この場所の仕組みは、ひとりでつくりました

つくった人と、 仕事のご相談

予約と決済、AIチャット、玄関のキオスク、カメラとセンサー。標高1,444mのこの場所を動かす仕組みは、仙人けんじ(Kenji Sakuramoto)がつくって、毎日動かしています。同じものを、あなたの施設にもつくります。

仕事の相談をする

How he got here

Sennin Kenji (Kenji Sakuramoto), founder of kensaurus. IT consulting, cyber security and app development through his 20s and 30s. He renovated a closed farm rest stop at 1,444 m and opened this place on 8 August 2026. Grass cutting, septic tanks, a mountain winter: all new. He also takes on consulting, development and photography.

More about Sennin Kenji

一本の線で、ぜんぶつながっている

お客さまがサイトを開いてから、玄関のドアを開けるまで。その線の上に、こんな仕組みが並んでいます。

  1. The booking site

    The site you are reading. Guests check what is free in Japanese or English, then book and pay on the spot by card, Square or PayPay.

    道具 React 19 · TypeScript · Vite · Supabase · Stripe · Square · PayPay

  2. One AI, four doors

    The site chat, LINE, the tablet by the door and the door voice: the same AI answers from the same data as the price list, and hands what it cannot answer to Sennin Kenji.

    道具 Claude · LINE Messaging API · Supabase Edge Functions · Langfuse

  3. The kiosk at the door

    An Android tablet at the door does the front desk’s job. The app updates itself over the air.

    道具 PWA · Android · OTA

  4. The site monitor

    Seven cameras, temperature and water-level sensors, power plugs and the network on one plan of the site. AI tells people from cars, and the recordings can be replayed.

    道具 Frigate · OpenVINO · SwitchBot · Ecowitt · Omada

    Read how the site monitor was built (kensaur.us)
    The site monitor: a plan of the site with the seven camera feeds and each room’s temperature on it
    牧場モニターの実際の画面
  5. The console

    Bookings, the shop, Wi-Fi codes and the ad numbers on one screen. Staff alerts arrive on Discord.

    道具 Supabase · Discord · GA4 · Google Ads · Meta

  6. Signs and print

    Posters, flyers, name cards and the signs on site come from the same price data as the site, so print never disagrees with it.

    道具 React · Playwright · PDF

  7. Security, and the day something breaks

    Every change goes live only after tests and automated checks pass. The database is locked down row by row, and there are written steps and spares to bring the on-site PC back if it dies.

    道具 GitHub Actions · Playwright · semgrep · gitleaks · Sentry

    The site monitor’s topology: the internet, the gateway, the recorder, cameras, sensors and Wi-Fi on one diagram
    牧場モニターの実際の画面

数字で見ると

3,030
changes shipped since December 2025
85
server functions
964
database migrations
7
cameras on one screen

2026.10.30時点。コードから数えた値です。

お金は、いちど入力するだけ

I used to type the same money into three apps.

  1. Tsumagoi Work&Camp

    Sales, payouts, stock and the daily close. It writes accounting batches at each close and every night.

  2. 一人社長 Solo Boss

    Pulls those batches every hour and books them as draft journal entries. Nothing reaches the ledger until they are approved.

  3. yen-yen

    Sends business costs paid on a personal card to Solo Boss as 立替 claims, and gets their status back.

We can build this kind of link between your apps.

ほかにつくったもの

あなたの施設に、おつくりできるもの

最初の30分のオンライン相談は無料です。料金は、内容をうかがってから決めます。

  1. Booking and payment sites

    Live availability, online payment (card, Square, PayPay), Japanese and English, and the confirmation mail.

  2. AI chat and auto-replies

    On your site, LINE or a tablet at the counter: answers from your own price list and rules, and hands the rest to a person.

  3. Cameras and sensors on one screen

    The same system as our site monitor, for your place. The terms of a pilot are being set now; ask us.

  4. For campground and event operators

    Booking-site emails into one booking table, the water-tank level, arrivals at the gate camera, and a daily sales report: the system that runs this place every day, for places run by very few people.

  5. Advice for small places

    For small inns, coworking spaces and campsites: the booking flow, ad measurement, listings and automating the daily work.

We also upgrade old PHP systems without switching them off(新しいタブで開きます)KENSAURUSのサイトへ(新しいタブで開きます)

一緒にやりませんか

この仕組みをほかの場所へ広げる相手も、出資や提携の話も、歓迎します。

取材・記事

この場所と、その仕組みについて書いたもの。

noteとZennで、ほかの記事も: note · Zenn

よくある質問

Who built the Tsumagoi Work&Camp system?
Sennin Kenji (Kenji Sakuramoto, representative of Kensaurus LLC), who runs the place, designed, built and runs it alone: booking and payments, the AI chat, the kiosk at the door, the camera and sensor monitor, and the signs and print.
Why did a software engineer start this place on a mountain?
After his 20s and 30s in IT, Sennin Kenji wanted something completely different in his mid-30s: renovating a building, a mountain winter, hospitality and events. It was paid for by kensaurus's IT work and by money he lent the company from his own savings and salary. With no mains water or sewer, he is learning the septic tank, grass cutting and the rubbish one at a time. The place is also where kensaurus tries its consulting, development and photography work first.
Can kensaurus build a booking site or a camera dashboard for my place?
Yes. We build booking and payment sites, AI chat, and screens that put cameras and sensors on one plan for small inns, coworking spaces, campsites and similar places. The terms of a site-monitor pilot are being set now. Start by telling us about your place.
How do I get in touch about a project?
By email (kensaurus@gmail.com) or the form on this page; there is no phone. Tell us about the place, what you want to change and by when. The first 30-minute call (online) is free; a site visit is by arrangement, with travel costs charged.
Can you connect my booking, accounting and expense apps so money is entered once?
Yes. Tsumagoi Work&Camp writes accounting batches at each close and every night; Solo Boss pulls them every hour and books them as draft journal entries. Business costs paid personally go from the yen-yen money app as claims, and their status comes back. We build the same kind of link between your apps.
Are you open to partners or investors?
Yes. If you want to take this system to other places, help build places like this one, or are thinking about investing or partnering, we would like to hear from you.

仕事のご相談

メールで、施設のことと、変えたいことを教えてください。このページをどこで知ったかも、ひとこと添えてもらえると助かります。

メールで相談するkensaurus@gmail.com

最初の30分のオンライン相談は無料です。現地へうかがう場合は日程を相談して決め、交通費をいただきます。電話はありません。

フォームで相談する

この場所のこと:ホームInstagram(新しいタブで開きます)ご滞在・ラウンジのご質問はLINE(新しいタブで開きます)

Sennin Kenji waving hello

Even up a mountain, you wire it one cable at a time. — Sennin Kenji