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Browse 3 real-world technical and behavioral interview questions about Legacy migration. Review scenarios, edge cases, and architectural best practices.
Write the entry criteria before the parallel run begins so the decision is a checklist rather than a mood, ramp through a stepped population with an abort condition at each step, and recognise that rollback stops meaning redeploy once the new system takes its first authoritative write.
Put a routing facade in front of the old system, migrate one business capability at a time, and treat dual-write as a reconciliation problem rather than two inserts: name a writer of record at every moment, shadow-compare before flipping reads, and sequence slices so value lands early.
Evaluating the engineering leader's capability to drive complex, long-running programs across the finish line when initial momentum has faded and organisational fatigue sets in. Use this engineering leadership answer to show the decision, trade-off, and evidence rather than a memorised definition. It also connects program delivery to the point an interviewer is testing.