Sr. iOS & SDK Engineer - (BLE Exp required)

Job description

We are looking for a highly skilled **Senior iOS SDK Engineer** to lead the development of next-generation iOS SDKs powering our wearable ecosystem, including smartwatches, smart rings, and health-focused connected devices. The ideal candidate will have strong expertise in iOS application and **SDK development, Bluetooth Low Energy (BLE) communication** , API design, and mobile architecture. You will work closely with firmware, cloud, algorithm, and app teams to build scalable, developer-friendly SDKs that enable seamless integration of wearable devices with iOS applications. **Responsibilities:** - Design, develop, and maintain iOS SDKs for wearable devices. - Build robust BLE communication layers for device pairing, authentication, synchronization, OTA updates, and real-time data streaming. - Develop SDK APIs for health, fitness, notifications, device controls, and sensor data access. - Define SDK architecture, versioning strategy, backward compatibility, and release processes. - Collaborate with firmware teams to define BLE services, GATT profiles, and communication protocols and to integrate health and wellness features such as heart rate, SpO₂, sleep, activity, and stress monitoring. - Optimize SDK performance, battery consumption, memory usage, and connection reliability. - Create developer documentation, sample applications, integration guides, and debugging tools. - Lead technical discussions and mentor junior engineers. - Drive SDK quality through automated testing, CI/CD pipelines, and code reviews. **Required Qualifications:** - Bachelor's or Master's degree in Computer Science, Electronics, or related field. - 3+ years of software development experience with at least 4 years in iOS development. - Strong proficiency in Swift and Objective-C. - Experience building and publishing reusable iOS SDKs/frameworks. - Deep understanding of Bluetooth Low Energy (BLE), CoreBluetooth, and Apple connectivity frameworks. - Strong knowledge of iOS architecture patterns (MVC, MVVM, Clean Architecture). - Experience with dependency management tools such as Swift Package Manager, CocoaPods, or Carthage. - Familiarity with REST APIs, WebSockets, and cloud-connected applications. - Experience debugging BLE communication using tools such as nRF Connect, Wireshark, or protocol analyzers. - Strong understanding of software design principles, multithreading, and performance optimization. **Preferred Qualifications** - Experience working on smartwatch, smart ring, fitness tracker, hearable, or other wearable products. - Experience implementing OTA firmware update workflows. - Familiarity with Apple HealthKit, Health Connect integrations, and health data synchronization. - Understanding of sensor technologies including PPG, IMU, temperature, and bio-sensing systems. - Experience with BLE security, encryption, bonding, and privacy mechanisms. - Knowledge of CI/CD pipelines, automated testing, and SDK distribution platforms. - Experience working with cross-platform mobile teams and Android SDK counterparts.