There is a huge pool of exceptional junior engineers

When I hire juniors, I try to give them problems that I know they likely won't be able to solve in the interview because I want to see how they think about things. The problem has become that a lot of kids coming out of college have done little more than memorize Leetcode problems and outsourced classwork to AI. I've also seen less and less passion for the career as the years go by (ie. less computer nerds).

Unless the company is doing something that requires almost no special domain knowledge, it's almost inevitable that it's going to take a good while for them to on-board. For us, it usually takes about year to get them to the point that they can contribute without some form of handholding. However, that also mostly holds true for seniors coming to us from other industries.

I noticed I had an immediate bias against candidates that showed up to interviews using Windows (except for one person who was in WSL and seemed very comfortable in bash), or, not having their SSH key set up for cloning the github repo we used for our interview, or fumbling back and forth with their mouse between vscode and the browser, not using all their screen real estate, or not knowing even the most basic of keyboard shortcuts (I nearly cut an interview short once when I saw someone right click copy right click paste in vscode but I wanted to give them a fair shake so gritted my teeth and went through with the rest of the interview. They did poorly.). I never used it as a for/against factor but for me lack of interest in computers, and a lack of familiarity with the tools of our trade, is a red flag.

On the flip side, immediate green flags for me were: using linux, using keyboard shortcuts to manipulate windows / within the IDE, using an IDE other than vscode (vim/nvim or emacs are huge green flags), having custom scripts, having custom themes, or, the biggest one, self-hosting some applications. And Lo, these candidates also seem to perform the best in my experience.

That seems pretty opinionated, and by building a monoculture, persons with high openness to experience likely won't be drawn to your workplace, and you're also leaving on the table the potential that comes from diversity (a loaded term these days, but substantively still a valid point).

Depending on the kind of work you do and your customers, this may not matter to you, but in a lot of industries, you need the diversity to be able to properly represent and empathise with your customer base, who might be from a very different social cohort than your developers. And Linux desktops, which your customers almost certainly won't be using, may also make that difficult.

People who spend a ton of time ricing their Linux desktops may be bad at setting priorities. If you expect them to continue their ricing, but not do it "on the clock", you're implicitly age-discriminating and discriminating against people with families and/or hobbies and/or "a life".

Also keep in mind that your company is likely only one of a dozen or so workplaces that these people apply to in a given month, sometimes for many months before they land a job, and they probably haven't set up their computer specifically to impress you, but rather to fit the lowest common denominator among the requirements they face from all their application processes and educational activities, and some of that will require Windows.

Some points in parent comment are absolutely valid IMO. Would you hire a carpenter who walks back and forth to his toolbox to pickup at single nail at a time and then use the hammer with both hands near the head. And when cutting a 4x4 beam will use 1-inch strokes with the handsaw (again with two hands).

Using SSH to get the project files is not a good example of a hard to learn skill they need for the job, they should just have provided a zip on a web page or so or sent it directly to the user.

So to me it seems most of the test was just "have you done these trivial things before" rather than test if they can program web apps.

It would be like the carpenter being forced to buy nails and docking them points for now knowing where the closest shop to buy nails in are and taking time to look that up. Of course it is better if some look it up quicker, but its not a core part of the job. Then when they drove there, you gave them a manual stick car, so the ones who were used to automatic fumbled around in the car, also bad look! So now you see carpenters who drove manual were much better, as your biases told you! That is not really the skill you should care about, it is very quick to tell him where it is.