Design an ads event reporting system
Company: Pinterest
Role: Software Engineer
Category: System Design
Difficulty: medium
Interview Round: Onsite
Overview: This question evaluates a candidate's ability to design scalable, reliable event ingestion and analytics systems, testing competencies in distributed data pipelines, stream and batch aggregation, storage partitioning, API/query design, and correctness concerns such as deduplication and handling late or out-of-order events.