What is the main task of a tester in the software development process?

The main task of a tester in the development process is to identify defects and ensure the quality of the software product. The tester analyzes requirements, develops test cases, performs testing (manual or automated), documents found errors, and interacts with the development team to fix them.

Thus, the tester helps ensure that the product meets requirements, operates stably and without failures, which reduces risks during release.