Brex 3.0: An 18-Month Operational Evolution & the Brex Hacker House “AI Startup within a Startup" experiment w/ James Reggio #236

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Nov 12, 2025

James Reggio, the CTO of Brex and a former engineer at Microsoft, Airbnb, and Stripe, dives into Brex 3.0—a bold operational evolution. He shares how a layoff sparked a rebirth, reshaping the company’s focus from a Series E to C mindset. Discover the innovative 'Hacker House' initiative, a startup within a startup aimed at AI disruption. Reggio discusses the introduction of seasonal initiatives for alignment and how shared roadmaps have boosted morale. His insights on balancing innovation within core operations are both enlightening and actionable.

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ADVICE

Reintroduce Metrics Sparingly

Reintroduce only minimal metrics or KPIs after zero-basing to avoid overdesign and poor adoption.
Start with the smallest useful structure and iterate, because adoption matters more than elegance.

ANECDOTE

The Brex Hacker House Experiment

James ran a month-long "Hacker House" where engineers lived together to build a startup-within-Brex to disrupt the company from inside.
The team was time-boxed and protected to maximize greenfield innovation and speed.

ADVICE

Design Constraints For Greenfield AI Teams

Ask "How would we build this if we started today?" to design constraints for a greenfield AI team.
Use small teams, agentic coding, simple tech stacks, and only public core APIs to stay interoperable and fast.

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James Reggio (CTO @ Brex) shares the story of "Brex 3.0", an 18-month journey behind their operational evolution. We explore how they rewound their org from a Series E to a Series C mindset, and replaced siloed OKRs with seasonal "marquee initiatives." James deconstructs the “Brex Hacker House”, an AI-focused startup within a startup experiment aimed to disrupt their core business. This conversation is all about evolving operational rhythms, layers of management, product building, and culture change!

ABOUT JAMES REGGIO

James Reggio is Brex’s Chief Technology Officer. James is a forward thinking technology leader who currently oversees Brex’s entire Engineering org. James joined Brex in 2020 as Principal Engineer and has played a vital role in building the company’s mobile app and AI capabilities. Prior to Brex, James had an extensive career as a Software Engineer at leading companies such as Microsoft, Salesforce, AirBnB, Stripe and more. Additionally, James founded two companies: Altair Management and Banter, a social discovery platform for podcasts that was later acquired by Convoy in 2018. James received his B.A. of Science from The University of Texas Austin.

SHOW NOTES:

The birth of Brex 3.0: Using a layoff as a "moment to refound the company" (3:38)
Moving from a Series E to a Series C operational mindset (5:28)
The problem with a GM model: How siloed OKRs and roadmaps created "deadlock" (6:07)
New rituals: Why the CEO became "chief editor of the roadmap" (8:16)
The impact on morale: "Folks just knew how their work fit into the bigger picture" (11:16)
The challenge of the new model: Who do you hold accountable when you "win and lose as a team"? (13:43)
The lesson for reintroducing systems: "Less is more" (15:43)
The "Startup within a Startup": Launching an internal team to disrupt Brex (16:49)
“What if we were founding Brex again today?” The 4 constraints for the "Hacker House" experiment (17:58)
Questions eng leaders should ask when running a similar experiment to Brex (21:02)
Aha moment: "With agentic coating, code is so cheap" (22:35)
Managing the two narratives: "compounding" the core biz vs. “innovating" with AI (26:01)
A surprising dynamic: Why the AI team struggled to see their impact (while the core team didn't) (29:38)
Building alongside your customer to iterate / experiment faster (36:06)
The turnaround is over: Brex hits 50% YoY growth and cash-flow positive (38:45)
Rapid fire questions (42:10)

This episode wouldn’t have been possible without the help of our incredible production team:

Patrick Gallagher - Producer & Co-Host

Jerry Li - Co-Host

Noah Olberding - Associate Producer, Audio & Video Editor https://www.linkedin.com/in/noah-olberding/

Dan Overheim - Audio Engineer, Dan’s also an avid 3D printer - https://www.bnd3d.com/

Ellie Coggins Angus - Copywriter, Check out her other work at https://elliecoggins.com/about/

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