Note: The job is a remote job and is open to candidates in USA. Lumen Solutions Group Inc. is recruiting for a confidential client seeking a Senior Native iOS Developer/Engineer. The role develops and supports native iOS applications, offline-first data synchronization, and integrations with AWS-hosted backend services, while contributing to enterprise deployment, performance monitoring, and production support.

Responsibilities

• Design, develop, enhance, and maintain native iOS applications using Swift and Objective-C
• Build mobile features supporting ticket scanning, passenger manifests, ticket searches, and check-in workflows
• Develop reusable mobile components, forms, and user interfaces
• Implement reliable transaction processing and application workflows
• Optimize applications for supported iPhone and iPad devices
• Develop applications that function reliably with limited or no network connectivity
• Implement offline data storage, local transaction queues, and synchronization processes
• Handle transaction conflicts, reconnection, and replay of queued operations
• Implement peer-to-peer synchronization using technologies such as Ditto or similar solutions
• Maintain data consistency between mobile devices and backend systems
• Prevent duplicate transactions and data inconsistencies during synchronization
• Integrate native iOS applications with AWS-hosted backend services and REST APIs
• Work with AWS API Gateway, Lambda, ECS Fargate, and Cognito
• Integrate mobile applications with Spring Boot REST APIs
• Implement secure authentication and authorization using OAuth 2.0 and OpenID Connect (OIDC)
• Support secure token management, API communication, and error handling
• Collaborate with backend teams on API contracts, data models, and transaction processing
• Integrate mobile applications with barcode scanners and Bluetooth peripherals
• Support enterprise Mobile Device Management (MDM) deployment environments
• Ensure application stability across supported iPhone and iPad devices
• Address device lifecycle, threading, memory management, and performance issues
• Implement accessibility requirements, including VoiceOver
• Monitor mobile application performance using Dynatrace Real User Monitoring (RUM)
• Troubleshoot application crashes, performance issues, and synchronization failures
• Improve application responsiveness, reliability, and usability
• Support production troubleshooting and end-to-end mobile/backend integration
• Participate in Agile and SAFe delivery practices
• Collaborate with backend engineers, architects, QA teams, and business stakeholders
• Participate in application design, development, testing, and production support
• Contribute to technical design decisions and reusable development practices

Skills

• Strong hands-on experience in native iOS application development using Swift
• Experience maintaining and supporting existing Objective-C components
• Strong experience with iOS SDK, Xcode, and iPhone/iPad applications
• Experience with offline-first mobile application architecture
• Hands-on experience with Core Data and local data persistence
• Experience implementing transaction queues, conflict resolution, and data synchronization
• Experience integrating mobile applications with REST APIs
• Working knowledge of AWS services, including API Gateway, Lambda, ECS Fargate, and Cognito
• Experience with OAuth 2.0 and OpenID Connect (OIDC)
• Experience integrating with Spring Boot or comparable backend services
• Knowledge of peer-to-peer synchronization technologies such as Ditto or similar solutions
• Experience with Dynatrace Mobile RUM and application performance monitoring
• Experience integrating barcode scanners and Bluetooth peripherals
• Experience with enterprise MDM deployments
• Knowledge of iOS accessibility and VoiceOver
• Experience with SAFe Agile methodology
• Background in transportation, passenger rail, ticketing, retail POS, logistics, or transaction-intensive mobile applications
• Experience developing high-availability applications for frontline operational users

Benefits

• Remote, with quarterly travel for PI meeting.

Company Overview

• Lumen Solutions Inc., is a dynamic small and minority-owned, Disadvantaged Business Enterprise headquartered in Virginia, USA. It was founded in 1998, and is headquartered in Sterling, Virginia, USA, with a workforce of 51-200 employees. Its website is https://lumensolutions.com.

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