The phrase "at a mid sized" is not correct in written English; it should be "at a mid-sized" with a hyphen.
You can use it when describing a company, organization, or entity that falls within the mid-sized category, typically referring to its size in terms of employees or revenue.
Example: "She works at a mid-sized tech company that specializes in software development."
Alternatives: "in a medium-sized" or "at a medium-scale".
I'm a young journalist currently working in the print medium at a mid-sized daily.
A lawyer who works at a mid-sized downtown firm, she likes the convenience of her location.
Michael was a fortysomething middle manager at a mid-sized tech company who every day felt like a failure.
Assistant Professor Sameer Srivastava recently studied more than 10 million internal emails of employees at a mid-sized tech firm as part of his workplace culture research.
That's exactly what Claire (a pseudonym), a 33-year-old attorney at a mid-sized firm in Manhattan run by a prominent Republican donor, sees in her office.
He began his career at a mid-sized regional accounting firm, and later co-founded Saltzer Lassar Piccinnini & Co., LLC, where he was a senior partner.
A friend of mine recently took a new job as the head of learning and development at a mid-sized investment bank.
There is a special charm to working at a mid-sized, high-growth technology company: Quick and nimble like a startup, but the stability, process, and support of a public marketing data giant---it's the best of both worlds.
I've seen Dave Chappelle perform live twice: at the height of Chappelle's Show's success at a mid-sized theater in Fresno, California, and this year, in Los Angeles, on the eve of the Academy awards.
Alexis, a 31-year-old attorney at a mid-sized politically conservative law firm in Detroit, was working on two deals when a male partner she hadn't met before called her up and asked if she was getting weepy.
At a mid-sized public university in the Western US many students enrolled in Intermediate Accounting I (their first upper-division course) struggle with the rigor and academic demands of this course, resulting in failure rates of 30 45%.
