help me please

Is this sentence writing correctly?
I had three years working for ABC Company
Is" working" in this sentence ok? I do not know why use gerund in this sentence
Help me please

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Should be either:

1.) I have worked for ABC Company for three years.

2.) For three years I have worked for ABC Company. (I don't recommend this because it carries an emphatic connotation.)

3.) I have been working for ABC Company for three years.

help me please

Is this sentence writing written correctly?

I had three years of working experience for the ABC Company.

I worked for three years for/at/in the ABC Company

I had been working for three years at the ABC Company

I had three years of work at the ABC Company.

Is" working" in this sentence ok? I do not know why use gerund in this sentence
Help me please