Adaptive skill practice — find your level, get sharper.
Operating Systems practice
Processes, memory, and the kernel boundary
How the operating system works (Unix/Linux flavor) — processes and the fork/exec model, virtual memory and paging, CPU scheduling, system calls and the user/kernel boundary, signals and IPC, file descriptors and "everything is a file", inodes and links, and the permission model (rwx, octal, setuid/sticky). Evergreen OS mechanisms that systems interviews probe. Part of the Developer track.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
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