Node.js Mastery Pack

V8 internals, Libuv threadpool, event loop phases, stream backpressure, and worker pools.

The definitive preparation track for Node.js backend engineers. Covers all 20 curated Node.js questions in our library, both Free and Staff quizzes, and real-world failure modes like Libuv thread starvation and stream OOM crashes.

Target AudienceNode.js and TypeScript backend engineers preparing for runtime and concurrency rounds.

Targeted Companies

UberNetflixPayPalLinkedInWalmart

2-3 WeeksPlan Duration

2Curriculum Modules

20Curated Questions

4Milestones

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Structured Syllabus

Curriculum Modules (Preview Mode)

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Runtime Architecture, Event Loop & Microtasks

Free Preview

V8, Libuv, process.nextTick(), queueMicrotask(), and timers.

~6h

Target Competency & Objective:Understand the core architecture of Node.js and predict exact asynchronous code execution order under pressure.

Core Technical Concepts Tested

V8 Engine vs Libuv C library responsibilitiesThe 6 phases of the Libuv event loop: Timers, Pending, Idle/Prepare, Poll, Check, Closeprocess.nextTick() priority over queueMicrotask() and PromisessetImmediate() (Check phase) vs setTimeout(fn, 0) (Timers phase)

What Fails in Production (Triage Scenarios):

Recursive process.nextTick() completely starving the event loop from servicing network I/O
Timer drift: setTimeout(fn, 10) firing after 500ms due to poll phase blocking
Synchronous CPU calculation locking the single main thread