Senior iOS Engineer (AWS) - Offline-First, HA Systems

Randstad Digital Americas; Washington (District of Columbia); On-site; USD 103,000 - 117,000; Part time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401(k) plan

Short-term disability

AD&D insurance

Job summary

Randstad Digital Americas 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 in Washington, DC. You will lead architecture for high-availability, offline-first workflows used by conductors and station personnel.

Work within SAFe, drive iteration planning, ensure zero-downtime data integrity, and deliver secure backend integrations with OAuth/OIDC.

Qualifications

• Proven track record building enterprise native iOS apps in production with Swift and Objective-C.
• Experience architecting offline-first mobile systems with Core Data and peer-to-peer sync.
• Backend experience with AWS services including API Gateway, Lambda, ECS Fargate, Cognito/Entra ID.
• Experience integrating external hardware peripherals (barcode scanners, Bluetooth devices).
• Knowledge of mobile performance optimization, thread safety, and telemetry.
• SAFe experience with leading sprint planning and capacity planning in DC.

Responsibilities

• Architect, develop, and maintain high-performance native iOS apps using Swift and Objective-C.
• Build offline-first data architectures with local queues and peer-to-peer sync.
• Support barcode scanning, manifest management, and device integrations via Bluetooth.
• Design mobile clients with AWS REST APIs, including OAuth/OIDC authentication.
• Create reusable UI components, feature flags, and role-based workflows for iPhone/iPad.
• Instrument apps with Dynatrace RUM and privacy safeguards.
• Collaborate with backend and platform teams on testing, idempotency, and data schemas.
• Attend SAFe ceremonies and PI planning in Washington, DC.

Skills

Swift

Objective-C

Offline-first design

SAFe experience

AWS services knowledge

Performance optimization

Hybrid teamwork

Education

Bachelor's degree

Tools

API Gateway

AWS Lambda

ECS Fargate

Cognito/Entra ID

Spring Boot

OAuth/OIDC

Bluetooth

Job description

Randstad Digital Americas 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 in Washington, DC. You will lead architecture for high-availability, offline-first workflows used by conductors and station personnel.

Work within SAFe, drive iteration planning, ensure zero-downtime data integrity, and deliver secure backend integrations with OAuth/OIDC.