Senior MacOS QA Engineer

5+ years in QA for macOS applications, with a focus on security, system-level, or compatibility testing. Strong understanding of macOS internals: System Extensions, Endpoint Security, XPC, TCC, SIP, Launch Services, file systems, etc. Familiarity with macOS diagnostic and monitoring tools (e.g., Console, Activity Monitor, Instruments, fs_usage, dtrace, tcpdump, lldb). Experience testing low-level products (VPNs, endpoint security, antivirus, etc.). Ability to read crash reports, debug logs, and identify root causes. Ability to work independently and deeply investigate issues before escalating. Excellent written communication for clear test case documentation and bug reports.

Test macOS security features that span across system extensions, Endpoint Security, and Network Extension frameworks. Design and execute manual test plans for system extensions, inter-process communications (XPC), and low-level OS integration points. Explore and document edge cases, race conditions, compatibility scenarios, and regressions across macOS versions. Reproduce and isolate complex issues related to sandboxing, SIP/TCC interactions, launch services, and daemon behaviors. Work directly with development, support, product, and automation teams to triage, verify, and regress bugs and compatibility issues. Validate interactions between the company and third-party macOS apps and services. Collaborate with SDETs to turn exploratory and regression cases into automation candidates. Maintain deep familiarity with changes in macOS releases and how they might impact functionality and compatibility.