year
2026
role
co-founder · CTO
client
shizuka inc · YC W26
stack
Next 15 · tRPC · Postgres
shizuka (静か, lit. 'quiet') is the operating system for solo founders — invoicing, contracts, taxes, and async client ops in one calm surface.
ch · 01
thesis
the solopreneur stack is loud. 14 saas tabs, 3 spreadsheets, an inbox you fear. shizuka collapses that to a single weekly review and a focus mode that hides everything else.
ch · 02
engineering
edge-rendered Next 15 on Vercel, Postgres on Neon with row-level multitenancy, tRPC for end-to-end types, Stripe Connect for instant payouts. event-sourced ledger for tax-grade auditability.
ch · 03
outcome
300 paid users in the first 6 weeks. accepted into YC W26. ARR crossed $180k within 90 days of public launch.
/ outcomes
paid users
1.2k
ARR
$420k
p95 ttfb
84ms
NPS
71
/ stack
/ links