ko-chan (@ko-chan)

Building Saru (猿) - Multi-tenant SaaS Foundation

I'm a solo developer creating an open-source subscription management system designed for B2B SaaS platforms with complex account hierarchies.

What I write about: • PostgreSQL Row-Level Security for tenant isolation • Multi-tenant architecture patterns • Go backend development • Next.js + TypeScript frontend

Tech Stack: Go, Next.js, PostgreSQL RLS, Keycloak, Docker

Currently publishing a series on implementing bulletproof tenant isolation using PostgreSQL RLS - lessons learned from building a real-world multi-tenant system.

@ko-chan

ko-chan

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ko-chan's blogs

Recently published

Evaluating GitHub Agentic Workflows — From a Claude Code User's Perspective [Part 10]

pnpm + Next.js Standalone + Docker: 5 Failures Before Success [Part 9]

Next.js + Go Monorepo: Managing 4 Portals × 4 APIs as a Solo Developer [Part 3]

Landmines and Solutions in Self-Hosted CI/CD: 15 Runners x Shared Docker Environment [Part 7]

Turning Solo Development into Team Development with Claude Code Agent Teams [Part 8]

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