_{今日山色 · 2026-09-21 · a new ink landscape every morning, seeded by the date  ·  「独自凄凉还自遣，自制离愁。」 龚自珍}

Hi, I'm jk.

Software engineer. I work on billing and growth infrastructure — the plumbing that turns usage into revenue — and on making engineering teams faster with AI agents.

Languages	Go · Python · TypeScript · Rust
Ground	Kubernetes · Postgres · Stripe · Cloudflare
Thinking about	agentic engineering, the economics of AI products
Explore	听风的小世界 — wander a little archipelago of writing, projects and games

_{About the painting}

_{Drawn from scratch every morning by a GitHub Action, with the date as the random seed — value-noise ridgelines, layered washes, one red sun. Same day, same picture; tomorrow, a new one. It is the same painter that draws the header of 听风闲语.}