I am a manager of a software developer who has been working late nights to complete a project in time for a deadline. He is a salaried employee so he does not get paid overtime.
I am very thankful that he is putting in these extra hours, and I want to thank him for his commitment and going the extra mile to get the project done in time, but I don't want to make him feel like what he is doing is expected. And more importantly, I don't want him to get burned out.
What can I say to him to strike a good balance of making him feel appreciated while not making him feel pressured to keep working late nights?
UPDATE - I ended up taking a "time off in lieu" approach and proposed to my boss that we credit the developer some PTO to offset the extra hours he's been working. I also thanked him profusely and repeatedly and made sure he knew that we (management) would do a better job in the future of planning enough time for features to be implemented and tested so that there is less likelihood of time squeeze situations. Thank you all for the invaluable input and ideas, it is much appreciated and I feel like it was put to good use! :)