Is There a Need for Developers?

I started testing certain tasks, like small tasks that they got for me just to test some things. And I think it didn't take me too long that I started poking around the code. So when I tested something, I started looking in the code to see if I could find what the problem was and then I just fixed it. The way that I viewed it is they had a lot of senior developers and developers that were layered longer than I was.