Sr. System Architect_ W2 Location: Washington DC (Need local and 5 days on site) Role Overview: Technical Design Authority responsible for bridging Enterprise Architecture strategy with engineering delivery. You will lead the "Strangler" migration of mission-critical Rail Transportation legacy systems (Mainframe/TPF) to a modern, Java-based cloud-native environment. Key Responsibilities Modernization Leadership: Lead the technical transition from IBM Mainframe/TPF to Java/Spring Boot microser