If you want a little more context about the stack and etc., a brief write-up can be found here: https://www.broadaxepublications.com/home/2022/1/1/song-of-the-broad-axe-publications-is-hiring-a-full-stack-developer-rzzsn
Edit: I should say that I am not a professional developer. I think I did a pretty good job with the project, but it is the work of an amateur.
If you are looking to be 'cost effective' I'd find someone actually interested in software engineering and not one of the many people who went into CS because of the pay.
Not knowing the specifics of your situation I'd try to find a student with some experience very similar to the work you are doing. The further away their experience is the lower your chances of success, as a student isn't likely to have a wide and deep skill set.
I recommend you work with the career/placement department. They can likely give you feedback on pay.