A person, unless licensed under the present law, shall not practice or offer to practice engineering unless that person has been licensed under this chapter, except that:
(1) An engineer-intern may engage in such a practice as an employee of or under the supervision of a licensed engineer;
(2) A person holding a temporary permit under § 17-30-105(2) may temporarily provide engineering services for the purpose and in the manner provided by the State Board of Licensure for Professional Engineers and Professional Surveyors when granted the temporary license;
(3) A person may engage in such a practice if that person is employed by a professional engineer and acts under his or her supervision and direction; and
(4) A firm may not engage in the practice of engineering as a profession except under § 17-30-303.