Leisha Bhandari focused on enhancing API contract fidelity in the mbta/api repository by updating documentation to accurately reflect the data model. She addressed a documentation bug by marking the Facility resource’s latitude and longitude fields as nullable in Swagger, ensuring that API consumers receive precise contract specifications and reducing integration risks. Using Elixir and leveraging her skills in API development and documentation, Leisha’s work improved the reliability of client integrations and maintained clear traceability through issue and commit references. Her attention to detail and collaboration with downstream teams contributed to a more robust and developer-friendly API documentation process.