Worked on the microsoft/vscode-python-environments repository to address a reliability issue with Python interpreter path expansion and interpreter selection in Visual Studio Code. Focused on improving how the python.defaultInterpreterPath setting resolves variables such as ${workspaceFolder}, the work stabilized interpreter selection across multi-workspace scenarios. Using TypeScript and leveraging full stack development skills, the solution involved refining environment resolution logic and enhancing unit tests to reduce flaky continuous integration runs. This targeted bug fix led to clearer interpreter resolution, fewer runtime surprises for users, and decreased support overhead, ultimately improving the reliability of Python environment selection and test stability within the extension.