英语翻译很简单的内容.XX系我单位在岗职工,年应发工资收入为X元.特此证明.X市X工程有限公司

I hereby certify that XX is a current employee （as a 职位) in the company. （He have been working here since .). His annual wage is X yuan.
X(市) X Engineering Co. Ltd
个人感觉写的不全,括号里是我觉得要补充的.