Meet the Team
Small team.
Senior work.
Build Lean is deliberately lean. You work directly with the people who architect the software and the people who take it to market. No account managers in between.
Marco Esquivel
Founder & Solutions Architect
Enterprise engineering foundation, AI-native operating on top of it.
Five years at American Express as a backend engineer in Digital Acquisitions, shipping revenue systems that plugged Amex offers into Delta, Hilton, Marriott, and Credit Karma. In financial services the bar is not optional: availability, scale, and security are day-one expectations, not features added later.
Also the founder of R-Voice, and an AI-native operator for the past year-plus. Custom CRMs, agentic prospecting, automated content and ad tooling, all built by hand when the off-the-shelf version did not fit the workflow.
The throughline is ownership. Most companies rent their operations back one seat at a time. Custom tooling is now cheap enough to own outright, and owning it is where the leverage sits.
Erica Guinette
Head of Growth
Growth across commercial construction and tech, which is exactly the seam Build Lean works in.
Tech sales at Rippling and Headway, selling software to teams evaluating a dozen tools at once. That is a fast education in what makes a buyer commit, what makes them stall, and which promises survive contact with a real workflow.
Before that, marketing inside two general contractors, Elevate and Moss & Associates. That is where the field fluency comes from: how work gets won, how it gets delivered, and where the busywork piles up between the job site and the back office.
The combination is the point. Enough construction fluency to speak the language of the job site, enough tech fluency to know what modern software can actually do for it.
Want to build something together?
Tell us what you're trying to solve. We'll tell you straight whether custom is the right call, and if it is, what it would take.