I think that those are too generic terms and that those terms cover a wide area of work. They can overlap very much. Most notably engineers can be engineers in

I think that those are too generic terms and that those terms cover a wide area of work. They can overlap very much. Most notably engineers can be engineers in very different areas, also a developer can develop kernel level C code, HTML pages or database queries, which can also be done by a programmer. That's why in general the job titles are more detailed (database administrator, software engineer, website developer, etc.).