macOS QA engineer (manual) for endpoint security

As the Senior macOS QA Engineer, you will be responsible for validating the stability, security, and compatibility of a secure macOS platform used to protect sensitive systems. This is a hands-on manual and exploratory QA role (not an automation role) that requires deep, practical experience with macOS internals, system extensions, and application behavior. You will work alongside a highly experienced team of engineers and reverse engineers to design and execute manual test plans that dig into system extensions, inter-process communication, and low-level operating system behavior.

• Test macOS security features spanning system extensions, Endpoint Security, and Network Extension frameworks
• Design and execute manual test plans for system extensions, inter-process communication (XPC), and low-level operating system 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 and 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 platform and third-party macOS apps and services
• Collaborate with SDETs to turn exploratory and regression cases into automation candidates
• Maintain close familiarity with changes in macOS releases and how they may impact functionality and compatibility

• 5+ years of QA experience with macOS applications, with a focus on security, system-level, or compatibility testing
• Strong understanding of macOS internals, including System Extensions, Endpoint Security, XPC, TCC, SIP, Launch Services, and file systems
• Familiarity with macOS diagnostic and monitoring tools such as Console, Activity Monitor, Instruments, fs_usage, dtrace, tcpdump, and lldb
• Experience testing low-level products such as VPNs, endpoint security tools, or antivirus software
• Ability to read crash reports and debug logs and identify root causes
• Ability to work independently and investigate issues thoroughly before escalating
• Excellent written communication for clear test case documentation and bug reports
• Comfortable working in Terminal (launchctl, log, systemextensionsctl, tccutil)
• Able to set up and fully clean test environments (VMs/snapshots, removing extensions, resetting permissions)
• Availability to work during US Eastern Time (EST) business hours

• Compensation: Based on experience
• PTO and holidays