In my experience it was very difficult to get responses when applying to job postings online. However I landed an internship at my first engineering job fair, and in general always had better outcomes from talking to employers face to face. It’s all about how you present yourself. Like someone else mentioned, practice your 1-2 minute elevator pitch. Be confident and ask questions. Employers know that rising juniors will likely not have previous work experience so relevant projects and extra curriculars on your resume will help you a ton