Top 10 AWS Lambda interview questions and answers

Here are the top 10 AWS Lambda interview questions and answers to help you prepare for your next job interview. Learn about AWS Lambda’s serverless compute service, common use cases, supported languages, how to create and deploy a function, how to invoke a function, how to set up event triggers, how to use environment variables, how to troubleshoot issues, and how to optimize performance.

What is AWS Lambda?

AWS Lambda is a serverless compute service that runs your code in response to events and automatically manages the underlying compute resources for you.

How does AWS Lambda work?

AWS Lambda executes your code in response to specific events, such as an HTTP request from an Amazon API Gateway endpoint or an object being added to an Amazon S3 bucket. When an event occurs, Lambda allocates an execution environment to your function and executes your code.

What are some common use cases for AWS Lambda?

Some common use cases for AWS Lambda include running backend logic for mobile and web applications, processing data streams, responding to changes in data stores, and automating data pipelines.

What languages can I use with AWS Lambda?

AWS Lambda supports the following languages: Node.js, Java, C#, Go, PowerShell, Python, and Ruby.

How do I create and deploy a function on AWS Lambda?

To create and deploy a function on AWS Lambda, you can use the AWS Management Console, the AWS CLI, or the AWS Lambda API. You can also use tools like the AWS Serverless Application Model (SAM) or the AWS Cloud Development Kit (CDK) to create and deploy your functions.

How do I invoke a function on AWS Lambda?

You can invoke a function on AWS Lambda using the AWS Management Console, the AWS CLI, or the AWS Lambda API. You can also use other AWS services to invoke your function, such as Amazon API Gateway, Amazon S3, or Amazon SNS.

How do I set up event triggers for my function on AWS Lambda?

You can set up event triggers for your function by specifying an event source when you create or update your function. Some examples of event sources include Amazon S3 buckets, Amazon DynamoDB tables, and Amazon Kinesis data streams.

How do I set up and use environment variables in my function on AWS Lambda?

You can set up and use environment variables in your function by specifying them when you create or update your function. You can then access the environment variables in your code using the process.env object in Node.js or the System.Environment class in C#.

How do I troubleshoot issues with my function on AWS Lambda?

To troubleshoot issues with your function on AWS Lambda, you can use the AWS Management Console, the AWS CLI, or the AWS Lambda API to view your function’s logs, metrics, and traces. You can also use the AWS X-Ray service to debug and trace issues with your function.

How do I optimize the performance of my function on AWS Lambda?

To optimize the performance of your function on AWS Lambda, you can use techniques such as minimizing the number of external dependencies and network calls, minimizing the size of your deployment package, and optimizing your code for cold start performance. You can also consider using provisioned concurrency to improve the performance of your function.

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