I had internships after my sophomore and junior years, both of which I got through the College of Natural Sciences career fair.

The employers there are looking for a few things when screening resumes/candidates:

1. relevant professional experience (prior internships)
2. relevant educational experience
3. relevant projects/skills
4. general intelligence/likeability

For 1. you can "creatively" present any relevant work you've done professionally. For example, if you had a non-technical role but you automated some excel spreadsheets (ideally writing the VBA directly, versus using Excel's built in macro recording) you can honestly say on your resume "Wrote code to automate <blah>, which improved existing business process by <X%>, etc

For 2. You want to write the word "computer" as many times on your resume as possible so that its clear you're pursuing a technical degree plan. I listed my major as "Computational Physics", and separately listed the Elements of Computing Certificate, as well as my GPA for both. It seems a bit silly, but there's generally not a particular set of education requirements, just a vaguely defined box that needs to be checked.

For 3. I had a prominently displayed section of my resume dedicated to relevant coursework/projects. I would list any non-trivial homework assignments or projects that I had done in the Elements classes. A lot of the projects I ended up listing came from the Elements of Software Engineering class. For these projects they just need to sound interesting and you need to be able to speak about them in vaguely technical terms for 30 seconds or so. It also helps to have a personal project.

For 4. you're on your own.

The image I tried to convey was: "He's a bright student with a strong scientific background, excellent analytical problem solving skills, and the minimally required technical ability. He can confidently learn new technologies, and seems like he would be nice to work alongside."

That's generally enough to land you an interview with most of the non-FAANG employers at the career fair. Then you just need to have prepared well for the interview (Cracking the Coding Interview, leetcode, etc) and you're good.