{{interview-qa-header="/hiring-docs/aws"}}

1. What experience do you have with AWS services such as EC2, S3, and Lambda?

I have extensive experience working with AWS services such as EC2, S3, and Lambda. For instance, I have used EC2 to deploy scalable web applications, S3 for storing and retrieving large amounts of data, and Lambda for building serverless applications that run on demand.

2. Can you explain the differences between Amazon RDS and Amazon DynamoDB?

Amazon RDS is a managed relational database service, while Amazon DynamoDB is a NoSQL database service. RDS is best suited for applications that require complex queries and transactions, while DynamoDB is ideal for applications that require high scalability and low latency.

3. What is your experience with AWS Identity and Access Management (IAM)?

I have a strong understanding of IAM and have used it extensively to manage access to AWS resources. For example, I have created IAM policies to grant or restrict access to specific resources and have configured IAM roles to enable temporary access for external users.

4. What is your experience with AWS Elastic Beanstalk?

I have experience using Elastic Beanstalk to deploy and manage scalable web applications. I have utilized its automatic capacity provisioning, load balancing, and application health monitoring features to ensure optimal performance.

5. How do you ensure data security and compliance when using AWS?

I follow AWS best practices to ensure data security and compliance. For instance, I encrypt sensitive data in transit and at rest, use AWS CloudTrail to track user activity, and follow industry-specific compliance regulations such as HIPAA and GDPR.

6. What is your experience with AWS CloudFormation?

I have experience using CloudFormation to automate the deployment of AWS resources. I have created CloudFormation templates to define the infrastructure and configuration needed for a particular application, which makes it easy to replicate environments consistently and reliably.

7. What is your experience with AWS Lambda?

I have extensive experience with AWS Lambda, which I have used to build serverless applications that run on demand. I have written functions in languages such as Python and Node.js, and have used them to trigger events in response to AWS services such as S3 and DynamoDB.

8. Can you explain the differences between Amazon SNS and Amazon SQS?

Amazon SNS is a messaging service that enables the broadcasting of messages to multiple recipients, while Amazon SQS is a queuing service that enables the decoupling of distributed systems. SNS is best suited for use cases that require push-based delivery, while SQS is ideal for use cases that require pull-based delivery.

9. What is your experience with AWS CloudWatch?

I have experience using CloudWatch to monitor AWS resources and applications. I have created custom metrics, alarms, and dashboards to monitor performance and have used CloudWatch Logs to analyze and troubleshoot application issues.

10. Can you explain the differences between AWS Elastic Block Store (EBS) and Instance Store?

AWS Elastic Block Store (EBS) is a block-level storage service that provides persistent storage for EC2 instances. At the same time, Instance Store is a temporary storage service that is physically attached to the EC2 instance. EBS is best suited for use cases that require long-term storage, while Instance Store is ideal for use cases that require high-performance temporary storage.

{{tech-qa-header="/hiring-docs/aws"}}

1. How would you configure an EC2 instance to automatically start a specific script on boot?

_Answer:

#!/bin/bash
yum update -y
yum install -y httpd
systemctl start httpd
systemctl enable httpd

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2. How would you upload a file to an S3 bucket using the AWS SDK for Python (Boto3)?

_Answer:

import boto3

s3 = boto3.client('s3')
with open("example.txt", "rb") as f:
    s3.upload_fileobj(f, "my-bucket", "example.txt")

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3. How would you create a Lambda function that responds to an S3 bucket upload event?

_Answer:

import boto3

def lambda_handler(event, context):
    s3 = boto3.client('s3')
    for record in event['Records']:
        bucket_name = record['s3']['bucket']['name']
        object_key = record['s3']['object']['key']
        response = s3.get_object(Bucket=bucket_name, Key=object_key)
        # process the object data here

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4. How would you create an Auto Scaling group that scales based on CPU utilization?

_Answer:

Resources:
  MyAutoScalingGroup:
    Type: AWS::AutoScaling::AutoScalingGroup
    Properties:
      LaunchConfigurationName: !Ref MyLaunchConfiguration
      MinSize: 1
      MaxSize: 10
      DesiredCapacity: 2
      AvailabilityZones:
        - us-east-1a
        - us-east-1b
      MetricsCollection:
        - Granularity: '1Minute'
          Metrics:
            - GroupName: AWS/EC2
              MetricName: CPUUtilization
      TargetGroupARNs:
        - !Ref MyTargetGroup

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5. How would you configure an ELB to terminate SSL/TLS connections and forward unencrypted traffic to EC2 instances?

_Answer:

aws elbv2 create-listener \
    --load-balancer-arn <load_balancer_arn> \
    --protocol HTTPS \
    --port 443 \
    --certificates CertificateArn=<ssl_certificate_arn> \
    --default-actions Type=forward,TargetGroupArn=<target_group_arn>

{{job-qa-header="/hiring-docs/aws"}}

Introduction

Creating an excellent job posting template is crucial for attracting the right candidates to your organization. In this guide, we will provide tips and examples for creating an effective AWS developer job posting template to help you find your team's best talent.

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Job Title

The job title is the first thing that candidates will see, so it's essential to make it clear and specific. Use a title that accurately reflects the position and highlights the critical skills and experience required for the role.

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<span class="guide_indent-text">Example:</span>

<ul><li>AWS Developer</li><li>Senior AWS Developer</li><li>AWS Solutions Architect</li></ul>

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Job Description

The job description should provide an overview of the position and the responsibilities involved. It should also highlight the required skills, experience, and qualifications. Use clear and concise language and avoid jargon or overly technical terms that candidates may not understand.

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<span class="guide_indent-text">Example:</span>

<ul><li>Develop and maintain AWS cloud-based applications and services</li><li>Collaborate with cross-functional teams to design, develop, and implement solutions</li><li>Create and maintain documentation, including design specifications, test plans, and user guides</li><li>Troubleshoot and resolve issues related to AWS infrastructure and services</li></ul>

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Key Responsibilities

The key responsibilities section should provide a detailed list of the tasks and duties that the candidate will be expected to perform. Be specific and highlight the critical tasks that are essential to the role.

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<span class="guide_indent-text">Example:</span>

<ul><li>Design, develop, and deploy AWS cloud-based applications and services</li><li>Collaborate with cross-functional teams to develop and implement solutions that meet business requirements</li><li>Monitor and maintain AWS infrastructure and services to ensure optimal performance and availability</li><li>Troubleshoot and resolve issues related to AWS infrastructure and services</li></ul>

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Requirements

The requirements section should outline the required skills, experience, and qualifications needed to perform the job. Be specific and list the must-have requirements that the candidate must meet.

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<span class="guide_indent-text">Example:</span>

<ul><li>Bachelor's degree in Computer Science, Information Technology, or related field</li><li>Minimum of 3 years of experience in developing and deploying AWS cloud-based applications and services</li><li>Strong programming skills in Python, Java, or other relevant languages</li><li>Experience with AWS services such as EC2, S3, Lambda, and CloudFormation</li></ul>

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Preferred Qualifications

The preferred qualifications section should outline additional skills, experience, or qualifications that would be beneficial for the role.

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<span class="guide_indent-text">Example:</span>

• AWS certification such as AWS Certified Solutions Architect or AWS Certified Developer
• Experience with DevOps tools and methodologies such as Jenkins, Git, and Docker
• Experience with serverless computing using AWS Lambda or similar services
• Strong problem-solving and analytical skills

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Benefits

The benefits section should provide information about the benefits package that the company offers. It can include health insurance, retirement plans, paid time off, or any other benefits. This section can help attract potential candidates who are looking for a comprehensive benefits package.

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<span class="guide_indent-text">Example:</span>

<ul><li>Competitive salary and comprehensive benefits package, including health, dental, and vision insurance</li><li>401k retirement plan with matching contributions</li><li>Generous paid time off and flexible work hours</li><li>Opportunities for professional development and career advancement</li></ul>

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How to Apply

The how to apply section should provide clear instructions on how candidates can apply for the position. Include information on the application process, such as submitting a resume and cover letter, and the application deadline.

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<span class="guide_indent-text">Example:</span>

<ul><li>To apply, please submit your resume and cover letter to [email address] by [deadline date]</li><li>We thank all candidates for their interest, but only those selected for an interview will be contacted.</li></ul>

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Conclusion

Creating an effective job posting template is essential for attracting the right candidates to your organization. Use the tips and examples in this guide to create a clear, concise, and compelling job posting that will help you find the best AWS developers for your team.

{{challenge-qa-header="/hiring-docs/aws"}}

Challenge Instructions:

Write a Lambda function that processes CSV files from an S3 bucket and saves the processed data to a DynamoDB table. The function should be triggered whenever a new file is uploaded to the S3 bucket. The CSV files contain the following columns: Name, Age, Email, and Phone. The function should validate the data and only save it to the DynamoDB table if it meets the following criteria:

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• Name must be a string and not empty
• Age must be a number between 18 and 100
• Email must be a valid email address
• Phone must be a string in the format XXX-XXX-XXXX

_Answer:

import csv
import json
import boto3
import re

s3_client = boto3.client('s3')
dynamodb = boto3.resource('dynamodb')
table = dynamodb.Table('my-table')

def lambda_handler(event, context):
    for record in event['Records']:
        bucket = record['s3']['bucket']['name']
        key = record['s3']['object']['key']
        try:
            obj = s3_client.get_object(Bucket=bucket, Key=key)
            body = obj['Body']
            csv_string = body.read().decode('utf-8')
            reader = csv.DictReader(csv_string.split('\n'), delimiter=',')
            for row in reader:
                if not is_valid(row):
                    continue
                table.put_item(Item=row)
        except Exception as e:
            print(e)
            continue

def is_valid(row):
    name = row.get('Name', '').strip()
    age = row.get('Age', '').strip()
    email = row.get('Email', '').strip()
    phone = row.get('Phone', '').strip()
    if not name:
        return False
    if not re.match('^[0-9]{1,3}$', age):
        return False
    age = int(age)
    if age < 18 or age > 100:
        return False
    if not re.match(r"[^@]+@[^@]+\.[^@]+", email):
        return False
    if not re.match(r"^\d{3}-\d{3}-\d{4}$", phone):
        return False
    return True

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As the demand for cloud computing services continues to grow, the need for skilled AWS developers will only increase. Hiring the right candidate for an AWS developer role is crucial for building a successful cloud infrastructure team. We hope this guide has given you the resources you need to hire or land your dream job as an AWS developer. Using the interview questions, job posting template, and coding challenge provided in this guide, you can feel confident that you're making informed decisions about your next hire or career move. Good luck on your journey to becoming an AWS expert!