The EPI Journal

Notes on building better software.

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

Featured Engineering

Vibe coding: what it is genuinely good for, and where it breaks

Describing what you want and letting the model write it is extraordinarily fast — right up until it meets production.

EEPI TeamAug 21, 2026 · 8 min

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Aug 15, 20269 min read

Loop engineering: the skill that replaced prompt engineering

Prompt engineering was a 2023 skill. What matters now is the loop — context in, action out, verification, feedback. Here is how we design agent loops that finish the job instead of drifting.

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Frontend

Aug 11, 20268 min read

AI in frontend development: what actually changed in 2026

AI can now turn a design into working components, write your tests and handle a migration overnight. It still cannot judge whether an interaction feels right. Here is where the line falls, and how our frontend workflow changed around it.

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Aug 6, 20267 min read

MCP explained: giving AI assistants safe access to your systems

The Model Context Protocol turned AI integrations from an N-by-M problem into a plug. Here is what MCP is, why it matters for businesses, and the security model that has to come with it.

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Aug 1, 20267 min read

Cutting AI running costs without cutting quality

Caching, model routing, tighter retrieval and batching routinely cut AI running costs by most of the bill with no loss in quality. Here is where the money actually goes and which levers are worth pulling first.

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AI search is the new front page — what SEO looks like in 2026

SEO

Jul 22, 20268 min read

AI search is the new front page — what SEO looks like in 2026

AI Overviews and assistants now answer the question before anyone clicks. Here is how we build sites that get retrieved, cited and clicked — structured data, server rendering, entity clarity and the speed budget behind it all.

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Jun 18, 20269 min read

How we ship AI features that survive real users

Most AI demos never survive contact with real users. Here is the exact process we use to take assistants from prototype to production — evals, guardrails, and human-in-the-loop.

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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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