下面是美國簽證在職證明的英文模板，你可以根據自己的情況進行修改：

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]

總的來說，這封信需要包含以下要素： 1. 證明你的雇傭關系，包括你的職位、起始日期和工作時間表。

2. 簡要說明你的工作職責和表現。

3. 確認你前往美國是為了商務目的，并且你不會在美國停留。

4. 提供聯系信息以便對方查詢。 最后，需要提醒的是，這只是一個模板，你需要根據自己的情況進行修改，使其更符合你的實際情況。