Design Multicloud Publishing and API Gateway

Company: Illumio

Role: Software Engineer

Category: System Design

Difficulty: medium

Interview Round: Onsite

Quick Answer: This question evaluates understanding of distributed systems and cloud architecture, covering reliable database-to-multicloud event publishing (messaging, ordering, idempotence, retries, partitioning, recovery, and observability) and API gateway concerns (routing, authentication/authorization, rate limiting, validation, logging, and high availability). It is commonly asked to assess architectural thinking, trade-off analysis and failure-mode reasoning for systems that must scale and evolve, and it belongs to the System Design/distributed systems and cloud architecture domain while testing both practical application of architectural patterns and higher-level conceptual reasoning.