Senior iOS & AWS Engineer - Onsite DC (Contract)

Randstad Digital

Washington (District of Columbia)

On-site

USD 103,000 - 117,000

Full time

4 days ago

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Job summary

Randstad Digital in Washington, DC seeks a Senior Full Stack iOS Engineer to design, build, and maintain native frontline mobile apps and AWS cloud services for an enterprise transportation client. You will lead high-availability architectures and data integrity in a SAFe environment, delivering zero-downtime workflows for conductors and station staff.

Join a cross-functional team working on ticket scanning, real-time tracking, and secure backend integrations, with onsite hybrid collaboration

Qualifications

Proven track record building enterprise native iOS applications in production using Swift and Objective-C.
Hands-on experience architecting offline-first mobile systems, Core Data persistence, local queues, and peer-to-peer or edge synchronization.
Practical backend experience designing or integrating AWS services (API Gateway, Lambda, ECS Fargate, Cognito/Entra ID) or Spring Boot microservices.

Responsibilities

Architect, develop, and maintain high-performance native iOS applications utilizing Swift, Objective-C, and modern concurrency models.
Build robust, offline-first data architectures featuring local transactional queues and peer-to-peer sync.
Deliver end-to-end frontline workflows including barcode/ticket scanning, manifest management, and check-ins with peripheral device integrations via Bluetooth.