Andy LeClair focused on documentation-driven development for the elixir-lang/expert repository, leading a comprehensive rebranding effort to transition all references from Lexical to Expert. Using Markdown and leveraging strong documentation skills, Andy systematically updated installation guides and related documentation to ensure consistency and reduce user confusion during the brand transition. The work emphasized accuracy, auditability, and standardized terminology, enabling a smoother onboarding process and supporting marketing alignment for the new Expert brand. No code changes were required, as the primary deliverable centered on maintaining high-quality, traceable documentation that supports both user experience and organizational clarity during the rebranding process.