Pub/Sub and Package Notification System (OOD)

Problem Overview

An OOD round on publish/subscribe, reported in two shapes: - Package notifications (phone screen): when a package's status updates, notify the customer; customers can subscribe to a package's status. After the code the interviewer asked where the data should be stored and what type of database, then what to do…

• 2 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
• The rest of the problem statement — full requirements, constraints, and edge cases
• Approach and trade-offs — what passing candidates did, and the mistakes that sink people