Worked on the ohcnetwork/care repository to enhance API resilience by addressing input validation and error handling for facility_type fields. Applied backend development skills in Python to introduce a field validator that checks facility_type against allowed values, returning a 400 error with valid options instead of a server-side 500 error. Implemented pre-deserialization checks to catch potential KeyErrors before they could cause crashes, and improved error messaging to provide clients with clearer guidance. This work focused on data validation and robust error handling, resulting in reduced downtime from invalid inputs and a more reliable, user-friendly API experience for consumers.