Senior iOS SDK Engineer

Senior iOS SDK Engineer

osapiens

Madrid, Spain

Your Responsibilities

• Design, build, and maintain native iOS modules in Swift that expose platform capabilities (offline sync, background processing, device integrations) to React Native applications
• Own the React Native bridge layer, including Objective-C bridging headers and native module architecture
• Optimize SDK performance with focus on memory management, battery efficiency, and startup time
• Stay current with iOS platform evolution (new APIs, Swift language features, Xcode tooling) and integrate relevant capabilities into the SDK
• Build and maintain automated test suites and CI/CD pipelines in Azure DevOps
• Collaborate with app development teams to understand their needs and provide excellent developer experience
• Contribute to SDK documentation and versioning strategy

Your Experience

• Strong proficiency in Swift and the iOS SDK (UIKit/SwiftUI, Core Data, networking, background execution)
• Experience building frameworks, libraries, or SDKs consumed by other developers
• Familiarity with React Native native module development (or willingness to learn quickly)
• Solid understanding of memory management, threading, and performance optimization on iOS
• Experience with Xcode build systems, code signing, and distribution
• English is our working language; fluency in written and spoken English is required

Nice to Have

• Experience with Objective-C and Swift/ObjC interoperability
• Knowledge of TypeScript and React Native architecture
• Experience with offline-first mobile architectures and data synchronization
• Familiarity with CI/CD for mobile (Azure DevOps, Fastlane, or similar)
• Experience with Android/Java and/or Windows/Objective-C development