AWS Serverless Services Interview Questions

AWS interview questions specifically focused on AWS Lambda, API Gateway, Step Functions, and SQS (Simple Queue Service):

AWS Lambda

1. What is AWS Lambda, and how does it work?
2. How do you configure the memory and timeout settings for a Lambda function?
3. What are the various triggers that can invoke a Lambda function?
4. How does AWS Lambda scale in response to high loads?
5. What is a cold start in AWS Lambda, and how can it affect performance?
6. How do you handle logging and monitoring for Lambda functions?
7. What are Lambda execution roles, and how do they work with AWS IAM?
8. What are Lambda Layers, and how can they be used to manage dependencies?
9. Explain how you can version and alias Lambda functions.
10. How do you manage environment variables securely in AWS Lambda?
11. What are the limits for AWS Lambda (e.g., function size, execution duration)?
12. Explain how you can use Lambda to interact with other AWS services like S3, DynamoDB, etc.
13. How do you handle exceptions and retries in AWS Lambda?
14. What is the AWS Lambda lifecycle, and how does it affect state management?
15. What is AWS Lambda provisioned concurrency, and how does it improve performance?

API Gateway

1. What is Amazon API Gateway, and how does it work with AWS Lambda?
2. What are the main features of API Gateway, and how does it support building RESTful APIs?
3. How do you secure API Gateway endpoints?
4. What are the different types of integrations in API Gateway (e.g., Lambda proxy integration)?
5. Explain how you would create and deploy a REST API using API Gateway and Lambda.
6. What are the different stages in API Gateway, and how do you manage them?
7. How do you implement request validation and transformation in API Gateway?
8. Explain the difference between edge-optimized, regional, and private API endpoints in API Gateway.
9. How does throttling and rate-limiting work in API Gateway?
10. What are API Gateway usage plans and API keys? How do they help manage access to APIs?
11. How can you handle cross-origin resource sharing (CORS) in API Gateway?
12. What is the purpose of mapping templates in API Gateway, and how are they used?
13. How do you configure custom domain names for an API Gateway API?
14. What is the difference between REST API and HTTP API in API Gateway?
15. How do you use API Gateway caching, and how does it impact performance?

AWS Step Functions

1. What are AWS Step Functions, and how do they work?
2. Explain the use case for AWS Step Functions and how they can be used to orchestrate Lambda functions.
3. What is a state machine in AWS Step Functions, and how does it work?
4. What are the different types of state machine execution in Step Functions (Standard vs. Express)?
5. How do you define a Step Functions workflow using Amazon States Language (ASL)?
6. How do you handle error handling and retries in Step Functions?
7. What are the different state types in Step Functions (e.g., Task, Wait, Parallel, Choice)?
8. How do you pass input and output between states in a Step Functions workflow?
9. Explain how Step Functions integrate with services other than Lambda (e.g., DynamoDB, SQS, SNS).
10. What are the benefits of using Step Functions for long-running workflows?
11. How do you manage timeouts and concurrency in AWS Step Functions?
12. What are the costs associated with using AWS Step Functions?
13. How do you implement a retry strategy in Step Functions?
14. Explain how Step Functions handle state transitions and task failures.
15. What are some best practices for designing workflows with Step Functions?

Amazon SQS (Simple Queue Service)

1. What is Amazon SQS, and how does it work?
2. What are the differences between Standard and FIFO queues in SQS?
3. How do you use Amazon SQS to decouple microservices?
4. What is the maximum message size in SQS, and how can you handle larger messages?
5. Explain how message visibility timeout works in SQS.
6. How do you ensure at-least-once message delivery in SQS?
7. What is the dead-letter queue (DLQ) in SQS, and how is it used?
8. How does long polling work in SQS, and how does it reduce cost?
9. How can you secure messages in SQS using server-side encryption?
10. What is the retention period for messages in SQS, and how can it be configured?
11. How does SQS handle message ordering in FIFO queues?
12. What is the role of SQS in event-driven architectures, and how can it be integrated with Lambda?
13. Explain how the delay queue feature works in SQS.
14. What are the limits of Amazon SQS (e.g., message size, throughput)?
15. How do you integrate SQS with other AWS services like Lambda, SNS, or Step Functions?
16. How can you handle concurrency issues in SQS when multiple consumers are reading from the same queue?
17. What is the purpose of the ReceiveMessageWaitTimeSeconds parameter in SQS?
18. How does Amazon SQS guarantee message durability and availability?
19. How do you monitor and log activities in SQS queues?
20. What are some best practices for optimizing the performance and cost of SQS?

These questions cover a range of topics related to Lambda, API Gateway, Step Functions, and SQS, which are key components in serverless architectures and event-driven applications in AWS.

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