What Are Your Biggest Challenges When Working with ETL Pipelines? or How Do You Optimize Performance

Been there. My pro tip: log *everything*. Like, not just errors—metrics, row counts, timestamps.

Tools like Datadog or Sentry help visualize where things break.

And if APIs are the culprit, mock them in tests with Postman or WireMock. No more surprise changes ruining your day.