HDR has summer internships in our architecture group. They are pretty competitive so having a strong resume and professors willing to serve as a reference would help. HDR has been #1 in Healthcare design for about 25 years, but also does a lot of civic and tech work.
The student should do some research on top firms in the industries they are interested in, and search their "careers" page for internships. We try to hire our interns before the end of January, or even in December, but not all firms start as early as we do.