The ratio of legacy vs green-field code differs from team to team, so depending on where you land there might be not too much low hanging fruits or innovation on the roadmap to do something meaningful other than bug fixes or small optimisations, so you might need to be creative and dig deep, so makes sense to check the expectations.
The platform is quite heavily loaded, so naturally, especially during big launches, stuff might break and you’ll need to fix it, it might be stressful and feel somewhat ops-y in a sense that you’re not “writing” the software, but more like operating it, so something to consider too.