'Creating a link' doesn't sound significant/difficult. I think of a link as a URL. In the future, you may want to lead with "I created a dashboard."
Assuming the dashboard required the development of some software code, you may have copyright protection over your work. Copyright protection for works related to employment require work for hire analysis.
17 USC 201(b) states: In the case of a work made for hire, the employer or other person for whom the work was prepared is considered the author for purposes of this title, and, unless the parties have expressly agreed otherwise in a written instrument signed by them, [the employer] owns all of the rights comprised in the copyright. The employer can show that a work is made for hire by establishing that it was (1) created by an employee (2) acting within the scope of the employment relationship. 17 U.S.C.A. Sec. 101
In this wonderfully outdated use of language, you are a servant: http://elephantcircle.net/wp-content/uploads/2011/10/restatement-second-of-agency.pdf. Look specifically at Section 228. 228 sets out three factors in determining if the work was created within the scope of employment. The analysis requires a further understanding of your situation and cannot be done for free, but this is where I would look to understand this matter.
Also, a labor law attorney may have an understanding of labor laws that would also come into play.
Answered on Dec 04th, 2013 at 9:38 AM