • Incident response, scheduled maintenance, enhancements, migration
WordPress to Static HTMLdetails
  • Assessing and migrating WordPress sites to static HTML — editing stays in WordPress
  • Take PHP and the database off the public server, easing vulnerability response
  • Export only the pages you need, with an export plugin customized per site
Secure PHP Hostingdetails
  • Hardened server architecture for WordPress and PHP systems you need to keep
  • Layered defense with Cloudflare + VPS, or AWS
  • Private admin and maintenance access, encrypted backups, monitoring
Business Systems
  • Business analysis & requirements definition
  • Core systems (sales, inventory, customer management)
  • Automation tools (Excel, data integration, reporting)
Web Development
  • React / Next.js
  • Vue.js / Nuxt
  • Laravel / PHP
CMS
  • WordPress plugin development
  • WordPress API (Headless CMS)
  • MT / PowerCMS
  • Concrete CMS
E-commerce
  • Shopify API
  • Various shopping site APIs
Cross-border E-commercedetails
  • Cross-border storefronts and operations
  • Multilingual, payments, and logistics integration
  • International branding and marketing
Infrastructure
  • Server setup (VPS / AWS)
  • RTSP / RTMP camera systems (HLS / WebRTC)
Digital Signage
  • Display & playback systems (frontend)
  • Content management & distribution (backend)
Education & LMSdetails
  • Moodle theme development
  • Moodle plugin development
Business Simulation Game
  • Browser-based turn-based business management simulation
  • Designed for training: reading P/L, B/S, and CF statements
  • Industry-specific scenarios with AI competitors (current: room AC industry)
Mobile
  • iOS / Android app development

CONTACT

Consultations and quotes are free of charge. Feel free to reach out.