Worked on enhancing the QuantumCircuit.compose API in the Qiskit/qiskit repository by improving its type annotations to support better static analysis and developer experience. Focused on object-oriented programming principles and type hinting in Python, the work introduced overload signatures for the 'other' parameter and the return type, enabling more robust IDE autocompletion and safer API usage. This targeted feature delivery aimed to improve maintainability and onboarding for contributors, laying a foundation for long-term code quality. No bug fixes were addressed during this period, as efforts concentrated on delivering this feature with a focus on clarity and future extensibility.