AWS DVA-C03 Sample Questions & Practice Test Update

AWS has not published a formal public DVA-C03 exam guide on the official AWS exam-guide or coming-soon pages reviewed for this site. Use the current AWS DVA-C02 Developer Associate page for current official preparation, and use this DVA-C03 page only to follow successor-code updates.

What this page is for

This page is an early update-watch page for developers who are tracking a possible DVA-C03 refresh. The sample questions below are original IT Mastery 2027-oriented planning scenarios based on the current Developer Associate role, current AWS developer tooling, and common application-delivery shifts. They are not official AWS questions and are not based on a published DVA-C03 blueprint.

Planning estimates, not official blueprint claims

If AWS refreshes the Developer Associate exam, likely areas to watch include serverless reliability, identity-aware APIs, event-driven workflows, CI/CD safety, observability, data access, infrastructure as code, and responsible use of AI services in applications.

Sample Exam Questions

Try these 12 original AWS DVA-C03 2027 planning questions. They are designed for self-assessment and update tracking, not as official exam material.

Question 1

What this tests: idempotent event processing

A Lambda function processes order-created events from SQS. A retry can occur after a transient timeout, but the order must not be charged twice. Which implementation is the best fit?

• A. Delete the SQS message before the payment call begins
• B. Add an idempotency key and store processed order state with a conditional write
• C. Disable all retries so the function runs only once
• D. Increase Lambda memory until duplicate events disappear

Best answer: B

Explanation: Event-driven systems must assume retries and occasional duplicate delivery. An idempotency key plus conditional persistence prevents duplicate side effects. Deleting early can lose work, disabling retries loses resilience, and memory tuning does not solve semantic duplication.

Question 2

What this tests: API authorization

A single-page application signs users in with Amazon Cognito user pools. The backend API runs on API Gateway and Lambda. Each request must verify the user’s identity before Lambda runs. What should the developer configure?

• A. A Cognito authorizer on API Gateway
• B. A public Lambda function URL with no authentication
• C. An API key as the only user-authentication mechanism
• D. A security group rule that allows all browser IP addresses

Best answer: A

Explanation: A Cognito authorizer lets API Gateway validate identity tokens before invoking Lambda. API keys are not user authentication. Public unauthenticated function URLs and broad network rules do not enforce per-user identity.

Question 3

What this tests: secret rotation

A containerized application on ECS needs database credentials that rotate automatically. Which approach is safest?

• A. Store the password in the container image and rebuild weekly
• B. Put the password in source control and restrict repository access
• C. Use AWS Secrets Manager and grant the ECS task role access only to the required secret
• D. Give every task AdministratorAccess so credentials can be fetched later

Best answer: C

Explanation: Secrets Manager supports managed secret storage and rotation. The ECS task role should have least-privilege access to the specific secret. Images, source control, and broad permissions create avoidable exposure.

Question 4

What this tests: Step Functions workflow fit

A document-processing app must run OCR, classify the result, call a human-review step only for uncertain documents, then notify downstream systems. Which service best coordinates this workflow?

• A. Amazon CloudFront
• B. AWS Step Functions
• C. Amazon Route 53
• D. AWS Certificate Manager

Best answer: B

Explanation: Step Functions is designed to coordinate multi-step workflows with branching, retries, service integrations, and human-review patterns. CloudFront, Route 53, and ACM solve delivery, DNS, and certificate concerns, not workflow orchestration.

Question 5

What this tests: deployment safety

A team deploys Lambda changes several times per day. They want 10% of traffic to use the new version first, automatic rollback on error alarms, and no manual routing edits. What should they use?

• A. AWS CodeDeploy with Lambda aliases and canary deployment settings
• B. A manual DNS change after each deployment
• C. A cron job that copies code into the running function
• D. A larger reserved concurrency value

Best answer: A

Explanation: CodeDeploy can shift traffic between Lambda versions through aliases and roll back based on alarms. DNS edits, code-copy jobs, and concurrency settings do not provide controlled Lambda release progression.

Question 6

What this tests: DynamoDB concurrency

Two users can reserve the last available seat for an event at nearly the same time. The app must allow only one successful reservation. Which DynamoDB feature should the developer use?

• A. A Scan before every write
• B. Eventually consistent reads
• C. A larger read capacity setting only
• D. A conditional write that checks the current available seat count

Best answer: D

Explanation: Conditional writes let DynamoDB update only when the required condition is true, preventing conflicting concurrent reservations. Reads alone can race. Capacity changes do not enforce business-state correctness.

Question 7

What this tests: observability for distributed apps

A serverless API sometimes takes four seconds instead of 300 milliseconds. Metrics show higher duration, but the team needs to know whether Lambda, DynamoDB, or an external call is the slow segment. What should be added?

• A. AWS X-Ray tracing and structured correlation identifiers
• B. S3 static website hosting
• C. A larger API Gateway request payload limit
• D. An IAM password policy change

Best answer: A

Explanation: Distributed tracing and correlation identifiers help isolate latency across service boundaries. Static hosting, payload limits, and password policies do not explain request-path latency.

Question 8

What this tests: Bedrock application guardrails

A developer adds a GenAI summarization feature for support tickets. The application must avoid sending unrelated customer data to the model and should keep prompts auditable. Which practice is most appropriate?

• A. Send the full customer database with every prompt for maximum context
• B. Use scoped retrieval, redact unnecessary fields, log prompt metadata safely, and enforce model-access permissions
• C. Let browser clients call the model directly with unrestricted credentials
• D. Disable all logging so no prompt can be audited

Best answer: B

Explanation: AI application features need scoped context, data minimization, access control, and safe auditability. Sending excessive data, exposing credentials, or removing audit trails weakens security and governance.

Question 9

What this tests: infrastructure as code

A team wants repeatable application environments for development, staging, and production. They need code review for infrastructure changes and consistent deployments. Which approach best fits?

• A. Manual console changes documented in a spreadsheet
• B. Shared administrator credentials for all developers
• C. Infrastructure as code with CDK or CloudFormation reviewed through the delivery pipeline
• D. Copying resources between accounts by hand

Best answer: C

Explanation: Infrastructure as code makes environments reviewable, repeatable, and auditable. Manual console changes and shared credentials introduce drift and security risk. Hand-copying resources does not scale.

Question 10

What this tests: SQS visibility timeout

A Lambda event source mapping reads messages from SQS. Long-running messages sometimes become visible again before processing finishes. What should the developer adjust first?

• A. The API Gateway stage name
• B. The S3 bucket lifecycle policy
• C. The Route 53 hosted zone TTL
• D. The SQS visibility timeout relative to maximum processing time

Best answer: D

Explanation: A message can be delivered again if processing exceeds the visibility timeout. The timeout should cover expected processing time, and the handler should remain idempotent. The other settings are unrelated to SQS message redelivery.

Question 11

What this tests: secure file upload

A web app lets authenticated users upload large files to S3. The files should not pass through the application server, and users should not receive AWS credentials. What should the backend generate?

• A. Long-lived IAM access keys embedded in JavaScript
• B. Short-lived presigned URLs scoped to the allowed upload operation
• C. A public bucket policy for all users
• D. A manual upload instruction asking users to email files

Best answer: B

Explanation: Presigned URLs allow time-limited, scoped S3 operations without exposing AWS credentials to clients. Embedded keys and public buckets are unsafe. Emailing files is not a scalable application workflow.

Question 12

What this tests: event routing

Several services publish events about customer activity. Only the loyalty service should receive events where purchaseAmount is above a threshold and region is eligible. Which AWS service is most appropriate for attribute-based routing?

• A. Amazon EBS
• B. AWS CloudTrail Lake
• C. Amazon EventBridge
• D. AWS Certificate Manager

Best answer: C

Explanation: EventBridge rules can route events based on event patterns and attributes. EBS, CloudTrail Lake, and ACM are not event-routing services for application workflows.

What to watch next

• AWS official publication of a DVA-C03 exam guide, beta page, or coming-soon notice
• retirement notes for DVA-C02, if AWS posts them
• changes to item count, duration, passing score, and domain weights
• whether AWS expands developer scope around AI-assisted application features, deployment safety, or observability

Official AWS sources

• AWS Certification exam guide list
• AWS Certification coming soon page
• Current DVA-C02 page on Mastery Exam Prep