Stephen Haskin

Chief Executive Officer

Stephen leads Buildup’s corporate development, strategic partnerships and customer success initiatives.  He brings a deep customer-centric view of construction tech software based upon his 10 years working in real estate acquisitions, asset management and property management.

While working in Private Equity, he led the acquisition and development of over $500 million in multi-family and mixed-use projects throughout the United States.  Prior to joining Buildup, Stephen worked for San Francisco based Mosser Capital Management, a large private equity firm specializing in multi-family real estate investments and operations.

Stephen graduated from Colgate University with a BA Degree in Geography.

Yael Sherman

Chief Technology Officer and Co-Founder

Yael co-founded Buildup Technologies in 2014.  She observed the complexity and inefficiency of large construction projects and wanted to solve a key part of that problem.  Digitizing task management and punch list processes was the solution.  Yael oversees product management and R&D at the company’s US and overseas offices.

In her 14 years in the software industry, Yael has developed complex software applications for the mobile software industry (Verifone), the Isreali defense sector, and in banking.

Yael holds a BA in Management and Computer Science from the Open University of Israel.

Mark Peter Petroff


Mark joined Buildup Technologies in 2018 after completing six successful start-ups and raising over $125 million in venture funding.  He has served as CEO, COO and CFO of a variety of tech companies in the US and abroad, including multi-year expat assignments in Europe, Australia and the Carribean.  Mark’s first startup scaled to 450 employees in 40 offices spread across 14 countries.  Previously, he served as COO of Valor Water Analytics, which was acquired by Xylem (NYSE: XYL).

Mark has served on over 25 boards in 12 countries.

After attending Cornell University, Mark earned his BA in Economics from Stanford University.

Elissa Flandro

Vice President of Customer Success

Elissa oversees Customer Success for all Buildup’s domestic and international projects. In this capacity, she helps ensure all projects start and continue to run smoothly and that all software users are quickly and efficiently supported.   Elissa started her career as a construction engineer working in the SF Bay Area on the San Francisco International Airport expansion and the Transbay Transit Center project.  Afterwards, Elissa worked for three construction technology companies including most recently, HoloBuilder.

Elissa is the Bay Area chapter leader for the Society for Construction Solutions.  She holds a Bachelor’s and Master’s Degree in Civil & Environmental Engineering from Stanford University.

Evan DeMarco

Vice President, Eastern US Region

Evan manages Buildup’s new business acquisition on the East Coast.  He has extensive experience working with real estate developers, general contractors and subcontractors from the pre-construction phase through project completion. Prior to joining Buildup, Evan held sales and business development roles in multiple industries including: construction technology, real estate, online advertising, and logistics.

Evan earned his Bachelor’s Degree in Business from Northeastern University with an emphasis on Management and Marketing.

Board Members

Guy Goldstein, Chairman

CEO, Next Insurance

Eitan Bek

Managing Partner, TLV Partners

Ahikam Kaufman


Stephen Haskin

CEO, Buildup

Yael Sherman

CTO and Co-Founder, Buildup

Investor Team