Letter recommending

Hello, I would like to write a letter recommending for someone but I don't know if it's correct or not what I wrote. This is the letter:

TO WHOM IT MAY CONCERN:

Through this letter we want to mention that Mr. Alex Reátegui Gutiérrez, with identification number 41970620, has been working with us since August 12, 2015 until February 18, 2016. During that time his performing proved that he will be a valuable addition to any company, providing great teamwork and distinguishing of his nice treat for both personal and moral qualities, and a high spirit of improvement.

Mr. Alex Reátegui Gutiérrez worked under my supervision for a period of six months , as a Supervisor and Quality Control of Instrumentation, Its development was very satisfactory for both, the instrument area and the company that I represent.

The reason for his departure from the company is the completion of Project Puerto Bravo in which he has been working.

Mr. Alex Reátegui Gutiérrez has fully complied whit the tasks as may be assigned; in this sense our company and myself want to gladly recommend Him.

I Sign this letter on February 18, 2016, for the purpose it deems appropriate