During the past year, I worked on a giant project ordered by a national government. This customer practiced what I would call a panic-driven-development - the project was ready and deployed months before the deadline, but the customer kept regularly calling us with panic that the government officials came, requested a completely new feature with a deadline of few days and if it wouldn't be ready on time, the funding would be pulled.
This resulted in me having to work on weekends, on my holidays, late into the early morning, often all three combined. Furthermore, I had to travel many times to meet the government officials on a short notice (This was in a different country than where my office was based in, which meant about 8 hours of travel one way). This resulted in me amassing more than 300 hours of overtime over a period of 4 months.
Now, I was updating my CV and since I had this experience, I wanted to present myself as an employee that didn't give up and managed to deliver the project despite these terrible working conditions - but how could I do that without portraying the government or the customer negatively? As much as I would love to, I'm scared it could be viewed as unprofessional if I complain about them.