Marketing to students is a great way to launch a business - but it has challenges.
1 - Students have no money so what you offer needs to be extremely good value.
2 - If you sign a student to your service, they will be with you for life. So it's a great time to get engagement and follow them through their careers.

I have done several student-oriented marketing projects and here are some suggestions which could work for your project.
1 - get yourself in to face to face meetings with the careers team at universities. Tell the permanent staff about your service ask them if they would agree to be in a case study.
2 - Go and meet the engineering companies recruiters who hire graduates. Check that they would value what you offer. Ask them if they would agree to be in a case study.
3 - Recruit a few students who use your service and get great jobs with engineering companies. Write a case study.
4 - Find the groups / networks where engineering students hang out. Ask your student case study people to add you into the groups.
5 - Offer an awesome up-sell for every student who recruits a friend e.g. one on one coaching, preferential listing on the site when hiring engineering firms view candidates.
6 - Offer an awesome up-sell for every engineering firm who reads a student's bio and experience via your platform.

Numbers 5 & 6 are where you can generate 'virality" or "growth hacking" using tools to improve your brand reach and product visibility.