I go by the title I'm given. My job has been remarkably similar from company to company despite them all using different verbiage.

In my experience, job titles and capabilities rarely goes hand in hand. Seniority (junior, senior, principal) is sometimes projected to titles (web dev, developer, engineer) making it all the more confusing.

Where I come from, certain braches of industry have simply made it illigal. For example, a nurse cannot call themselves doctors. It pertains to most knowledge-based branches of industry here, except for software development.

There is one more:

- Bug-fixer: Deals with problems that four others will end up ignoring because they all moved on to other jobs creating new systems filled with more bugs that will be fixed 5 years down the road. Bug-fixers can like the work, but it's not glamorous because a lot of the time, it doesn't introduce new value.

They say people are good as their last project. It has rung true for me for years. I have become the bug-fixer again in my new project. But, it usually includes trying to come up with incremental improvements if there result of the issue was direct or indirect lack of something else.