10 years ago, I developed software function called Number Portability. Do you know it? It is to change only mobile carrier without changing your phone number. At that time, a year has passed since I enter my company as new employee. That function makes me very hard. I got to work at 8 AM and I got off at 2~3AM for 2 month. I worked Saturday and Sunday at that time. After I finished this project, I felt really great about having completed this project successfully

1.  10 years ago, I developed software function called Number Portability.  -> 10 years ago, I developed a software function called Number Portability.

2. It is to change only mobile carrier without changing your phone number.GOOD JOB!

3. At that time, a year has passed since I enter my company as new employee.->At that time, a year has passed since I entered my company as new employee.

4. That function makes me very hard. -> That function makes me think very hard.

5. I got to work at 8 AM and I got off at 2~3AM for 2 month. ->I got to work at 8 AM and I got off at 2~3AM for 2 months.

6. I worked Saturday and Sunday at that time. -> I worked during/every Saturdays and Sundays at that time.

7. After I finished this project, I felt really great about having completed this project successfully. GOOD JOB!  or BETTER SAY -> After I finished this project, I felt really great about having completed it successfully.

Hi!

You did a good job, you were able to make good sentences, you were also very careful wit the verbs tenses, spelling and punctuation this time. Kudos! You have improved a lot. Keep up the good work! ;-)

Teacher Lovely