One of the most important factors in having a successful career in Engineering that you enjoy and find fulfilling is to find a job type suited for your personality type. Almost all career choices require you to further choose whether you want a job in Research, Development or Application. Research is best suited for highly creative individuals. Application is best for structured people who are very organized. Development is sort of in the middle. Being happy in your career is to pick a job that is a good match for your person type.