Worked on establishing the foundation for the 4DVarNet reimplementation in JAX within the Diff4Earth/ige-jaxathon-2025 repository. Developed a comprehensive project planning and metrics document using Markdown, outlining objectives, deliverables, and measurable success criteria for comparing JAX and PyTorch implementations. Focused on documentation and project planning skills to enable early team alignment and provide a single source of truth for onboarding. Defined a cross-framework evaluation framework to assess accuracy, speed, and memory usage, ensuring clear benchmarks for future development. The work provided essential structure and clarity for the project’s next phases, emphasizing process and technical rigor over code delivery.