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What are the common pitfalls that invalidate an A/B test?

Running an A/B test is easy; running a valid one is hard. The signal is naming the traps that produce confidently wrong conclusions and the fix for each. Here is the checklist a senior experimenter carries.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Running an A/B test is easy; running a valid one is hard. The signal is naming the traps that produce confidently wrong conclusions and the fix for each. Here is the checklist a senior experimenter carries.

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Applied AI Engineering·EvaluationSign in13mWhy your offline score and reality disagreeA system that scores well and disappoints users is the most common outcome in this field. Five specific reasons the two diverge, and the small number of production signals worth wiring up to catch it.
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