Notes from the routing layer.

How this is built and why, written by the people who get paged when it breaks.

Engineering21 September 20264 minute read

A transaction should never stay pending

Pending is not a state, it is an unanswered question. Here is how we make sure every question gets answered.

Developers21 September 20265 minute read
Idempotency keys, in practice
The header that stops a retry becoming a double debit, and the three mistakes that stop it working.
Company21 September 20263 minute read
Why we publish our incidents
A status page that is always green is not a status page. It is marketing with a traffic light on it.

Airtime, reimagined.
Routing, today.