What are the process and practices of requesting for pre-submission peer review from field experts? I am an undergraduate student in the field of computer science, researching on my own. I have completed writing a paper for my recent research project and all set to submit it to a relevant conference. Since I worked on the paper and project by myself, I am a bit unsure about some parts of the paper, technical as well as presentational.

In my faculty, no one works on this topic so I am left a bit alone on the entire process, including reviewing the paper before sending it to peer review. Is there a practice in academia where I can send some other professor, not affiliated with my work asking help with the paper and some feedbacks on it, sort of a pre-submission peer review?

Is it a good practice? And what would be a good way to do so, if it is done?
If you are an undergraduate and this is most likely one of your first papers, then yes, it is a good idea to have someone check it.

Even if none of the professors or colleagues you work with are familiar with your specific topic, they might still be able to give you advice regarding style and dos and don'ts in your field.

I would suggest to ask around, ask your advisor, ask others from your lab. That should have a higher chance to succeed than contacting a random professor who doesn't know you; they tend to focus their energy more on their own students.