Celebrating Our Professional Engineers! Sigma has over 20 Professional Engineers who have earned their licenses in Louisiana. The path to becoming a licensed PE starts with the FE (Fundamentals of Engineering) Exam, followed by two years of work experience within the engineering industry, and culminates in passing the PE Exam to obtain the certification. This is the highest level of certification within the engineering field, allowing Professional Engineers to stamp packages and approve drawings, ensuring that all contents are structurally, mechanically, and operationally sound.