Things to consider:
- Include the company logo and brief blurb about your company. According to CareerBuilder, doing so increases the credibility of your firm and positions it as an established, professional company.
- Be realistic in the qualifications (education, experience, degrees, etc.) versus salary offered.
- Proofread your posting for any misspellings or grammatical errors. If you think applicants are unprofessional because they have a typo on their resumes or if you reject applicants for their lack of attention to detail, then applicants can judge you the same way.