In which types of testing have you achieved the greatest results or participated with particular success?

The greatest results I achieved in functional (including functional) testing and regression testing.

Functional testing allows verifying that all application functions work according to requirements. It is important to carefully develop test cases covering the main usage scenarios.

Regression testing helps ensure that changes did not break existing functionality. It is especially effective when automating tests, allowing quick execution of checks after each update.

I also participated in integration testing, where I checked the interaction between modules and external services, which helped identify errors at component interfaces.

An example of successful application is the automation of regression tests using Selenium, which significantly reduced testing time after releases and increased product stability.