Worked on enhancing the Qiskit/qiskit repository by improving the documentation and test coverage for the PolynomialPauliRotations class. Focused on clarifying the behavior of arithmetic and adder gates, providing explicit mathematical definitions for X, Y, and Z basis rotations, and adding validation tests to ensure correctness across different bases. Utilized Python and unit testing to strengthen API clarity and reduce the risk of incorrect usage in quantum computing workflows. The work emphasized making the codebase more accessible for contributors and improving reliability by preventing regressions, ultimately supporting better onboarding and maintenance for the Qiskit quantum computing framework.