Your resume is completely dependent on you and your experience. If you often change jobs or work in many places, you better specify the experience that may affect the employer's opinion about you. When I was looking for a job, I stumbled upon resume writers reviews and decided not to upload myself with extra work and ordered a resume, while looking for interesting vacancies. But I knew exactly in what area I want to get a job, so the resume was accomodated to this field.