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Tech Titans: Why Your Home Alarm Does Nothing to Stop a Crime with Dave “Selly” Selinger artwork

Tech Titans: Why Your Home Alarm Does Nothing to Stop a Crime with Dave “Selly” Selinger

Modern CTO

September 10, 2026

Today, we're talking to David Selinger, founder and CEO of Deep Sentinel and co-founder of Redfin.

Speakers David Selinger, Joel

TopicsTechnologyBusinessManagement

David Selinger (0:00)

You don't realize that 100% of the crime-fighting tools that you have available to you do absolutely nothing to fight crime. They do nothing to solve the only problem that matters to you as the buyer, the business owner or homeowner. A lot of people don't know that about Redfin, that Redfin predated Google Maps, Redfin predated any sort of interactive mapping. And we built the very, very first interactive mapping application in the world.

It takes all of the things that we might distill from the universe, like eat this, don't eat this, this has this effect, this has this effect. And it tells you what that effect is on you, and it does it in real time. So like specifically for me, the two biggest learnings I've had are that my personal response to fiber in oatmeal and peanut butter is out of this freaking world. My blood sugar goes from like this to just a nice even no wiggle for up to four hours, regardless of what I eat afterwards, if I eat peanut butter and oatmeal and chia seeds. So when I say oatmeal, I mean like stone cut with a ton of chia seeds in it. But that fiber impacts my day for four hours in a controlling manner, which is just blew my mind.

I kind of figured, you know, it's kind of like the glycemic response. It'll mute that initial glycemic response. And that's absolutely not what happens. It does do that. But what's way more important is it does that for hours and hours and hours afterwards.

Joel (1:46)

So tell me, does it penetrate your skin? Like what, is a needle going into your skin?

David Selinger (1:51)

Wow, you used the word penetrate in the first 10 minutes of a podcast interview. All right, cool.

So my buddy who sold me on this is a former Colonel in the Pentagon. And we were sitting talking and he thought it did not. And then it like measures your sweat. It totally does. It totally does. But not in a way that I think is in any way uncomfortable.

Joel (2:14)

It penetrates you in a classy way.

David Selinger (2:16)

Yeah, it's a suit.

Joel (2:19)

There's a new tagline for the glucose company. I lose.

David Selinger (2:24)

Yeah. I mean, if you look at the threshold in even like scientific research, right, it's to be statistically significant, which doesn't mean it applies to you. It just fundamentally doesn't. And I feel like I've read everything you can read about nutrition. And just that practical on the ground where the rubber meets the road has allowed me to throw away like 25 to 30% of what I read because I know it doesn't apply to me. And focus on the bits that do apply to me. Deep Sentinel is the most interesting company you're going to learn about on this podcast ever. Period. Full stop. And I'm not saying that just because I happen to be the CEO and founder, but it really is an amazing company, right? And it's something that touches all of us. It's in the physical security space, as the name might suggest.

And it stops crimes. And what is ridiculous to me, and the reason I think it's so interesting, is because I built Deep Sentinel because the entire United States has been lulled into a state of idiocy by the solutions that are available right now. And idiocy is a term that I think is absolutely correct. I apologize to anybody who got their feelings hurt in the last 10 seconds, but like, here's my story, is my neighbor had a home invasion. I'm an engineer. So I of course run the neighborhood watch and made sure everybody has cameras and alarms and everything like that.

She has a home invasion. So we have the police come.

And the police are there and we say, hey, we have an alarm. We have all this video footage. Why don't, why haven't you solved the crime? Why did this happen? How did this happen? And the police officer looks over at me and he's like, you're the tech dude. What did you expect the alarm to do? It wasn't armed. She was home. What did you expect the cameras to do? Like jump out and stop this crime? You don't realize that 100 percent of the crime fighting tools that you have available to you do absolutely nothing to fight crime. They do nothing to solve the only problem that matters to you as the buyer, the business owner or homeowner. You cannot get pepper spray at your home right now.

But yeah, I mean, I think the best way to describe this would be a specific example. Almost exactly a year ago, the second week of September in 2023, I had a man come to my house armed with a crossbow of all weapons, with the intent of breaking in and stealing stuff.

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