The primary responsibility of a startup CMO is to build and maintain a strong relationship with customers. As a startup evolves and grows, the role of CMO evolves, as well.
In early stages, say when you don't have a product yet built, the CMO should build interest in people by communicating to the world about the problem and how the startup is solving it. He should reach out to potential buyers through different channels. A good example to follow is Marketo, they had some 16000 people ready to buy their product when they launched, they built interest in people through blogging and other activities. Once the product is launched, CMO will engage with the customers and collect feedback from them to improve the product. Once the product achieved product -market fit, CMO will supervise the lead generation, brand building and other activities.
Develop and implement long-term and annual business/marketing plans
Manage and hire a high-performing team based on strengths, talents, group dynamics and business needs while providing clear direction, feedback and development to direct reports
Create and present highly polished, inspiring presentations for brands, retailers, partners, executive management and Board of Directors
Own P&L management, marketing initiative ROI analysis, and key performance metric reporting
Coordinate teams devoted to user growth, activation and retention, PR, and marketing partnerships while managing and building relationships with key agency partners
Build a strong analytics engine to measure performance and inform decisions for prioritizing and optimizing all marketing campaigns, with a focus on spend efficiency across all programs