{"id":7748,"date":"2025-08-22T06:28:31","date_gmt":"2025-08-22T06:28:31","guid":{"rendered":"https:\/\/www.hirist.tech\/blog\/?p=7748"},"modified":"2025-08-22T06:28:33","modified_gmt":"2025-08-22T06:28:33","slug":"top-20-aws-lambda-interview-questions-and-answers","status":"publish","type":"post","link":"https:\/\/www.hirist.tech\/blog\/top-20-aws-lambda-interview-questions-and-answers\/","title":{"rendered":"Top 20 AWS Lambda Interview Questions and Answers"},"content":{"rendered":"\n<p>AWS Lambda is a serverless computing service by Amazon Web Services. It was launched in 2014 and was created by Tim Wagner to help developers run code without managing servers.\u00a0With Lambda, you just write your function, and AWS runs it when needed. It is used in automation, real-time file processing, backend APIs, and more.\u00a0Many roles like cloud developer, DevOps engineer, and backend engineer need Lambda skills. If you are applying for one of these jobs, the interview often starts with Lambda. So, let\u2019s look at the most asked AWS Lambda interview questions and answers.\u00a0<\/p>\n\n\n\n<p><strong>Fun Fact:<\/strong> According to 6sense, over 34,296 companies around the world have started using AWS Lambda as a Platform-as-a-Service (PaaS) tool in 2025.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-aws-lambda-interview-questions-and-answers\/#AWS_Lambda_Interview_Questions_for_Freshers\" title=\"AWS Lambda Interview Questions for Freshers\u00a0\">AWS Lambda Interview Questions for Freshers\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-aws-lambda-interview-questions-and-answers\/#AWS_Lambda_Interview_Questions_for_Experienced\" title=\"AWS Lambda Interview Questions for Experienced\">AWS Lambda Interview Questions for Experienced<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-aws-lambda-interview-questions-and-answers\/#AWS_Lambda_Scenario_Based_Interview_Questions\" title=\"AWS Lambda Scenario Based Interview Questions\">AWS Lambda Scenario Based Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-aws-lambda-interview-questions-and-answers\/#AWS_Lambda_Function_Interview_Questions\" title=\"AWS Lambda Function Interview Questions\">AWS Lambda Function Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-aws-lambda-interview-questions-and-answers\/#How_to_Prepare_for_AWS_Lambda_Interview\" title=\"How to Prepare for AWS Lambda Interview?\">How to Prepare for AWS Lambda Interview?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-aws-lambda-interview-questions-and-answers\/#Wrapping_Up\" title=\"Wrapping Up\">Wrapping Up<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-aws-lambda-interview-questions-and-answers\/#FAQs\" title=\"FAQs\">FAQs<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AWS_Lambda_Interview_Questions_for_Freshers\"><\/span>AWS Lambda Interview Questions for Freshers\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are some common AWS Lambda interview questions and answers to help freshers understand the basics and get ready for their first cloud job.<\/p>\n\n\n\n<ol>\n<li><strong>What is AWS Lambda and how does it work?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>AWS Lambda is a serverless compute service. You write your code, upload it, and AWS runs it only when triggered. You don\u2019t manage servers. Lambda automatically handles scaling and billing based on the number of requests.<\/p>\n\n\n\n<ol start=\"2\">\n<li><strong>Which programming languages are supported by AWS Lambda?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>As of 2025, Lambda supports Python, Node.js, Java, C#, Go, Ruby, and PowerShell. You can also use custom runtimes or container images if needed.<\/p>\n\n\n\n<ol start=\"3\">\n<li><strong>What are the main components of an AWS Lambda function?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>There are three:<\/p>\n\n\n\n<ul>\n<li><strong>Event<\/strong> \u2013 the trigger data<\/li>\n\n\n\n<li><strong>Handler<\/strong> \u2013 the function code that runs<\/li>\n\n\n\n<li><strong>Context<\/strong> \u2013 metadata about the request and function environment<\/li>\n<\/ul>\n\n\n\n<ol start=\"4\">\n<li><strong>How do you create and deploy a simple Lambda function?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>I open the AWS Lambda console, choose a blueprint or create a function from scratch, write or upload my code, set the permissions, and configure a trigger. Then I test it. For bigger projects, I use the AWS CLI or SAM.<\/p>\n\n\n\n<ol start=\"5\">\n<li><strong>What are the common triggers or event sources for AWS Lambda?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Common triggers include API Gateway, S3 (file uploads), DynamoDB Streams, SQS queues, CloudWatch events, and EventBridge.<\/p>\n\n\n\n<ol start=\"6\">\n<li><strong>What is the default execution timeout in AWS Lambda, and can it be changed?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The default timeout is 3 seconds. Yes, it can be changed. The maximum allowed timeout is 15 minutes (900 seconds).<\/p>\n\n\n\n<p><strong>Note:<\/strong> Interview questions on AWS Lambda often include basic concepts, real use cases, function limits, and how it integrates with other AWS services.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AWS_Lambda_Interview_Questions_for_Experienced\"><\/span>AWS Lambda Interview Questions for Experienced<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Let&#8217;s go through some AWS Lambda interview questions and answers for experienced professionals.<\/p>\n\n\n\n<ol start=\"7\">\n<li><strong>How do you reduce cold starts in Lambda functions?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Use smaller deployment packages, pick faster runtimes like Node.js or Go, and enable provisioned concurrency for critical functions. You can also use SnapStart for Java-based Lambdas to preload the execution environment.<\/p>\n\n\n\n<ol start=\"8\">\n<li><strong>What are Lambda Layers, and how do you use them?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Lambda Layers are used to share code, libraries, or dependencies across multiple functions. Instead of bundling everything in each deployment, I put common code in a layer and attach it to my functions. It keeps things clean and saves time.<\/p>\n\n\n\n<ol start=\"9\">\n<li><strong>How do you monitor and debug AWS Lambda functions in production?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>I use CloudWatch Logs for error output and CloudWatch Metrics to track invocations, duration, and errors. For deeper traces, I enable AWS X-Ray. I also set alarms for high error rates or long durations.<\/p>\n\n\n\n<ol start=\"10\">\n<li><strong>How do you manage configuration changes across multiple Lambda environments?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>I use environment variables for most configs. For secrets or larger settings, I use AWS Systems Manager Parameter Store or Secrets Manager. I separate dev, staging, and prod configs clearly.<\/p>\n\n\n\n<ol start=\"11\">\n<li><strong>Can one Lambda function call another? What\u2019s the best practice for doing this?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Yes, a Lambda can call another using the AWS SDK. I follow the principle of decoupling and often use SQS or Step Functions instead, especially when reliability or retries matter.<\/p>\n\n\n\n<ol start=\"12\">\n<li><strong>What are some real-world use cases where you used Lambda with other AWS services like SQS, Kinesis, or API Gateway?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>I have used Lambda with API Gateway to build lightweight REST APIs. I have also used it with SQS for processing order queues and with Kinesis for streaming analytics in real time.<\/p>\n\n\n\n<pre class=\"wp-block-verse\"><strong>Also Read - <a href=\"https:\/\/www.hirist.tech\/blog\/top-100-aws-interview-questions-and-answers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Top 100+ AWS Interview Questions and Answers<\/a><\/strong><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AWS_Lambda_Scenario_Based_Interview_Questions\"><\/span>AWS Lambda Scenario Based Interview Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>These Lambda AWS interview questions are based on real scenarios to help you practice solving practical challenges you might face on the job.<\/p>\n\n\n\n<ol start=\"13\">\n<li><strong>How would you build a serverless REST API using Lambda and API Gateway?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>I create a Lambda function that handles the logic. Then, I use API Gateway to set up routes like GET or POST and link them to the function. I choose Lambda Proxy integration so the full request is passed in. After deploying the API, I test using tools like Postman.<\/p>\n\n\n\n<ol start=\"14\">\n<li><strong>A Lambda function is intermittently timing out. How would you troubleshoot this?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>First, I check CloudWatch Logs to see where the function is slowing down. I look at external calls, loops, or large payloads. I also check if timeouts are too short and increase them if needed. If the function interacts with other services, I test those latencies too.<\/p>\n\n\n\n<ol start=\"15\">\n<li><strong>How do you handle retries and failures when a Lambda processes messages from SQS?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>I set a redrive policy with a dead-letter queue (DLQ). If a message fails after the max tries, it moves to the DLQ. I also use try-catch blocks in my code and log failed items clearly for later checks.&nbsp;<\/p>\n\n\n\n<ol start=\"16\">\n<li><strong>How would you schedule a Lambda to run a cleanup task every night at midnight?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>I create a rule in EventBridge with a cron expression for midnight. Then I set the Lambda as the target. The function runs on schedule without manual triggers.<\/p>\n\n\n\n<pre class=\"wp-block-verse\"><strong>Also Read - <a href=\"https:\/\/www.hirist.tech\/blog\/top-20-rest-api-interview-questions-and-answers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Top 50+ REST API Interview Questions and Answers<\/a><\/strong><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AWS_Lambda_Function_Interview_Questions\"><\/span>AWS Lambda Function Interview Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are some Lambda function in AWS interview questions to help you understand how Lambda functions work.<\/p>\n\n\n\n<ol start=\"17\">\n<li><strong>What happens in the lifecycle of a Lambda function execution?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The first time a Lambda runs, AWS creates a new container. This is called a cold start. It loads the code, sets up the runtime, and runs the handler. For following requests, the same container may be reused (a warm start) until it times out or is replaced.<\/p>\n\n\n\n<ol start=\"18\">\n<li><strong>What is the difference between context object and event object in a Lambda function?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The event object carries data from the trigger (like S3, API Gateway, or SQS). It contains inputs for the function. The context object gives metadata about the function&#8217;s environment \u2013 like the function name, timeout, memory, and request ID.<\/p>\n\n\n\n<ol start=\"19\">\n<li><strong>How do you package and deploy Lambda functions with external dependencies?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>For Python, I create a folder, install dependencies with pip into it, zip the whole folder, and upload it. For Node.js, I use npm to install packages and zip the node_modules with the handler. I use the AWS CLI or SAM to deploy.<\/p>\n\n\n\n<ol start=\"20\">\n<li><strong>How do you securely access secrets or environment-specific values inside a Lambda function?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>I use AWS Secrets Manager or Parameter Store. The Lambda gets an execution role with permission to fetch them. I avoid hardcoding. Sometimes I use encrypted environment variables, but not for sensitive data.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Prepare_for_AWS_Lambda_Interview\"><\/span>How to Prepare for AWS Lambda Interview?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>AWS Lambda is widely used in cloud jobs across startups and large companies. So, here are some tips to help you prepare for interview:&nbsp;<\/p>\n\n\n\n<ul>\n<li>Understand how Lambda works with other AWS services like S3, API Gateway and SQS<\/li>\n\n\n\n<li>Practice writing and deploying real Lambda functions<\/li>\n\n\n\n<li>Learn how to debug using CloudWatch and X-Ray<\/li>\n\n\n\n<li>Know how to reduce cold starts and handle timeouts<\/li>\n\n\n\n<li>Read common interview questions and practice speaking your answers out loud<\/li>\n\n\n\n<li>Use AWS free tier to test your code<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Wrapping_Up\"><\/span>Wrapping Up<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>With these 20 AWS Lambda interview questions and answers, you now have a solid base to prepare confidently. Practice the scenarios, understand how Lambda works, and stay updated with new features.<\/p>\n\n\n\n<p>Ready to take the next step? Visit Hirist to find top <a href=\"https:\/\/www.hirist.tech\/k\/aws-lambda-jobs?ref=blog\" target=\"_blank\" rel=\"noreferrer noopener\">AWS Lambda jobs<\/a>, including roles that require AWS Lambda skills. Your next opportunity might be just a click away.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1755843466877\"><strong class=\"schema-faq-question\"><strong>What is the AWS Lambda interview process like?<\/strong><\/strong> <p class=\"schema-faq-answer\">It typically includes 2\u20133 technical rounds. Expect questions on Lambda concepts, cloud architecture, and real use cases. Some companies also include a hands-on coding round or system design interview.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1755843474576\"><strong class=\"schema-faq-question\"><strong>What are the common AWS serverless interview questions?\u00a0<\/strong><\/strong> <p class=\"schema-faq-answer\">Here are some common AWS serverless interview questions that go beyond just AWS Lambda:<br\/>What is the difference between serverless and traditional cloud computing models?<br\/>How do AWS Lambda, API Gateway, and DynamoDB work together in a serverless stack?<br\/>What is the role of Amazon EventBridge in serverless architectures?<br\/>How do you handle authentication in serverless applications?<br\/>What is cold start in serverless computing and how can it be minimized?<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1755843486024\"><strong class=\"schema-faq-question\"><strong>Are AWS Lambda questions tough?<\/strong><\/strong> <p class=\"schema-faq-answer\">They are not too tough if you know the basics well. Most questions test how Lambda works, its limitations, and how it integrates with other AWS services. Scenario-based questions are common in experienced roles.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1755843493273\"><strong class=\"schema-faq-question\"><strong>Is AWS Lambda stateless or stateful?<\/strong><\/strong> <p class=\"schema-faq-answer\">AWS Lambda is stateless. Each invocation is independent. You can store state externally in databases like DynamoDB or S3.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1755843502465\"><strong class=\"schema-faq-question\"><strong>What are the three components of AWS Lambda?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Event source<\/strong> \u2013 the trigger<br\/><strong>Function code (handler)<\/strong> \u2013 the logic<br\/><strong>Execution environment<\/strong> \u2013 runtime that runs the function<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1755843511970\"><strong class=\"schema-faq-question\"><strong>What is the IAM role of Lambda in AWS?<\/strong><\/strong> <p class=\"schema-faq-answer\">An IAM role defines what AWS services your Lambda function is allowed to access \u2013 like reading from S3 or writing to DynamoDB.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1755843521800\"><strong class=\"schema-faq-question\"><strong>What is the average AWS Lambda developer salary?<\/strong><\/strong> <p class=\"schema-faq-answer\">People who work with AWS Lambda earn an average salary of \u20b931.0 lakhs in India. According to AmbitionBox, AWS Developers in India with 1\u20136 years of experience earn between \u20b93 Lakhs to \u20b916.8 Lakhs per year. The average annual salary is around \u20b97 Lakhs.<\/p> <\/div> <\/div>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXforGErImNNGJyBoea4tb2u1hUl6am0oL_2ENk5x6Q-vQMo-NohxudjztAiM1NTZKysJGTgpj0y6CGZNHkReXZJBKTtajrgTxVHW1KauoFmORXPj3EtsC4NwAfk2xOuyBbD_kVqSHb0GF5VE6S4JQ?key=M8JnoGVJ7YV2ERamIE0YRg\" alt=\"\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>AWS Lambda is a serverless computing service by Amazon Web Services. It was launched in&hellip;<\/p>\n","protected":false},"author":1,"featured_media":7757,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,29,19],"tags":[32,34,33],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Top 20 AWS Lambda Interview Questions and Answers - Hirist Blog<\/title>\n<meta name=\"description\" content=\"Explore AWS Lambda interview questions on cold starts, performance tuning, access controls, event triggers, limitations, and best practices.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hirist.tech\/blog\/top-20-aws-lambda-interview-questions-and-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 20 AWS Lambda Interview Questions and Answers - 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