In German, it's necessary to clarify in some way that job positions are open to both men and women, since most job titles are gendered. In English, Engineer and Developer, and almost all other job titles are not (waiter/waitress and actor/actress are the only exception that comes to mind). Therefore the German habit of placing "(m/w)" after advertised positions is at the least weird and very possibly off-putting when translated to English. Please don't do that: just leave it off.