QA Engineer - Swift Macos

QA Engineer - Swift macOS Summary At Client, new ideas have a way of becoming excellent products, services, and customer experiences very quickly. Bring passion and dedication to your job and there's no telling what you could accomplish! Client is a place where extraordinary people gather to do their best work. Just be ready to dream big. The workplace today is flooded by applications, but organizations struggle to integrate and automate processes that run across them. At Client, we are building a better way for the world's 500 million knowledge workers to do their jobs better. We accomplish this by empowering them to automate their processes and integrate data across all their applications in a matter of days thanks to an easy-to-use visual platform. If you're passionate about testing intelligent software that runs where customer data lives, love APIs, and want to be part of a team that's shaping the future of how people work, this is your team. You'll help ensure that the tools our customers depend on are reliable, secure, and ready for the real world. Description We are looking for a QA engineer who uses Swift to test software that helps organizations make sense of their data. This is an opportunity to join a team building solutions where quality is the product. You'll work across macOS system services, multi-process architectures, and performance-sensitive components to make sure what we ship works the way customers expect. To be successful, you will bring creative energy to collaboration, communication, and producing high-quality deliverables. You'll work on problems that matter. The software you test protects customer data, keeps critical systems running, and delivers tools that organizations from schools to hospitals trust every day. We're looking for someone who solves problems, takes initiative, and cares about the people who use what we build. Minimum Qualifications Computer Science-Software Engineering Degree or equivalent software engineering experience Hands-on experience with testing by using Behavior Driven Development (BDD) or Test-driven development (TDD) methodology, along with analytical thinking to build clear, concise, and comprehensive test scenarios. Preferred Qualifications Strong problem-solving and analytics skills, with the ability to investigate, debug and triage issues in complex multi-process macOS applications independently and cooperatively. Practical experience with Swift programming language and testing tools/frameworks (e.g. XCTest, Swift Testing with @Test/@Suite/#expect, Xcode Instruments). Familiar with xcodebuild CLI and CI integration. Experience with testing macOS server software, including process lifecycle management (launchd, SMJobBless), code signing, notarization, and installation/upgrade workflows. Experience testing actor-based Swift concurrency, including data race detection with Thread Sanitizer (TSan) and strict concurrency checking. Familiarity with long-running stability and soak testing. Strong understanding of RESTful API, OpenAPI specification, SSE (Server-Sent Events), and service testing. Experience testing solutions utilizing WebSockets and JWT/OAuth validation is desired. Familiarity with performance testing on macOS, including Xcode Instruments profiling (Time Profiler, Allocations, Leaks) and resource constraint testing. Experience testing AI-integrated features or machine learning pipelines, including validating model outputs, latency, and deterministic behavior. Familiarity with Model Context Protocol (MCP) or similar tool-use frameworks is a plus. Experience in Agile software development methodologies/Scrum and rapid releases. Strong communication and cross-functional collaboration skills. Responsibilities Design, develop, and maintain automated test suites in Swift using XCTest and Swift Testing frameworks. Test macOS server software across process lifecycle events including installation, upgrade, crash recovery, and uninstall. Validate REST API endpoints, SSE streams, and WebSocket connections through functional and integration testing. Profile application performance using Xcode Instruments and identify regressions in latency, memory, and resource usage. Investigate and triage concurrency issues using Thread Sanitizer and strict concurrency checking. Collaborate with developers to define testability requirements early in the development cycle. Build and maintain CI pipelines using xcodebuild for automated test execution across configurations. Execute long-running stability and soak tests to validate system reliability under sustained load. Test code signing, notarization, and installer packaging workflows for macOS distribution. Participate in sprint planning, backlog grooming, and release readiness reviews. \