Founder and Editor

Marcus Ellery

Marcus spent a decade building payment and machine learning infrastructure before starting GeeklyPlug in 2026. He writes the AI and technology coverage and tests every workflow he describes before it goes out.

Marcus Ellery

Founder and Editor, GeeklyPlug

Background: 12 years building payments and machine learning infrastructure
Covers: AI, Technology
Expertise: Large language models, Claude, Prompt engineering, AI inference cost, Machine learning infrastructure
Elsewhere: LinkedIn

Read how we work on the About page, or send a correction through Contact.

Articles by Marcus

AI8 min

Claude prompt engineering: 10 techniques and templates that work

Claude follows instructions precisely, which is great when your prompt is clear and frustrating when it is not. These are the techniques that make the biggest difference, with prompts you can copy.

Marcus Ellery

Sep 27, 2026

AI10 min

What are Claude Skills? How they work and how to build one

Skills turn the instructions you keep pasting into Claude into a reusable folder it loads on its own. Here is how they work, where they run, and how to write one that Claude actually picks up.

Marcus Ellery

Sep 27, 2026

AI8 min

Small language models vs LLMs: how routing cuts inference costs

The frontier gets the headlines, but the models doing most production work keep getting smaller. Here is the cost math, a routing pattern you can ship this week, and when a small model is the wrong call.

Marcus Ellery

Aug 28, 2026