We are searching for a full stack developer for our team, is there a good resume software that we can use for free for this first position?
I'd recommend RecruiterBox as long as you can focus on filing one position at a time. It let's you accept up to 200 applicants for 1 position for free. http://recruiterbox.com/recruitment-software-pricing-with-free-signup/
Also, There are quite a few others out there most of which offer free 30 day trials or free access to their platforms with feature limits on them vs the company's paid offerings. Based on the way you phrased the question, this app should do the trick!
Side note - if you're making use off Google apps - just create a form for submissions. It's always free.