A regression suite that takes hours to run gets ignored. Build a tiered approach: smoke tests in 5 minutes, core regression in 30 minutes, full regression overnight.
Look for: selecting tests based on critical user journeys, business risk, and historical defect areas. Strong candidates discuss maintenance strategies (regular review, removing outdated tests, updating for new features), and balancing coverage with execution time. Best candidates mention progressive regression (run critical tests on every commit, full regression nightly).
Fundamental QA skill. Regression suites that grow uncontrolled become unmaintainable. Candidates who regularly prune and prioritise their suites show operational maturity.