Looking on the internet deeply has found these results:

I've worked at ABC company. is the most popular phrase on the web.

I work at ABC company. 13,710 results on the web	I've worked at ABC company. 12,820,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Next to movies, I like cars. I work at a taxi company. I work at a taxi company. I work at a ice rink now. I work at Berkshire County Council. I work at a travel company. I work at a diamond wholesaler. I'm married now, I... I work at an insurance company. I work at Zara on the shop floor.	I've worked at Bluestar, Gordon. The domestic partners were lawyers, and the Millers worked at a tech company. I've only worked at this branch for a few years. I've worked at Associated Strategies for six years. There was a man... who worked at the company. Harder than I've worked at anything my whole life. By birth and by choice, I've been involved with the auto industry my entire life, and for the past 30 years, I've worked at Ford Motor Company. That's the same at every dealership I've worked at.

I work at ABC company.

13,710 results on the web

I've worked at ABC company.

12,820,000 results on the web

More popular!

I've worked at Bluestar, Gordon.
The domestic partners were lawyers, and the Millers worked at a tech company.
I've only worked at this branch for a few years.
I've worked at Associated Strategies for six years.
There was a man... who worked at the company.
Harder than I've worked at anything my whole life.
By birth and by choice, I've been involved with the auto industry my entire life, and for the past 30 years, I've worked at Ford Motor Company.
That's the same at every dealership I've worked at.