A production-ready SQS engineer understands standard and FIFO queue mechanics, dead-letter queue design, and consumer scaling strategies. They should be fluent in at least one runtime — Node.js, Python, Java, or Go — and know how to wire SQS to Lambda, ECS, or Step Functions.

Amazon SQS works well as the foundation for background job processors, event-driven microservice architectures, data ingestion pipelines, order queues, and notification dispatch systems. FIFO queues add strict ordering and exactly-once processing for financial and compliance use cases.

SQS is a pull-based queue — consumers poll for messages at their own pace, with persistence until delivery is confirmed. SNS pushes one event to multiple subscribers simultaneously without retention. Most production architectures combine both: SNS fans an event out to multiple SQS queues, each feeding an independent consumer.