These job postings opened today on April 17 and close in four days (on April 21). This is highly compressed and highly unusual.

Being no fan of the current administration and its hangers-on, my brain quickly jumps to less flattering reasons for these short time windows. A four day application window favors people they want to select. They may well have told certain people in advance to be ready. I don't have direct "proof" of this, and I'm open to learning more, but the current administration has beyond exhausted any presumption of fair dealing.

I encourage anyone and everyone interested to apply and report back. NASA has a good mission and its needs people with a moral backbone and intrinsic pro-science drive.

I initially thought this was a call for technologists to commit to volunteering on a deep technical project for four days. That’s not enough time to design a component. But it might e.g. let some minor work on a protocol advance.

That has been the assumption in most of these cases. The agency must already have a list of people they want, so a short window keeps the risk of someone else jumping to the front of the queue.