How did you implement parallelization?

To implement parallelization, I usually analyze tasks for independent parts that can be executed simultaneously. In test automation, for example, I used the following approaches:

• Parallel test execution: I divided tests into groups and ran them concurrently on multiple threads or machines, using tools like Jest with the --maxWorkers parameter or Selenium Grid.
• Data-level parallelism: if tests depend on a set of data, I ran the same test with different data in parallel.
• Asynchronous operations: in automation scripts, I used asynchronous calls and Promise.all to perform multiple requests or operations simultaneously.

An important aspect was ensuring test isolation so that parallel execution did not lead to conflicts or race conditions. For this, I used separate environments, mock services, or cleaned the state between tests.