The responsibilities of DevOps Engineer are:
Understand customer requirements.
Implement various testing, development, IT infra, automation tools, etc.
Setting up tools and required infra.
Define and set development, test, release, update, and support processes for DevOps operations.
Troubleshoot techniques, and fix the code, and many more.
If you wish to become a DevOps Engineer, check out the DevOps Training course from Intellipaat. Also, check out this YouTube video on DevOps Engineer skills.