I have been working as a junior developer at a small company and my duties included to; create databases and stored procedures.

particles (a)
speaking in general about duties(no need to write past tense in this context)

I have always been interesting in development software.

I like to work with other people and I find that it's much easyier to achieve something when everyone works together and communicates well.

mush easier or easy(without the "much")

I sometimes am slower into complete my task compared to others because I really want to get things right.