Senior iOS SDK Engineer

<h2>About the Role</h2> <p>We are looking for a<span class="Apple-converted-space"> </span>Senior iOS SDK Engineer<span class="Apple-converted-space"> </span>to join our Mobile Observability team, responsible for designing, building, and maintaining our<span class="Apple-converted-space"> </span>open-source Swift SDK<span class="Apple-converted-space"> </span>across Apple platforms (iOS, tvOS, watchOS, and macOS).</p> <p>This is a<span class="Apple-converted-space"> </span>hands-on, SDK-first role<span class="Apple-converted-space"> </span>focused on building high-performance instrumentation libraries embedded in customer applications. It is ideal for someone who enjoys working close to the platform, solving difficult edge cases, and designing APIs that other developers rely on.</p> <p>You’ll work on performance monitoring, telemetry capture, hang detection and crash reporting, all designed for minimal overhead and maximum reliability. You’ll collaborate across platform teams and contribute to evolving observability standards such as OpenTelemetry.</p> <h2>What You’ll Do</h2> <ul> <li>Design, build, and maintain a<span class="Apple-converted-space"> </span>modular Swift SDK<span class="Apple-converted-space"> </span>used by developers across Apple platforms</li> <li>Work on<span class="Apple-converted-space"> </span>crash reporting, hang detection, performance monitoring, and telemetry instrumentation</li> <li>Build reliable mechanisms for<span class="Apple-converted-space"> </span>offline storage, batching, retries, and data delivery<span class="Apple-converted-space"> </span>under mobile runtime constraints</li> <li>Contribute to<span class="Apple-converted-space"> </span>SDK architecture, API ergonomics, and backward compatibility</li> <li>Design and evolve APIs with a focus on<span class="Apple-converted-space"> </span>stability, clarity, and long-term compatibility</li> <li>Debug complex issues across devices, OS versions, and app environments, including<span class="Apple-converted-space"> </span>threading, memory, and lifecycle challenges</li> <li>Develop and maintain capture services for<span class="Apple-converted-space"> </span>networking, user interactions, and system events, leveraging frameworks such as<span class="Apple-converted-space"> </span>MetricKit</li> <li>Optimize<span class="Apple-converted-space"> </span>startup performance, binary size footprint, memory usage, and thread safety</li> <li>Coordinate with<span class="Apple-converted-space"> </span>cross-platform SDK teams (React Native, Flutter, Unity)<span class="Apple-converted-space"> </span>to ensure native SDK changes do not introduce downstream breaking issues</li> <li>Collaborate on<span class="Apple-converted-space"> </span>OpenTelemetry alignment and upstream contributions</li> <li>Partner with Product and Customer Success to incorporate<span class="Apple-converted-space"> </span>developer feedback</li> </ul> <hr> <h2>Basic Qualifications</h2> <ul> <li>Strong proficiency in<span class="Apple-converted-space"> </span>Swift, including async/await, structured concurrency, and protocol-oriented design</li> <li>Experience building or maintaining<span class="Apple-converted-space"> </span>SDKs, frameworks, or developer-facing libraries</li> <li>Deep understanding of<span class="Apple-converted-space"> </span>Apple platform runtime constraints:<span class="Apple-converted-space"> </span>memory, threading, lifecycle, startup performance</li> <li>Experience debugging issues in<span class="Apple-converted-space"> </span>production mobile environments</li> <li>Familiarity with<span class="Apple-converted-space"> </span>API design, versioning, and SDK evolution</li> <li>Understanding of<span class="Apple-converted-space"> </span>binary compatibility and ABI stability</li> <li>Strong advocate for<span class="Apple-converted-space"> </span>testing, reliability, and code quality</li> <li>Excellent verbal and written communication skills</li> <li>Experience using ... (truncated, view full listing at source)