Design for text expansion from day one. If your layout breaks with 30% longer strings, it will break in German. Use real translated content in prototypes, not lorem ipsum.
Strong answers cover: text expansion (German can be 30% longer), right-to-left languages, date/number formatting, colour meaning across cultures, icon universality, legal requirements (GDPR, accessibility laws), and cultural sensitivity in imagery and copy. Best candidates discuss testing with international users.
Important for any product with international users. Candidates who have never considered i18n may struggle with global products. The depth of their answer reveals real experience versus theoretical knowledge.