SAA-C03 Q708 · Serverless

Question

A company is building a serverless application to process ecommerce orders. The application must handle bursts of traffic and process orders asynchronously in the order received. Which solution will meet these requirements?

Accepted Answer

**Answer B: Amazon SQS FIFO with AWS Lambda** satisfies every requirement:

1. **Serverless**: Both SQS and Lambda are fully managed, serverless services — no servers to provision or manage.

2. **Handle bursts of traffic**: SQS acts as a **buffer** between the order producers and the processing logic. During traffic bursts, messages queue up in SQS, and Lambda scales up consumers to process them. This decoupling prevents overload.

3. **Process orders asynchronously**: SQS is fundamentally an asynchronous messaging service. Producers send messages to the queue and immediately return — they don't wait for processing to complete.

4. **In the order received (strict ordering)**: This is the critical requirement. **SQS FIFO (First-In-First-Out)** guarantees that messages are delivered and pro

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