A CIO (Chief Information Officer) in a startup is responsible for overseeing the company's technology strategy, infrastructure, and digital innovation. They ensure that the IT systems align with business goals, manage cybersecurity risks, and optimize technology investments. Unlike CIOs in larger corporations, startup CIOs often wear multiple hats, working closely with product development, data analytics, and scaling technology solutions. Their role is crucial in driving efficiency, innovation, and competitive advantage in a fast-paced startup environment.