Darrell Zhang is a tech entrepreneur with a passion for sustainability and innovation. With a Bachelor's in Engineering and a Minor in Technopreneurship from National University of Singapore, Darrell is the co-founder of several successful startups, such as Optiras, Bike Roger, Intraix, and Bosslee Coffee. He is also a former Solar Specialist at Cripton Environmental Engineering and an adjunct lecturer at Nanyang Polytechnic. Darrell's expertise comprises Solar Thermal Technology, Project Management, Sales Pitching, Business Management, Energy Efficiency, Entrepreneurship, Solar Photovoltaic Technology, Venture Investment, Internet of Things, Smart Homes, Smart Buildings, Smart Condominium, Smart Living, NB-IoT, Narrowband IoT, Property Developers, Real Estate, and Blockchain Real Estate. Currently, he is the Co-Founder at NextBlock, where he provides a hyperlocal digital platform for neighbors and various stakeholders within an estate neighborhood.