Good morning Jake! You only had minimal grammar slips. Just continue doing this and I'm sure that you will improve a lot everyday. Good job! Here are your corrections. ^_^

Hello, my name is Tae Hyoung Kim and my English name is Jake. I was born on September 1st, 1987, so I am in my late 20's now. I work as a sales worker at Samsung SDS. My job is to introduce and sell our products to buyers and I have to be a people person so that I can fit well to my job. I have to meet a lot of people for my job and I have to know a lot about our products so I could explain them to our potential buyers. I must consider the profit when I work as a sales employee. Actually I’m still a rookie so I don’t have a specific job title yet. That’s why I’m nervous, but I’m confident that I'm gonna be a good rookie, even being a great role model to my juniors. I always prepare when I’m in-charge of a specific job. In my free time, I like to hang out with my colleagues. Also, I love to watch movies and go to nice restaurants with my family. We like to try new foods, so I search for new places online. I’m an only child. I live with my parents and 2 cousins now. They are younger than me. We are close like real siblings.