so potential job opportunity there.

I performed well in the interview at the company, c I have a potential job opportunity there.
Please check grammar of the sentence, telling my friend about the interview attended on the phone

The second does not really follow from the first.
I would say:
I performed well in the interview at the company, so I think I stand a good chance of getting the job.

Kumarc said:

"I performed well in the interview at the company, c I have a potential job opportunity there."

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Why is there a "c" after the comma?

Kumarc said:

Please check the grammar of the sentence, in which I'm telling my friend about the a job interview attended that took place on the phone.

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Note my corrections above. The fact that the interview was by phone is irrelevant to your question.

emsr2d2 said:

Why is there a "c" after the comma?

Note my corrections above. The fact that the interview was by phone is irrelevant to your question.

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This was not a telephonic inteview. It was a walk-in interview. I was telling my friend on the phone about how I performed at the interview.

Why is there a "c" after the comma?

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Sorry, this is a typo. I missed "so" here.

Kumarc said:

Please check grammar of the sentence, telling my friend about the interview attended on the phone

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Kumarc said:

This was not a telephonic telephone interview. It was a walk-in interview. I was telling my friend on the phone about how I performed at the interview.

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OK, so now you know that "the interview attended on the phone" suggested that it was the interview that was on the phone.
I'm not sure what you mean by "a walk-in interview". Usually, "walk-in" means that you don't need an appointment (such as when you go to the hairdresser/barber or a clinic). It's unusual, here at least, to be able to simply turn up somewhere and have a job interview that hasn't been pre-arranged. I think perhaps you meant "an in-person interview" (rather than on the phone or by Zoom or similar).

Say you might get a job there or that you might get hired. (We already know there's a job opening. That's why they're interviewing people.)