Writing

The blog

Things I build, break and learn, explained the way I explain them to my students: simply, with diagrams, and with the occasional bad joke.

Close-up of a circuit board with microchips lit in blue and orange light

2 Oct 2026 · 5 min

Claude on Amazon Bedrock without the headache

How to call Claude from inside your AWS account: what Bedrock adds, a 15-line example, and the gotchas I hit.

  • AI
  • AWS
  • Claude
Laptop, coffee mug and desk lamp on a wooden desk at night with city lights in the window

12 Jul 2026 · 5 min

Gym, learning and a life after a 10-to-7 job

How I fit fitness, side learning and teaching around a full-time job without turning into a zombie. Mostly.

  • Life
  • Productivity
  • Fitness
Curved wooden library shelves packed with books, with a gallery level above

9 Nov 2025 · 6 min

RAG: giving your AI an open-book exam

Your LLM is a brilliant new hire who has never read your company wiki. RAG hands them the right page, every time.

  • AI
  • RAG
  • Business
Aerial view of a busy multi-level highway interchange full of cars

21 Sep 2025 · 7 min

How Go runs a million goroutines on eight cores

The M:N scheduler in plain words: G, M and P, run queues, work stealing, and what happens when a goroutine blocks.

  • Go
  • Concurrency
  • Runtime
Cooks in white uniforms working at a steel counter in a busy restaurant kitchen

10 Nov 2024 · 6 min

The JavaScript event loop is one very busy waiter

Single-threaded, yet somehow serving every table. Call stack, microtasks, tasks, and why your setTimeout(0) is late.

  • JavaScript
  • Node.js
  • Fundamentals
Long aisle between rows of metal server racks in a bright data center

26 Nov 2023 · 6 min

AWS serverless, explained like you're my cousin

There are still servers. You just stop babysitting them. Lambda, API Gateway, queues and the dreaded cold start.

  • AWS
  • Serverless
  • Architecture