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Senior QA Engineer - Windows Internals at Sur. Our client is looking for a highly technical QA Engineer with deep expertise in Windows internals, networking, and application compatibility testing. You will be responsible for validating low-level functionality such as drivers, hooks, and system APIs across our Windows Secure Enclave platform. This is not a checkbox QA role — you’ll be reverse-engineering app behaviors, designing compatibility matrices, and creating regression suites that validate complex interactions between Windows components, 3rd party software, and integrations into the Windows ecosystem.. This role sits within a deeply technical team building endpoint security and system-level compatibility software for unmanaged or BYOD endpoints. You’ll work side-by-side with developers who write kernel-mode and user-mode code.. About the role:. . Design and execute test strategies for low-level Windows functionality: file system filters, network stack integrations, kernel/user hooks, etc.. . Test application compatibility for hundreds of real-world desktop applications in containerized/sandboxed environments.. . Build and maintain robust manual and automated regression test suites.. . Investigate complex system interactions, using tools like Process Monitor, WinDbg, ETW, and Sysinternals.. . File, isolate, and document hard-to-reproduce defects with deep system context.. . Collaborate with developers and product managers to understand technical requirements and corner cases.. . Develop automation tools and scripts (Python, PowerShell, C#) to streamline regression and compatibility testing.. . . 5+ years of Windows QA or SDET experience, with a focus on drivers, internals, or endpoint security products.. . Deep understanding of Windows OS internals (e.g., kernel/user-mode transitions, ALPC, WFP, NDIS, minifilters, etc.).. . Proven experience testing file systems, registry behavior, networking stacks, service lifecycles, and Group Policy interactions.. . Comfort working with debuggers, profilers, and diagnostic tools.. . Strong experience validating application behavior in controlled/sandboxed environments.. . Familiarity with compatibility testing of major enterprise apps (MS Office, Zoom, Teams, Citrix, VPNs, etc.).. . Scripting and automation experience in Python, PowerShell, or C#.. . Strong communication skills and meticulous bug reporting practices.. . Company Location: Argentina.