• Design, build, and maintain ES partner interfaces and internal data flows connecting EDB/IVM/VistA REE to the modernized ES. • Implement and govern API and message standards (REST/JSON, SOAP, Kafka/AMQP) including versioning, documentation, and backward compatibility. • Create integration patterns for synchronous and asynchronous processing, idempotency, retry/backoff, correlation IDs, and dead-letter handling. • Develop transformation and orchestration logic (e.g., Camel/Spring Integration/NiFi) to normalize legacy payloads and enforce contract schemas. • Collaborate with data teams on mapping, lineage, validation, and reconciliation to ensure end-to-end accuracy across enrollment workflows. • Embed integration testing into CI/CD (contract tests, consumer-driven tests, mock services) and automate environment configuration. • Instrument integrations for observability (Splunk/Azure Monitor), define interface SLOs, and publish runbooks and dashboards. • Engineer authentication and authorization across interfaces (OAuth2/OIDC, mutual TLS, API gateways); enforce least-privilege and secrets management. • Harden integrations to VA standards (FedRAMP, FISMA, IRS 1075, HIPAA) and align with Section 508 accessibility for user-facing endpoints. • Support incident response: triage, root-cause analysis, replay/compensation strategies, and postmortems for interface failures. • Optimize performance for high-volume eligibility and enrollment transactions, including schema/payload tuning and batching strategies. • Contribute to transition plans, cutover rehearsals, and partner onboarding; develop checklists and training for operations teams.