Maybe try asking them what they consider overengineering and ask for some examples of times they've fought against an overengineered solution? Also ask about wh

Maybe try asking them what they consider overengineering and ask for some examples of times they've fought against an overengineered solution? Also ask about when code duplication is OK. I can't imagine you can gauge this easily otherwise as e.g. code examples are going to be too artificial but you could probably tell from their answers to the former questions if this is an issue they've thought about before.