Node.js + TypeScript Interview Kit

Prepare for Node.js and TypeScript interviews with a focused kit built for the night before not a semester-long course.

This kit covers 50 questions across internals, TypeScript, APIs, coding rounds, and system design. Each question is written the way interviewers actually ask it, with a short answer, what they’re really testing, the mistake candidates commonly make, and a follow-up.

What’s inside

1. 15 Node.js internals questions: event loop, async scheduling, streams, workers, cluster, memory leaks, and performance
2. 10 TypeScript questions: generics, narrowing, utility types, type guards, and the type-system questions that come after “do you know TS syntax”
3. 10 API & authentication questions: REST, status codes, JWT, CORS, rate limiting, and password hashing
4. 5 practical coding challenges: concurrency limiter, retry with backoff, rate limiter, streams, and an in-memory cache (with hints and follow-ups)
5. 10 system design scenarios: URL shortener, notifications, auth, chat, file uploads, job queues, and more
6. 10 ways to sound stronger in interviews: trade-offs, failure cases, scale, and how you talk through your thinking
7. Final interview checklist: a 1-page recap for the morning of

How to use it

Work through Sections 1–3 for rapid-fire technical rounds, Section 4 if coding is part of your interview, and Section 5 if you have a system-design round. Use the checklist as a final scan the morning of.

Who it’s for

Backend and full-stack engineers interviewing for Node.js / TypeScript roles who want practical answers, not textbook definitions.

Created by Sanduni Pavithra, Full-Stack Software Engineer.