A Mixpanel Analytics developer uses Mixpanel, a business analytics service, to track user interactions with web and mobile applications. Their duties include collecting, analyzing, and interpreting user data, providing insights into customer behavior and engagement. They help in making data-driven decisions by creating custom reports and dashboards, and conducting A/B testing. They also implement Mixpanel's APIs into applications for event tracking. Additionally, they work closely with other teams to understand their analytics needs, ensure data accuracy, and assist in improving the product or service based on the data insights. They play a vital role in optimizing user experience and driving business growth.