• Design, develop, and sustain MUMPS routines and VistA REE packages; refactor legacy code to improve reliability, performance, and maintainability. • Analyze and document existing VistA REE workflows (registration, eligibility, enrollment) to inform migration and integration with ES. • Implement integration bridges between VistA REE and ES using HL7, RPCs. • Develop data extraction, normalization, and reconciliation utilities to migrate REE data into ES with full lineage and auditability. • Perform ongoing maintenance: bug fixes, performance tuning, routine maintenance, and documentation upkeep. • Track, analyze, and resolve Tier 2/3 user-reported issues with minimal disruption. • Support monitoring activities; proactively identify issues and contribute to optimization. • Support secure operations and compliance activities (FedRAMP, FISMA, IRS 1075, HIPAA); assist with patching and remediation. • Implement enhancements and upgrades based on priorities, feedback, and refinements. • Support integration/configuration coordination to maintain interoperability with other systems.