Francisco Videira enhanced the NHSDigital/e-referrals-service-api by evolving its API schema to improve traceability and identification of referrals and communications. He introduced a non-breaking change by adding an identifier array, consisting of system and value pairs, to both ReferralRequest and CommunicationRequest resources within the FHIR STU3 component. This update enables unique identification (ers-request-id) and supports better auditing, reconciliation, and downstream analytics. Francisco utilized YAML for schema definition and demonstrated skills in API development and Git-based change management. The work focused on schema evolution rather than bug fixes, reflecting a targeted and well-scoped engineering contribution for the month.