-You may be stretched to succeed. As with many start ups, if you are salaried, what may be expected for you to accomplish in a standard 9a-5p schedule may not be possible.
While this is worth considering before accepting a position with Lumion, I do want to share that I'm personally incentivized to do extra work as Product has a direct impact to the success of the company and my expectation is that it will be rewarding in the long-run. This does not happen every week, but it is not an uncommon experience. Additionally, working overtime is a personal judgement call - it's never been asked of me (though I can't speak for other's experiences).