Senior iOS Engineer - Offline-First & AWS Backend (DC)

ZipStaff Inc.; Washington (District of Columbia); On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Health Insurance

Dental Insurance

Vision Insurance

401(k) + 401(k) matching

Paid time off

Referral Program

Job summary

ZipStaff Inc. is seeking a Senior Full Stack iOS Engineer to design, build, and maintain mission-critical frontline mobile apps and the supporting AWS cloud services for a transportation leader.

On-site in Washington, DC, you will drive offline-first architectures, real-time tracking, and secure integrations within SAFe. You will own iOS development with Swift/Objective-C, implement peer-to-peer sync, Bluetooth integrations, and BFF REST APIs on AWS, collaborating with backend and platform teams

Qualifications

• Proven track record delivering enterprise iOS apps in production with Swift and Objective-C.
• Experience designing offline-first mobile systems with local persistence and sync.
• Backend integration experience with AWS services such as API Gateway, Lambda, ECS, Cognito.
• Experience integrating external hardware like barcode scanners or Bluetooth devices.

Responsibilities

• Architect, develop, and maintain high-performance native iOS apps using Swift and Objective-C.
• Design offline-first data architectures with local queues and peer-to-peer sync.
• Deliver front-line workflows including barcode scanning, manifest management, and check-in states.
• Integrate mobile clients with AWS REST APIs using OAuth/OIDC and secure storage.
• Build reusable UI components, feature flags, and dynamic forms for iPhone and iPad.
• Instrument apps with Dynatrace RUM and ensure crash resilience and privacy safeguards.
• Collaborate with backend teams on API idempotency and data schemas in SAFe.
• Participate in PI planning and capacity planning for Washington, DC onsite.

Skills

Swift

Objective-C

Offline-first design

AWS backend integration

Peer-to-peer synchronization

Bluetooth/BLE

SAFe agile

iOS performance

Dynatrace RUM

Tools

Ditto

Infinite PeerConnect

Dynatrace

Job description

ZipStaff Inc. is seeking a Senior Full Stack iOS Engineer to design, build, and maintain mission-critical frontline mobile apps and the supporting AWS cloud services for a transportation leader.

On-site in Washington, DC, you will drive offline-first architectures, real-time tracking, and secure integrations within SAFe. You will own iOS development with Swift/Objective-C, implement peer-to-peer sync, Bluetooth integrations, and BFF REST APIs on AWS, collaborating with backend and platform teams