Job Description. Job Description. Overview. We are looking for experienced Geotechnical Drillers (Geohazard Mitigation Technician Level 3, GMT3) to join our team. As a GMT3 working for GSI, there is no typical day and the scenery changes often. You will be working outside with your hands in a wide variety of climates. On one project you may be working on a slope installing a retaining wall and the next project you could be stabilizing a bridge. T...