Adaptive skill practice — find your level, get sharper.
Node.js practice
Master the runtime behind server-side JavaScript
How Node.js really works — the libuv event loop and its phases, microtasks vs timers (process.nextTick, setImmediate), non-blocking I/O and the thread pool, streams and buffers, CommonJS vs ES modules, async patterns and error handling, EventEmitter, worker_threads for CPU-bound work, and building/operating servers. Evergreen fundamentals (reference: Node 24 LTS) that senior backend interviews assume. 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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