下面是美国签证在职证明的英文模板，你可以根据自己的情况进行修改：

TO WHOM IT MAY CONCERN,

This letter is to confirm that [Your Name] is currently employed as a [Your Title] at [Your Company Name]. [Your Name] has been employed with us since [Your Start Date] and is currently working full-time with a weekly work schedule of [Your Work Schedule].

As [Your Title], [Your Name] is responsible for [Your Job Responsibilities]. [Your Name] has demonstrated excellent job performance and has been an asset to our company.

As part of [Your Name]'s job responsibilities, [Your Name] may be required to travel to the United States for business purposes. We fully support [Your Name]'s travel to the United States and confirm that [Your Name] is currently employed with our company and has no intention of staying permanently in the United States.

Please do not hesitate to contact us if you have any questions or require further information.

Sincerely,

[Your Name]

[Your Title]

[Your Company Name]

[Your Contact Information]

总的来说，这封信需要包含以下要素： 1. 证明你的雇佣关系，包括你的职位、起始日期和工作时间表。

2. 简要说明你的工作职责和表现。

3. 确认你前往美国是为了商务目的，并且你不会在美国停留。

4. 提供联系信息以便对方查询。 最后，需要提醒的是，这只是一个模板，你需要根据自己的情况进行修改，使其更符合你的实际情况。