Field Notes

The Discipline of Deleting Code

Fri, 08 May 2026 09:00:00 -0700

The code you delete never breaks, never gets a CVE, and never confuses the next reader. Subtraction is the most underrated engineering skill we have.

Reading the Sky: Observability as Wayfinding

Sun, 15 Mar 2026 09:00:00 -0700

You don’t navigate by staring at the ground. Observability is how a system tells you where you are before you’re already lost.

Notes on Zero-Cost-When-Idle

Tue, 20 Jan 2026 09:00:00 -0800

Architecture that costs nothing at rest isn’t just frugal — it’s a forcing function that quietly makes the whole system simpler and more honest.

The Shape of a Good Interface

Mon, 03 Nov 2025 09:00:00 -0800

A good interface is small on the outside and honest about what it can’t do. Most of the cost of software is paid at its seams.

Navigating by Invariants

Fri, 12 Sep 2025 09:00:00 -0700

An invariant is a promise the system keeps no matter what. Pick a few good ones and most of your design decisions stop being decisions.

About these notes

Mon, 01 Jan 0001 00:00:00 +0000

Every team accumulates knowledge the hard way: a postmortem here, a migration there, a design review where someone finally said the thing out loud. Most of it evaporates. Field Notes is our refusal to let it.

These are working notes from Prosyon — short, honest write-ups of what we learned building and operating real systems. Not tutorials, not thought leadership. Just observations, recorded close to where they happened, while they were still sharp.