Objective-C / Swift Application DeveloperLegal Entity: LTTS US BranchLocation: Cupertino, CaliforniaJob Description & Skill Requirement:Required Qualifications:• 5-7 years of professional iOS development experience with Swift and Objective C in production apps or SDKs.• Strong command of iOS frameworks: UIKit, SwiftUI, Foundation, StoreKit, Core Data (or alternative persistence), Core Animation, Background Tasks, Local Notifications.• Expertise in Swift Concurrency (async/await) and/or Combine, plus legacy concurrency models (GCD, NSOperation).• Proven experience building SDKs/libraries consumed by multiple apps, with focus on API design, semantic versioning, and backward compatibility.• Deep understanding of ATT, SKAdNetwork, and privacy-preserving measurement; hands-on with postbacks, conversion value strategies, and attribution windows.• Solid networking fundamentals: request/response lifecycle, caching, ETags, error handling, and resilience patterns.• Track record of performance tuning (Instruments: Time Profiler, Allocations, Leaks, Energy, Network), memory management, and binary size optimization.• Strong testing discipline: XCTest, XCUITest, mocks/stubs, dependency injection, hermetic tests, and CI workflows (Xcode Cloud, Jenkins, GitHub Actions).• Excellent communication skills and the ability to collaborate in a cross-functional, privacy-first product environment.Technical Stack & Tools:• Languages: Swift (5.x+), Objective C• UI: SwiftUI, UIKit, Auto Layout• Concurrency: Swift Concurrency, Combine, GCD/NSOperation• Networking: URLSession, background tasks, Codable/JSON, protobuf (optional)• Data: Core Data / SQLite / file-based persistence• Build & CI: Xcode, SPM/CocoaPods, Fastlane, Xcode Cloud/Jenkins/GitHub Actions• Testing: XCTest, XCUITest, snapshot testing (iOSSnapshotTestCase), Instruments• Security: Keychain, certificate pinning (where applicable), secure storage• Observability: Unified logging, metrics collectors, crash analyticsEducation:• Bachelor's/Master's in Computer Science, Engineering, or equivalent practical experience.