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Sahar Massachi

Every day is an adventure.

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Junior data engineers build pipelines. Seniors build trust

I just published a piece for DataExpert that I’m particularly proud of. Click here to read it. Like many of my pieces, it makes a few interlapping arguments: Plus a few different war stories from my time in the trenches. I was spurred to write this piece years ago, when I was brought on to […]

How an AI secretary would actually work

A little while ago, I wrote a piece for DataExpert called “A well-architected secretary is 76 agents in a trenchcoat”. It went out to 175k people! I’m proud of it! I’ll paste the full text below for posterity. Some ideas in it: And more. Here’s the piece. A well-architected secretary is 76 agents in a […]

What does baby love?

The other day some form or another asked: “what is your baby’s personality?”. Sarah and I looked at each other, a bit bemused. Does Omri have one yet? How can you tell the difference between something real and just “generic baby”? We talked it out, and here’s our list (as of a few months ago). […]

Will AI chatbots be compromised like CNN, or compromised like Facebook?

Hey! Did you know I have at least one other blog? sahar.substack.com. Unclear how they’ll differ, but now it seems to be that it’s the more public/professional one (fewer mixtapes for Sarah, more thinkpieces). So, I wrote a piece over there — Will AI chatbots be compromised like CNN, or compromised like Facebook? It’s about […]

Stop Using Slowly-Changing Dimensions!

SCD-2 Considered Harmful A little while ago, I wrote part 2 of a series for Zach Wilson’s DataExpert.io.. It did quite well. He kindly gave me permission to republish here. Let’s talk about the pain of unlearning and then let’s get to the magic. Imagine you’re an analyst at a social media company. The retention team […]

The Data Warehouse Setup No One Taught You

Storage is cheap. Your time is not. A little while ago, I wrote a piece for Zach Wilson’s DataExpert.io. It went surprisingly well. He kindly gave me permission to republish here. Running and using a data warehouse can suck. There are pitfalls. It doesn’t have to be so hard. In fact, it can be so […]

Thoughts on Iran

Originally posted to fb; people seemed to like it. Saved here for posterity. I am persian jewish. My family had lived in Iran for centuries, as far back as anyone remembered. Then both sets of my grandparents, independently, fled. One family fled in anticipation of the revolution. The other fled during it. In the last […]

Housekeeping: updated Now Page

Every once in a while I update my “Now. page”. I try to keep track of how it changes over time — when I do make big changes. (Small tweaks? Not worth a post.) Here, I’ll show what it’s been updated to, and updated from. The new, October 2025 version of the Now page looks […]

I like being a dad.

Scattered reflections on fatherhood: I like being a dad. I think I’m good at it. And I think Omri is really great. I notice different things. My friends are mostly childless and it’s strange to move in the world differently than them. I notice whether bathrooms have changing tables now. I look for kids and […]

Podcast and Panel Catchup

Over the last few years, I appeared on many podcasts. And some panels or speeches I gave were recorded. So many that I lost track — I was busy running a think tank! Perhaps just for my own use, here’s a partial list of places I’ve been. Podcasts, and also recorded panels and so on. […]