Amazon - Frontend Engineer II - Phone Interview

Interview Experience
1

Title:
Amazon - Frontend Engineer II - Phone Interview

Description:
Level: Frontend Engineer II
Education: Master’s
Years of Experience (YOE): 5
Questions Asked:
Implement Pub/Sub System in JavaScript:

  • Design a publish-subscribe system with the ability to subscribe(eventName, callback), unsubscribe(eventName, callback), and publish(eventName, data).
  • Emphasis was on clean OOP structure, and efficient solution.
  • Bonus discussion on edge cases (e.g., duplicate subscribers, unsubscribing during execution).

Outcome:
The solution passed all edge cases and led to a positive result — moving to the next round (onsite)!
Grateful for the opportunity and looking forward to what’s next.