AWS Lambda and Serverless Questions: Developer Associate Deep Dive

What is this page about?

A serverless-focused deep dive for the AWS Developer Associate (DVA-C02) exam, where roughly 32% of questions touch Lambda, API Gateway, DynamoDB, Step Functions, EventBridge, or SQS, worded densely around concurrency, IAM execution roles, and event-source mapping. It works through the highest-yield topics, Lambda concurrency, idempotency and retry logic, event source mapping, API Gateway integration and authorizers, deployment/versioning/aliases, and execution roles versus resource policies, plus a serverless-specific study plan and the common traps that cost points.

What has been corrected on this page?

Every accepted correction to this page is recorded with the exact change, so readers can see how the page improved over time.

1. 11 July 2026 · corrected by Melik Can Sariyer

   5 flagged claims verified. (1) '10 trillion invocations/month by 2024' CONFIRMED ACCURATE via search -- matches AWS-disclosed figures closely. Left unchanged. (2) Named-companies Lambda usage claim, including a suspiciously specific 'iRobot Roomba fleet' detail, had no findable source -- softened to general enterprise framing. (3) iRobot-specific authorizer-caching claim -- unverified, softened to a general pattern statement. (4) Capital One 'publicly documented in open-source idempotency libraries' -- no findable source, generalized. (5) Tim Wagner's real title/role (original Lambda GM, Vendia founder) CONFIRMED via search, but the specific claim attributed to him is unverifiable -- de-attributed while keeping his real background out of the false-quote framing. Also found and fixed a second unverified Werner Vogels quote not in the original flag list, same pattern as elsewhere in this corpus.

   Before

   Unverified Werner Vogels quote about Lambda being AWS default compute. Unsourced named-companies Lambda usage claim including a suspiciously specific iRobot Roomba fleet detail. Unverified iRobot-specific authorizer-caching claim. Capital One idempotency claim attributed to an unverified source ("publicly documented in open-source idempotency libraries"). Tim Wagner quote about VPC-attached Lambda misconfigurations, unverifiable despite his real title/background.

   After

   De-attributed the Werner Vogels quote to plain prose. Softened the named-companies Lambda usage claim (Netflix/Capital One/Coca-Cola/iRobot) to a general enterprise framing. Generalized the iRobot-specific authorizer-caching claim to a general statement about high-throughput IoT/telemetry pipelines. Generalized the Capital One idempotency claim to reference the pattern as widely documented in open-source idempotency libraries generally, without the unverified specific-source attribution. De-attributed the Tim Wagner quote about VPC-attached Lambda misconfigurations to plain prose. Verified and kept the accurate 10 trillion invocations/month by 2024 statistic unchanged.

   Why: Applied fact-check fix: de-attributed 2 unverified quotes (Vogels, Wagner), generalized 3 unverifiable named-company/specific-source claims, kept the verified accurate Lambda invocation statistic.

   View the full record →

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