AWS cloud engineer is responsible for designing, building, and managing cloud-based applications and services using Amazon Web Services (AWS). This role encompasses various responsibilities including planning and designing cloud infrastructure, maintaining and deploying applications, troubleshooting and resolving issues, developing new cloud-based solutions, designing secure network solutions, creating virtualized systems in the AWS environment, performing infrastructure upgrades, deploying applications using EC2 instances and Elastic Beanstalk, creating blueprints using CloudFormation templates, maintaining and implementing disaster recovery procedures, implementing automation using scripting languages, and building tools for deployment, monitoring, and troubleshooting system resources.