Be Consistent. Professional resumes need to have consistent formatting. For instance, if you use bullet points to describe your responsibilities and achievements at one position, be sure to use bullet points in all other positions as well. Also, make certain that the bullet points are formatted the same way throughout. Lengthy resumes do not make you more impressive, and there are many other reasons to keep your resume short too. A good rule of thumb is to keep your resume to one page if you have less than 10 years of experience or at most two pages if you have more than 10 years of experience.