The phrase "to do the job" means to perform a task, complete an assignment or fulfill one's responsibilities. It can also refer to someone who is capable and efficient in their work, able to get things done effectively.
This device has a stainless steel warming chamber that is both easy to clean, as well as does the job better than plastic models. (checkpregnancy.com)
My stick blender just did not do the job for me. (elanaspantry.com)
This demonstrates your familiarity with the industry and company as well as your capability of doing the job for which you are applying. (greatresumesfast.com)