First observation. If you are trying to get a job in a company, find out who you need to contact and address the letter to that person. Usually company websites will give the name of personnel managers to whom applications are made.
Second observation. It is too informal for a first approach, and gives a potential employer no idea of you or your ability. In fact, it is somewhat off-putting in its casual nature. You need to tell them why you want a job in that particular company and what you can bring to the company.