I went straight to message queues and talked through producers and consumers, but I think I spent too long on the happy path and barely touched failure modes.
Start by clarifying the requirements and constraints, then propose a high-level architecture using a message queue or event bus for asynchronous communication. Discuss trade-offs between different technologies and explain how you would measure success and handle failures.
Pro tip: Emphasize decoupling and scalability, but also highlight operational considerations like monitoring, dead-letter queues, and idempotency to show production readiness.
Ask questions to understand the use case, expected load, latency requirements, and reliability needs. This ensures your design meets the actual business needs.
Propose a decoupled architecture with producers, a message broker (e.g., SQS, Kafka), and consumers. Explain how components interact asynchronously.
Compare options like SQS vs. SNS vs. Kafka, discussing factors like durability, ordering, throughput, and cost. Justify your recommendation.
Describe how to handle failures (retries, dead-letter queues), ensure idempotency, and scale producers and consumers independently.
Outline key metrics (e.g., queue depth, processing latency, error rates) and how you would monitor and alert on them to ensure system health.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.