Hi Valentin,

For projects that are fairly open-ended, you can provide a fixed quote that takes into account enough buffer to ensure you are safe. The downside is that could mean losing the opportunity due to having a price that's not competitive. However, that's better than risking your business / layoffs on what could become a wildly unprofitable project.

There are plenty more ways to go about it, but in the end it's going to come down to either (1) determining the price where you feel you have derisked enough to make the potential reward worthwhile, or (2) seeing if someone with experience in the project area can give you a more accurate estimate.

Wish you well with this!
Ryan