Looking on the internet deeply has found these results:

I am interested in to work for your billing company is the most popular phrase on the web.

I am interested to work for your billing company 13,930,000 results on the web	I am interested in to work for your billing company 14,420,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	I'm very pleased that you are interested in my work. I'm sure they'd all be interested in your work. But I'm more interested in the work. You know, I am actually interested in your work. I am very interested in his future work I have to keep an eye on him. Yes, I've seen nothing of your drab little land yet, but I am interested in your work. Yes, I've seen nothing of your drab little land yet, but I am interested in your work. I was interested in their work.

I am interested to work for your billing company

13,930,000 results on the web

I am interested in to work for your billing company

14,420,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

I'm very pleased that you are interested in my work.
I'm sure they'd all be interested in your work.
But I'm more interested in the work.
You know, I am actually interested in your work.
I am very interested in his future work I have to keep an eye on him.
Yes, I've seen nothing of your drab little land yet, but I am interested in your work.
Yes, I've seen nothing of your drab little land yet, but I am interested in your work.
I was interested in their work.