A QA engineer makes sure software works as intended before and after release, designing test strategies, writing automated tests and finding defects. QA means quality assurance, and teams often hire one when escaped bugs start reaching customers.
Quality assurance (QA) is the set of practices that make sure software meets requirements and works reliably for users. It covers how quality is built into the process as well as how products are tested before release.
Test automation is the use of software to run tests, compare results with expectations and report failures without manual effort. It lets teams check every change quickly and consistently.
Unit testing is the practice of writing small automated tests that check individual functions, classes or modules in isolation. They run in milliseconds and catch regressions as soon as code changes.
User acceptance testing (UAT) is the final phase of testing, in which business users or clients check that software meets their needs in realistic scenarios. It comes before the software is approved for release.
Integration testing checks that separate parts of a system work correctly together. Typical targets are a service and its database, a message queue or another team's API, rather than each piece alone.
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