Why AI Commerce Isn't Going Anywhere

Human Not Present payments are technically possible, but socially unacceptable

Oct 15 • 

Alvaro Duran

2

How To Prevent Cache Stampedes

Think cache invalidation and naming things are hard?

Oct 8 • 

Alvaro Duran

What Makes DynamoDB a Good Database Choice for Payments

A database engine for the always-on payments era.

Oct 1 • 

Alvaro Duran

2

September 2025

CQRS Is Just Balances And Records

Ledgers are hard because you're forced to separate reads from writes

Sep 24 • 

Alvaro Duran

How To Review Code That Deals With Money

You're probably focusing on the wrong things. It doesn't look as good as you think.

Sep 17 • 

Alvaro Duran

2

How to Build Payment Webhooks Fast

It's not that webhooks are difficult.

Sep 10 • 

Alvaro Duran

1

The ID Gapless-Latency tradeoff

You can get unique identifiers at scale either by Coordinating or by Centralizing ID creation. But you can't get gapless sequences without having to…

Sep 3 • 

Alvaro Duran

1

August 2025

Richard Pryor Stole a lot of Half Cents and Bought a Ferrari

Why Floats and Decimals as Money Make Illegal States Representable

Aug 27 • 

Alvaro Duran

4

1

Paying At The Pump: Why Auth and Preauth Are Not The Same Thing

And how it affects implementing new payment methods that look "similar" from the outside

Aug 20 • 

Alvaro Duran

1

The Playbook's 2025 Beach Reads

I love reading on the beach.

Aug 13 • 

Alvaro Duran

2

Testable Payment Webhooks

PSPs are prioritizing their engineers' experience above anyone else's

Aug 6 • 

Alvaro Duran

July 2025

Pull Requests Are Herbie

Why waiting for the damned PR is the main productivity hit for software teams

Jul 30 • 

Alvaro Duran

2