When writing a resume, it is important to include job titles to help relay your roles and responsibilities to potential employers. A job title is a specific designation of a post within an organization, normally associated with a job description that details the tasks and responsibilities that go with it. There are two main areas of a resume where job titles can be included:

1. Resume Summary: This is the section at the very top of your resume where you can write a concise statement that conveys who you are and the position you seek. This is also where you can write professional job titles that describe your experience and skills, such as "Marketing Manager" or "Software Engineer".

2. Work Experience: This is the section where you can describe your previous work experience, and it is important to include job titles that accurately reflect your roles and responsibilities. It is not necessary to use the exact job titles given by previous employers, and it may be more effective to use targeted professional job titles that accurately describe your experience.

When including job titles on a resume, it is important to be concise and clear. A dedicated job title section that lists the job title you are seeking can be especially helpful if the job title relays a specialization, such as "DevOps Engineer".