Senior iOS SDK Engineer

Job title: Senior SDK Engineer (iOS) Location: 100% REMOTESalary: $130-170k/year + EQUITY!Requirements: SDKs/ frameworks, Apple platform knowledge, APIs, debuggingFounded by one of the Scopely founders (~$5B exit in 2023 with 8 #1 games including MonopolyGo, Scrabble, Yahtzee, and Star Trek), we are a growth-stage Series B startup that's modernizing full-stack observability. We're backed by NEA, YCombinator, Greycroft, the founders of Testflight, Parse, and PagerDuty, and executives from AppDynamics, MoPub, Doordash, and Uber. We are the evolution of real-user monitoring (RUM) built on OpenTelemetry. Teams choose us because NO OTHER observability platforms are purpose built for frontend mobile and web teams while providing devops with the vital information they need to drive proactive & confident decisions. As we continue to grow, we need your help!We're currently looking for a Senior iOS SDK Engineer to join our Mobile Observability team. This role focuses on building and maintaining a high-performance, open-source Swift SDK used across all Apple platforms. You'll work close to the OS to create instrumentation libraries for performance monitoring, telemetry, hang detection, and crash reporting, while collaborating with other platform teams and contributing to standards like OpenTelemetry. What you'll be doing:Design, build, and maintain a modular Swift SDK used across all Apple platforms.Implement core instrumentation features including crash reporting, hang detection, performance monitoring, and telemetry capture.Build resilient data pipelines for offline storage, batching, retries, and efficient delivery under strict mobile runtime constraints.Shape SDK architecture and API design, ensuring clarity, stability, and long-term backward compatibility.Debug complex platform issues involving threading, memory, lifecycle behavior, and OS/device fragmentation.Develop capture services for networking, user interactions, and system events using frameworks like MetricKit.Optimize performance across startup time, binary size, memory usage, and thread safety.Collaborate with cross-platform SDK teams (React Native, Flutter, Unity) to prevent downstream breaking changes.Contribute to OpenTelemetry alignment and upstream standards work.Partner with Product and Customer Success to incorporate developer feedback into the SDK roadmap.What you need for this position: Hands-on SDK or framework experience, building libraries used by other developers.Deep knowledge of Apple runtime behavior - memory, threading, lifecycle, and startup performance.Strong production debugging skills across diverse devices and OS versions.API design experience, including versioning and long-term evolution.Understanding of binary compatibility and ABI stability.Comfort with Git and modern CI/CD pipelines.Openness to AI-assisted engineering workflowsBonus skills: Familiarity with Swift macros or Swift Syntax tooling.Knowledge of OpenTelemetry or observability concepts (traces, spans, logs).Experience supporting multiple Apple platforms from a shared codebase.Exposure to system frameworks like MetricKit or MXDiagnostic.Ability to work in a multi-SDK ecosystem (React Native, Flutter, Unity).Open-source contributions.Experience supporting external developers or SDK users.Benefits:$140k-170k/year + EQUITY!Unlimited PTOMedical, Dental, & Vision InsuranceParental leave for BOTH parents Annual company trip :-)Internet stipend$500 desk allowance to set up your home officeOpportunities for learning & growth Benefits