Mention Past Successes
"Formerly enhanced database systems at Microsoft" is a smart way of showcasing your past achievements. It indicates the kind of work you did, and the level of company you've worked at. This gives a sense of your experience level and skill set without even clicking into your profile.
Express Your Passion
Expressing that you're "Passionate about creating efficient data storage solutions" puts a little bit of your personality into your headline. It demonstrates that you're not just doing a job, but that you're genuinely interested and invested in your field which can be a real plus for potential employers.
Add an Experience Modifier
By saying you're an "Experienced Data Engineer", you're setting the tone right off the bat. It subtly indicates that you're not a newbie, that you've been around the block and have gained some solid experience and skills in your field.