Explainer

What is a Marketing Engineer (and do you need one)?

In today's post we're taking a closer look at the marketing engineer, the role Greg Isenberg reckons becomes tech's next big hire. The title may or may not stick, but the job is certainly real: I've been running the systems it describes for a year. Here's what it involves, what to build first, and what the sceptics get right.

· Automation · AI agents

AI for the CFO: variable cost, vendor sprawl, and the playbook that ends the surprise bill

Uber reportedly provisioned 5,000 engineers with Claude Code in December 2025. By April 2026 it had burned the entire annual AI budget in four months. Variable cost is the new shape of the AI line item, and the CFOs who are getting it under control are running the same four-lever playbook. Here is what is on each lever, which platforms are credible, and what to ship in the next ninety days.

· strategy · claude-code

AI hallucination, and the boring discipline that stops it being a problem

You have read about lawyers citing made-up cases and chatbots inventing refund policies. The fix is not a new platform or a clever prompt. It is the most boring discipline in software: read what came out and check the bits that matter against a second source. Here is what hallucination is, how we run a Houtini-grade check on every claim, and what would change if your team did the same.

· Claude · strategy

What is RAG, and what could it do in your company?

Your AI confidently answers questions about your business with public-internet knowledge. RAG is the architecture that gets your actual contracts, customer list and operating playbook into the conversation, with citations. Here is what it is, where it sits next to long context and MCP, and what it changes if you sponsor the work this quarter.

· Claude · strategy

The Bitcoin Spiral: How I Built a Live AI-Narrated Dashboard on GitHub Pages

I spent an afternoon building a live Bitcoin dashboard on GitHub Pages with no backend, no paid API key, and a frontier model writing the verdict at the top of the page every six hours. Here's how it works, what it cost (nothing), how to stop the model inventing numbers, and where the architecture goes next when Chrome ships in-browser inference.

What Are AI Agents? The Plain-English Explanation

You can write a good prompt, and you've maybe wired up an MCP or two - but nothing runs unless you kick it off. Today's post gets you to the next stage: what an AI agent is in plain English, where it sits relative to chat and MCPs, and the simplest first agent you can build inside Claude Code this afternoon.