Design and document engaging game systems, core loops, features, and user flows for mobile card and social games. Create clear Game Design Documents (GDDs), wireframes, feature specs, and mockups. Research and benchmark competitor games for design trends, mechanics, and monetization. Collaborate with product, analytics, and LiveOps teams for data-driven design decisions. Develop and iterate on monetization mechanics, in-game economies, and player progression systems. Design systems to drive player engagement, retention, and LTV. Participate in feature scoping, sprint planning, and agile processes. Provide feedback during playtests and reviews to ensure design intent. Maintain thorough documentation for scalability and team onboarding.