Seán McNamara
Software engineering & other rabbit holes
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Posts · 32
Longer pieces on things I’ve thought about, worked on, or figured out.
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Post
AI
Two AI Skills Everyone Should Use
The humanizer skill stops your writing sounding like AI slop, and i-have-adhd makes AI replies easier to digest while you iterate.
22 Oct 2026
6 min
Post
AI
AI's Environmental Impact
Training a model has a huge one-off energy cost and a single prompt barely registers, but billions of prompts a day can still outweigh the training. There's a calculator to try your own usage too.
17 Oct 2026
5 min
Post
AI
AI Hero's Grill and Wayfinder Skills
When I reach for grill-me, grill-with-docs and wayfinder, three of Matt Pocock's AI Hero skills.
10 Sep 2026
2 min
Post
Productivity
My Opinionated MacBook Setup
Everything I change on a fresh machine, in four parts: the settings anyone benefits from, the habits to unlearn if you're coming from Windows, the next level up, and the bits that only matter if you write code.
10 Aug 2026
15 min
Post
Programming
Building Chinwag, a WhatsApp Chat Analyser
Parsing WhatsApp exports into a timeline, running lexicon-based sentiment over it, and keeping every byte on your own machine.
7 Apr 2026
5 min
Post
AI
What Are World Models in AI?
My notes on what people mean by "world models" in AI: models that predict what happens next, explained with chess and driving.
1 Apr 2026
3 min
Post
Productivity
Parallel Claude Code with Git Worktrees
How I run several Claude Code sessions at once, each in its own git worktree with its own Docker containers, so nothing ever needs stashing.
23 Jul 2025
5 min
Post
Productivity
My Development Workflow in 2024
How I develop in 2024, from Docker for PHP and Go to why I still host on DigitalOcean rather than AWS.
9 Nov 2024
5 min
Post
AI
How I'm utilising ChatGPT
How I use ChatGPT for programming, from answering questions that used to send me to Stack Overflow to parsing web pages.
13 May 2023
1 min
Post
Systems
Gitlab CI - Commit & Push in a Job
How to make a GitLab CI job commit and push files back to master, using a deploy key and an SSH known hosts variable.
26 Jul 2022
2 min
Post
Personal
Reflections on 2021
What I got into in 2021, mainly Flutter app development and crypto, and why I'm learning Solidity to contribute to Klima DAO.
31 Jan 2022
4 min
Post
Systems
Cheat Sheet: Screen
A cheat sheet of screen's commands, for running long jobs on remote servers and switching between several shells in one terminal.
6 Sep 2021
1 min
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