Please take note of the following format:
TO WHOMSOEVER IT MAY CONCERN,
This is to inform/state that Mr./Ms. .............. has been working with our organization since 01-01-2010 as a Fitter/Welder. During his/her employment with us, we have found him/her to be sincere and hardworking. We wish him/her all the best in his/her future endeavors.
OR
This is to inform/state that Mr./Ms. .............. had worked with our organization from 01-01-2010 to 01-01-2014 as a Fitter/Welder. During his/her employment with us, we found him/her to be sincere and hardworking. We wish him/her all the best in his/her future endeavors.
HR Executive
XYZ Company
I hope this format would be helpful.
Regards,
Alex Praveen