Senior iOS App Developer for Cross-Platform App Build Rollout

Silverline Labs

Freelance · Remote · Flexible hours

About the role

Silverline Labs is modernizing a legacy production platform that must stay online 24/7. We need an iOS App Developer to rewrite core modules, introduce SwiftUI, and ensure zero‑downtime deployments while preserving existing user experience.

Key responsibilities

• Refactor legacy Objective‑C codebases into clean Swift architecture
• Implement feature flags and blue‑green releases for seamless updates
• Integrate existing REST APIs with modern networking layers
• Write unit and UI tests to guarantee stability during rollouts
• Collaborate with backend and DevOps teams to align deployment pipelines

Must-have skills

• 5+ years of iOS development, strong Swift proficiency
• Deep experience with REST API integration and JSON handling
• Proven track record of zero‑downtime releases in production
• Familiarity with CI/CD tools for mobile apps

Nice to have

• Experience with SwiftUI and Combine
• Knowledge of App Store Connect automation
• Background in performance profiling and optimization