Important information that should be in an internship offer letter. These basic sample offer letters consist of "core" data that should be included in an offer letter.Craft a compelling internship offer letter with our comprehensive guide. The internship offer letter should include the start and end dates of the internship, as well as the number of working hours per week. This letter offers an unpaid internship position with a department, providing hours per week from a start date through an end date. Unlock the potential of internships with our free internship agreement template. See what to include and how to get the best from your intern. We are pleased to offer you the position of Senior Software Engineer at our esteemed company. On behalf of the company, I welcome you to Friendly Green. Letter must be on company letter head.