Design, development, and evolution of Android architecture, frameworks, and performance-critical systems. Collaborate with product, design, and platform leads to define technical strategy and ensure high-quality feature delivery. Set coding standards and best practices across Android teams. Guide others through code reviews, architecture discussions, and design documentation. Identify cross-cutting concerns and lead platform-wide initiatives. Act as a technical mentor for junior engineers. Champion high performance, scalability, and maintainability. Foster cross-platform and cross-squad collaboration. Run design reviews and improve alignment with iOS and backend counterparts.