Work
Systems I built and run
Each one is in production or published, with the numbers it produced.
Multilingual Booking Platform
Booking and payments for a Tokyo photo studio whose customers book from 20+ countries.
After checkout
every booking, automatically
$19.9k
best month in revenue
754
transactions in 8.5 months
39%
of date selections reached a time slot
- Next.js
- TypeScript
- Go
- PostgreSQL
- AWS
- Stripe
- Cloudflare
Staff Operations App (iOS)
An iOS app where contract photographers claim shoots, bill the customer's remaining balance, and send their month-end invoice. Every rule about money, hours and customer data is enforced by the same Go API the booking site uses.
Step 01
Claim a job
Open jobs appear in the app. One tap claims it.
Step 02
Track earnings
Pay is calculated per job, automatically.
Step 03
Invoice at month end
Invoices generate and submit themselves.
#418
Sat · 10:00
Location A
#419
Sat · 14:30
Location B
#421
Sun · 09:00
Location C
Sample data
8
contract photographers on one app
Weekly
production use by the team
- React Native
- Expo (Router, EAS Update)
- TypeScript
- Go
- PostgreSQL
- Stripe
- Google Calendar API
- AWS
TONI — 3D Scroll Site
A concept site for a matcha tonic brand: one real-time 3D can travels the whole page, and AI-generated video handles the liquid scenes.
54.3s → 1.0s
until the can appears on a phone
147.8 → 1.9 MB
initial download after optimizing
6
flavors from one 3D can
- Next.js
- TypeScript
- Three.js
- React Three Fiber
- GSAP
- Lenis
- Higgsfield
- Vercel
AI Agent for Product Management
A Claude Code Skill that takes a PM from a business problem to a PRD and UI mockups in one session, pulling evidence from four tools over MCP.
Published
on the Mercari Engineering blog
In use
internally at Mercari
- Claude Code
- MCP (Model Context Protocol)
- Anthropic API
SIGNAL — A Daily AI Brief
A news product that reads 45 feeds plus Techmeme, Hacker News, GitHub and vendor pages six times a day, groups the same event across outlets, and ranks the day by what actually changes — not by how loudly it was covered.
6×/day
collection runs, unattended, on a cron
45 → 12
RSS feeds read, stories in the daily issue
1.5s
mobile first paint in a throttled lab test, down from 2.2s
- Next.js
- TypeScript
- Supabase
- PostgreSQL
- Anthropic API
- Vercel
Lifters Club — A Training App
A web app for gym training: a plan from your answers, sets logged on the phone even without signal, the next session's weight and reps worked out by rule, and a coach who can read but not rewrite.
Every set
logged on the phone, even offline
582
exercises, each with a licensed motion clip
1,086
unit and component tests; 99.5% of lines in server and library code
21
migrations, row-level security on every table
- Next.js
- TypeScript
- Cloudflare Workers (OpenNext)
- Supabase (Auth, Postgres, Storage)
- Zod
- Vitest
- Playwright
Measured, not guessed
Every step of the booking funnel is instrumented — which is how it showed up that only 39% of visitors who picked a date went on to pick a time, and got fixed.
Booking funnel
7 steps1.03%visit → booked
- Users
- 87
- Of visitors
- 1.6%
- From prev.
- 12.4%
- 1Visited site5,332
- 2Viewed plans82.9%4,418
- 3Viewed locations29.5%1,305
- 4Opened booking90.1%1,176
- 5Picked a date59.4%699
- 6Reached payment12.4%87
- 7Booked63.2%55
GA4 · book.tettyphotostudio.com · Aug 1 – Aug 31, 2026
Seven steps tracked in GA4, from the first visit to a completed booking — the biggest leaks stand out on their own.
Try the flowBookings, Stripe deposits, calendar sync, and photographer assignment arrive as one ordered stream.
See the stackMicrosoft Clarity replays showed where people stalled. The fix went to the time-slot step, not a redesign.
Ask about itGA4 funnel events
Instrumentation on every step of the booking funnel, from plan to deposit.
Session replay
Microsoft Clarity recordings show where customers stall, step by step.
Stripe payment events
30% deposit at booking, remaining balance collected automatically after the shoot.
Calendar sync
Photographer assignment kept in sync with Google Calendar.
Search Console
Branded searches bring nearly every click. Non-branded terms like “tokyo photo studio” sit around position 14 — the next thing to grow.
book.tettyphotostudio.com · web · last 3 months
- Clicks
- 138
- Impressions
- 910
- CTR
- 15.2%
| Top queries | Clicks | Position |
|---|---|---|
| tetty photo studio | 41 | 4.2 |
| tettyphotostudio | 24 | 1.2 |
| tokyo photo studio42 impressions · next to grow | 1 | 14.2 |
AUDIENCE
Personal Brand — 0 to 30,000 Followers
Founder, creator, analyst.
I built a personal brand in the motivation, fitness, and self-growth space from zero. Multiple videos passed 1M views. By the summer of 2026 an ordinary reel was reaching fewer people than it had a year earlier, when the account was about a tenth of the size. The Instagram app shows insights per post but keeps no history, and the official API returns only the current cumulative value of each metric. There was no way to ask how a reel had grown, or to compare this month with last year on equal terms.
A private analytics dashboard for one account. It signs in through Meta's official Instagram login, reads media and insights from the Graph API on an hourly cron, and stores every reading as a timestamped snapshot in Postgres. It uses the official API only: no scraping, no password login. On top of the snapshots: a reel list and detail page with growth over time, manual tags with a top-against-bottom comparison, weekly and monthly trends, and a read-only JSON report of aggregates so the question "how is it going" does not need hand-written SQL.
How it works
Audience analytics
- @imshogo.k
- Motivation
- Fitness
- Self-growth
- 0 → 30,000 followers
- Multiple videos past 1M views
- 13 months of account data
- Shares → reach
- 2.03M views · last 30 days
Views
2.03M
FollowersNew followers
+1,264
Interactions
234K
Daily average
CalculatedPer day
- Views≈ 67,604
- New followers≈ 42
- Interactions≈ 7,799
≈ 115 interactions per 1,000 views.
Instagram Insights · @imshogo.k · last 30 days · Sep 2026
Have something that needs to be built?
Tell me the workflow and what a good outcome looks like. I'll reply with a clear next step.
- 1,200+ clients handled
- Published at Mercari
- 30K followers