The EPI Journal

Notes on building better software.

Field notes on engineering, design, AI and performance from the team that ships it.

Featured AI

How we ship AI features that survive real users

A field guide to taking assistants from a slick demo to a dependable product feature.

EEPI TeamJun 18, 2026 · 9 min

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Design

May 30, 20267 min read

Design systems that scale (and the ones that do not)

A design system is a product, not a Figma file. What separates the systems teams love from the ones they quietly abandon — governance, tokens, and treating adoption as the real metric.

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Performance

May 12, 20266 min read

The real cost of a slow website

Every 100ms of latency has a price. We break down the revenue math behind Core Web Vitals — and the handful of changes that move the needle most.

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Engineering

Apr 21, 20268 min read

How we choose a tech stack in 2026

There is no best stack — only the right trade-offs for your team, timeline and scale. The decision framework we use on every new project.

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