I have developed a very diverse skill set and work experience by working half of my engineering career with short-term, full time employers who contract my services to a client firm. My experience is in multiple industries as well. I have an ability to quickly adapt to a new project or office setting as well as the diverse skills obtained through job shopping.
My first employer of 11 years had me involved with multiple projects, often moving me to a project in need of a good audit prior to release of drawings and specifications. I also worked in their cost estimating, as well as engineering and design.
Unfortunately too many HR persons perceive the mutiple places I have worked as a job hopper instead of a person who can quickly adapt to changing environment. I also have the gray hair or no hair syndrome, which some will not admit they do not hire.