AWS Developer Associate (DVA-C02) Certification Guide

The AWS Certified Developer Associate certification validates your ability to develop, deploy, and debug cloud-based applications using AWS.

Who Should Get This Certification?

• Software developers working with AWS
• DevOps engineers building CI/CD pipelines
• Backend developers creating serverless applications
• Full-stack developers using AWS services

Exam Overview

Aspect	Details
Exam Code	DVA-C02
Duration	130 minutes
Questions	65 questions
Passing Score	720/1000
Format	Multiple choice, multiple response
Cost	$150 USD

Exam Domains

Domain 1: Development with AWS Services (32%)

• Develop code for applications hosted on AWS
• Develop code for AWS Lambda
• Use data stores in application development

Domain 2: Security (26%)

• Implement authentication and authorization
• Implement encryption using AWS services
• Manage sensitive data in application code

Domain 3: Deployment (24%)

• Prepare application artifacts for deployment
• Test applications in development environments
• Automate deployment testing

Domain 4: Troubleshooting and Optimization (18%)

• Assist in root cause analysis
• Instrument code for observability
• Optimize applications using AWS services

Key Development Services

AWS Lambda

import json
import boto3

def lambda_handler(event, context):
    # Parse incoming event
    body = json.loads(event['body'])

    # Process data
    dynamodb = boto3.resource('dynamodb')
    table = dynamodb.Table('MyTable')

    response = table.put_item(
        Item={
            'id': body['id'],
            'data': body['data'],
            'timestamp': context.aws_request_id
        }
    )

    return {
        'statusCode': 200,
        'headers': {
            'Content-Type': 'application/json'
        },
        'body': json.dumps({
            'message': 'Success',
            'requestId': context.aws_request_id
        })
    }

Amazon DynamoDB Operations

const AWS = require('aws-sdk');
const dynamodb = new AWS.DynamoDB.DocumentClient();

// Put Item
async function createItem(item) {
    const params = {
        TableName: 'Products',
        Item: item,
        ConditionExpression: 'attribute_not_exists(pk)'
    };
    return dynamodb.put(params).promise();
}

// Query Items
async function queryItems(category) {
    const params = {
        TableName: 'Products',
        KeyConditionExpression: 'category = :cat',
        ExpressionAttributeValues: {
            ':cat': category
        }
    };
    return dynamodb.query(params).promise();
}

// Update Item
async function updateItem(id, updates) {
    const params = {
        TableName: 'Products',
        Key: { id },
        UpdateExpression: 'SET #name = :name, price = :price',
        ExpressionAttributeNames: {
            '#name': 'name'
        },
        ExpressionAttributeValues: {
            ':name': updates.name,
            ':price': updates.price
        },
        ReturnValues: 'ALL_NEW'
    };
    return dynamodb.update(params).promise();
}

API Gateway Integration

# SAM Template
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Resources:
  MyApi:
    Type: AWS::Serverless::Api
    Properties:
      StageName: prod
      Auth:
        DefaultAuthorizer: MyCognitoAuthorizer
        Authorizers:
          MyCognitoAuthorizer:
            UserPoolArn: !GetAtt MyUserPool.Arn

  MyFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: index.handler
      Runtime: nodejs18.x
      Events:
        GetItems:
          Type: Api
          Properties:
            RestApiId: !Ref MyApi
            Path: /items
            Method: GET

CI/CD with AWS

CodePipeline Structure

Source (CodeCommit/GitHub)
    │
    ▼
Build (CodeBuild)
    │
    ▼
Test (CodeBuild)
    │
    ▼
Deploy (CodeDeploy/CloudFormation)
    │
    ▼
Production

buildspec.yml Example

version: 0.2

phases:
  install:
    runtime-versions:
      nodejs: 18
    commands:
      - npm install

  pre_build:
    commands:
      - npm run lint
      - npm run test

  build:
    commands:
      - npm run build
      - aws cloudformation package --template-file template.yaml --s3-bucket my-bucket --output-template-file packaged.yaml

artifacts:
  files:
    - packaged.yaml
    - '**/*'

cache:
  paths:
    - node_modules/**/*

Security Best Practices

Secrets Management

import boto3
import json

def get_secret(secret_name):
    client = boto3.client('secretsmanager')

    response = client.get_secret_value(
        SecretId=secret_name
    )

    if 'SecretString' in response:
        return json.loads(response['SecretString'])
    return None

# Usage
db_credentials = get_secret('prod/database/credentials')

IAM Policy for Lambda

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "dynamodb:GetItem",
                "dynamodb:PutItem",
                "dynamodb:Query"
            ],
            "Resource": "arn:aws:dynamodb:*:*:table/MyTable"
        },
        {
            "Effect": "Allow",
            "Action": [
                "logs:CreateLogGroup",
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": "*"
        }
    ]
}

Debugging and Monitoring

X-Ray Integration

from aws_xray_sdk.core import xray_recorder
from aws_xray_sdk.core import patch_all

patch_all()

@xray_recorder.capture('process_order')
def process_order(order_id):
    # Add annotation for filtering
    xray_recorder.put_annotation('order_id', order_id)

    # Add metadata for debugging
    xray_recorder.put_metadata('order_details', {
        'items': 5,
        'total': 99.99
    })

    # Your processing logic
    return process(order_id)

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Conclusion

The AWS Developer Associate certification proves your ability to build and maintain applications on AWS. Focus on hands-on coding, understand the services deeply, and practice with realistic exam questions to succeed.