To prepare for an SDET role, focus on mastering programming languages such as Python, Java, or C#. Develop skills in Selenium, API testing, Jenkins, Git, and other relevant tools. These technologies will enable you to create automated test frameworks and collaborate efficiently as a Software Developer in Test.
If you are interested in getting into this field, then check out this video about how Deep grabbed a job as a Software Developer in Test just after completing the Selenium Certification Training Course from Intellipaat.