Worked on the canonical/imagecraft repository to enhance backend code quality by addressing static type-checking issues in partition number helpers. Focused on Python development, the work involved expanding type annotations to cover HybridVolume alongside existing GPTVolume and MBRVolume types, ensuring that runtime behavior matched static typing expectations. Updated unit tests and mocks to align with stricter type requirements, which improved test reliability and maintainability. By removing risky type ignore statements and achieving clean lint results, the changes reduced long-term maintenance risk and laid a foundation for future MBR and Hybrid feature development, demonstrating a methodical approach to type safety and backend robustness.