Senior iOS Developer

Job Title: Senior iOS Developer (Native iOS Mobile App + AWS)Location: Washington, DC / HybridDuration: 12+ MonthsJob OverviewDesign, build, and support native iOS frontline applications and the cloud services they consume.The position focuses on reliable passenger-facing operational workflows, offline transaction continuity, secure mobile integrations, and reusable app components that serve conductors and station/onboard employees.Key ResponsibilitiesDevelop and maintain native iOS features using Swift and applicable Objective-CImplement ticket scan/search, passenger and manifest presentation, ancillary identification, check-in/lift workflows, and safe transaction-state transitions.Maintain offline-first data storage, local transaction queues, conflict handling, reconnection/replay, and approved peer-to-peer synchronization patterns (e.g., Ditto/Infinite PeerConnect where used).Integrate iOS clients with AMG/BFF REST APIs using approved OAuth/OIDC flows, secure storage, request correlation, and defensive error handling.Build reusable JSON/configuration-driven UI elements, forms, role-targeted surveys, and feature-flagged behaviors where approved.Improve performance, accessibility, lifecycle/threading safety, crash resilience, and usability on supported iPhone/iPad generations.Instrument workflows with Dynatrace mobile RUM, privacy controls, crash symbolization, and measurable performance telemetry.Partner with backend developers on contract tests, API evolution, idempotency, and synchronized mobile/server data models.Required SkillsExperience with AWS API Gateway, Lambda, ECS Fargate, Cognito/Entra identity, or Spring Boot APIs.Experience with Ditto/peer synchronization, Core Data, Bluetooth peripherals or barcode scanning hardware.Experience with Dynatrace RUM, accessibility/VoiceOver, App Intents/Shortcuts, or enterprise MDM deployment.Familiarity with reservation, transportation, retail ticketing, or other high-availability frontline systems.