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Meet the Team

Simon Barber

Simon Barber | Chief Technology Officer

Barber’s ground-breaking 2011 paper, Bitter to Better — How to Make Bitcoin a Better Currency first laid out the ways in which Bitcoin could grow into a stable, long-lived currency. In 2011, he proposed development of an ASIC chip developed specifically for Bitcoin mining, but investors were skeptical. Barber was undeterred. By 2013, savvy investors saw the potential Barber had talked about. (“Simon, I was wrong,” one wrote.) Soon after, HashFast was born.

Barber was previously an engineer and researcher at Palo Alto Research Center (PARC), a highly-influential technology think tank behind technologies such as Ethernet, Windows and the mouse. While serving as the organization’s lead researcher for wireless technologies, he began his pioneering study on Bitcoin.

A perpetually curious man, Barber is well-known in technology circles. In 2000, he founded Devicescape, a provider of advanced WiFi solutions for mobile platforms, and for eight years worked as the company’s lead technologist. Today, the company serves mobile bandwidth to millions of cellular subscribers, slashing its customers’ bandwidth bills, and rewarding its shareholders. Barber served as a technical editor at the IEEE 802.11 standard. He serves as consultant and technical advisor to numerous companies. In 2005 Barber helped start the WiFi semiconductor company Ozmo Devices, recently sold to ATMEL.

Barber has written seven patent applications. He is a graduate of the University of Cambridge, UK.

Eduardo website pic

Eduardo deCastro | CEO

Eduardo deCastro is a serial entrepreneur with a long track record of success.  In 2013, deCastro was approached by Simon Barber to help develop a revolutionary new Bitcoin mining technology.

This is not the first successful venture for the team. Together, Barber and  deCastro founded Devicescape, and helped create a seamless network of free and reliable WiFi networks throughout the world. As impressively, de Castro was able to secure seven million dollars in funding for the company during one of the biggest economic downturns in history. He served as the company’s CEO from inception through 2003.

Prior to founding Devicescape, de Castro was the General Manager of European Operations at Contact Networks, New Business Development lead at Schlumberger Smart Cards, and a team leader at Andersen Consulting.

DeCastro holds a Bachelor’s from Boston College and an MBA from the University of Texas at Austin.


Amy Woodward | VP of Engineering

Amy brings more than 15 years of experience in companies large and small to HashFast.

Amy most recently came from Engine Yard, where in less than two years she went from Senior Developer to Director of Engineering. She oversaw the development of the flagship product, EY Cloud, growing revenue by over 60% in one year. She managed teams in multiple locations, including creating the Portland engineering office from scratch, and is looking forward to building out HashFast’s team.

Amy has previously worked for Google, Pivotal Labs, and several Bay Area startups, as well as Nortel and the National Research Council of Canada. She holds a Bachelor’s degree in Computer Engineering from McMaster University, Canada.


Chad Spackman

Chad Spackman

Chad Spackman has 30 years experience in analog and digital systems design realized in ASIC and discrete circuits. Chad began his career at Fischer & Porter company designing cards with functions ranging from sensor design, signal conditioning and data acquisition, to microprocessor based network offload cards. ASIC implementations became an essential vehicle in the networking industry and presented Chad with the rare opportunity to do full custom memory, standard cell, and pad design in Silicon, exploiting a lifelong passion for physics and electronics.

In 1996 Chad cofounded Sandgate Technologies which remains in existence today. At Sandgate Chad was involved in every aspect of ASIC design from architecture and coding, to timing closure and layout. The company’s early flagship product was a DRAM compiler allowing realization of very high memory densities in commodity CMOS processes. Sandgate quickly grew to an ASIC services house producing designs in cryptography, compression, and various network offloads.

In 2004, Chad went on to co-found Cebatech Inc. specializing in TCP/IP offloads and compression. After Cebatach, Chad spent 3 years with Open-Silicon beginning in 2010, serving as engineering director and systems architect for Open-Silicon’s Raleigh NC office. In 2013 Chad returned to Sandgate Technologies.

Now a veteran in the ASIC/semiconductor industry, achievements include over a dozen analog designs for various foundries and a multitude of large-scale ASIC designs in the communications sector.

Chad holds a Bachelor of Physics, and Bachelor and Master’s degrees in engineering from the University of Pennsylvania and Penn State University respectively. He is the co-author of 7 patents in the semiconductor and networking fields.