Zachariah Rosenberg

Founder & CEO

Maxwell Wu

Chief Underwriter

Kate Millner

Head of Operations

Kenneth Mendonca

Lead Engineer

In addition to daily CEO duties, Zac is a full-stack engineer, multifamily underwriter, and resident data scientist at TapCap.


Before TapCap, Zac was the director of Greystone Labs, the primary R&D team driving Greystone’s lending innovation. Zac was the original full-stack web developer, which combined with his background in commercial underwriting, allowed him to single-handedly build applications that processed and netted the firm hundreds of millions in additional loans. He eventually built a team of 14 employees that processed over $3Bn in loans. 


Zac has sat on the Fannie Mae tech committee, the Mortgage Bankers Association tech roundtable and advised several real estate startups. He dropped out of Australian National University to pursue his first startup. 


Maxwell leads sourcing, structuring, credit analysis, underwriting and business development.


Formerly, Maxwell was a private equity real estate investment and operations professional. He has experience managing institutional private equity funds of over $1.4B in equity, underwriting single asset and portfolio acquisitions as well as structuring complex joint ventures and limited partnerships. Strategies included commercial real estate equity, distressed CRE mortgage loans, CMBS, CDOs, whole loans, B-notes and mezzanine debt.


Prior to joining TapCap, he was a principal at PNE Holdings, a private investment firm focused on unique real estate companies and technology investments. He’s also held positions as a fund manager, investment banker and principal investor at several real estate firms. He began his career at C-III Capital Partners.


Maxwell attended the University of California, Santa Barbara and received a Masters in Real Estate from Columbia University.


Kate manages business operations, marketing, recruiting, and client support. 


Before joining TapCap, she was a Project Manager at Greystone Labs where she managed recruiting, marketing, and served as the liaison between the innovation team and Greystone’s business leaders. While there, she led the effort to adapt one of the Labs’ technologies to Greystone’s SBL loan business. 


Prior to Greystone, she worked at Vanguard as a Brokerage Investment Professional where she received her Series 7 and 63 certifications.


Kate graduated with a Bachelor of Arts from the University of Virginia.



Ken architects and develops all of our software, integrating our underwriting models, turning our designs into user-friendly interfaces and ensuring all TapCap technology is operating smoothly.


Prior to joining TapCap, Ken was the sole backend engineer at Greystone Labs where he built an array of cloud based tools used to manage the loan process. He also managed company-wide Salesforce integrations. 


Before that, he worked at the digital agency Beyond where he maintained Google's Marketing Platform, formerly DoubleClick, a content management system. 


Ken received his bachelors in Neuroscience & Behavior from the University of California, Santa Cruz.


Meet The Team

The lender for the digital age.

We're a fully digital commercial real estate lender. As underwriters, software engineers and data scientists, we believe getting a commercial mortgage should be simple, efficient, and most of all, transparent.


The team, tech and know-how are the result of 5 years of incubation as Greystone Labs, the R&D team fueling Greystone's multi-billion dollar loan origination platform, where we designed, developed and deployed apps that processed over $3Bn in loan originations.