Does the superintendent of the public school need to sign off on the work certificate even if the youth is a private or home-schooled student? July 29, 2021 19:04 Yes. Missouri law requires that work certificates are issued and signed by or under the direction of the superintendent of public schools in the district where the child lives. Related articles What if the superintendent does not sign the work certificate because he or she is not familiar with the student? At what age can a young person start working? Under Missouri law, what times and hours can 14- and 15-year-olds work? What is a work certificate? If a young person works for a parent does the law still apply?