Worked on the pyccel/psydac repository to deliver a unified preconditioned solver interface, refactoring the linear solver architecture to integrate preconditioners directly within solver classes. This approach removed the need for separate preconditioned solver classes, simplifying the API and enabling more flexible solver configurations for users. The work involved Python programming and applied skills in linear algebra, numerical methods, and software engineering. Additional improvements included making solver names case-insensitive, clarifying property names, and adding warnings for complex matrix scenarios. Enhanced unit testing increased reliability, while documentation and co-authorship updates improved maintainability and onboarding for future contributors to the project.