This is what I do in my job.

Hi again, I'am  I'm  writing here again because I want to learn how to write in English english.

First of all, I want to tell you about my job. I work as Simulation Engineer in an Oil & Gas Company. The process simulation consists in introduce of introducing the operation operating conditions in a software in order to find the best conditions in order to optimize the for optimizing production. Sometimes my job is boring, because I have to use the computer eleven hours per day.

Actually, I have worked here for 8 months working here. In this time, I have been learning a lot of new skills and tasks. However, I have to improve my english because I have to get a promotion.

Also, I am studying a Master in Business Administration.

Well, that's all for now, I hope to write you again soon.

Nice work, Niki!  Some of this writing is technical, and that is always the hardest to do (even for native speakers).   If you have any questions about my suggested corrections, let me know and I'll try to answer them. 

 The process simulation consists of introducing (creating/recreating?) the best conditions in order to optimize the production.

This is what I do in my job.

Hi again, I'am writing here again because I want to learn how to write in English.

First of all, I want to tell you about my job. I work as Simulation Engineer in an Oil & Gas Company. The process simulation consists in introduce the operation conditions in a software to find the best conditions in order to optimize the production. Sometimes is boring, because I have to use the computer eleven hours per day.

Actually, I have been working here 8 months. In During this time, I have been learning a lot of new skills and tasks. However, I have to improve my English because I have to get a promotion.

Also, I am studying working on a Master in Business Administration.

Well, that's all for now, I hope to write you again soon.