Geotechnical engineers investigate soil, rock, and groundwater conditions to design safe foundations, retaining structures, embankments, and slopes for India's roads, metros, dams, high-rises, and ports. Every project starts with a soil investigation report — SPT, CPT, plate load tests, triaxial and consolidation lab tests — and ends with a foundation recommendation that carries structural loads safely into the ground: raft, pile group, well, caisson, or MSE wall. In India through 2026, the specialty sits at the intersection of private infra construction (L&T Geotech, Tata Projects, Afcons), design consultancies (AECOM India, Sarathy Geotech, STUP), PSUs (Central Water Commission, NHSRCL, IRCON, RVNL), and niche firms (NDT-PRO India, ITASCA India for numerical modelling, Keller India for ground improvement). Entry requires B.Tech Civil + M.Tech Geotechnical from an IIT or NIT; without M.Tech the ceiling is site-investigation supervision rather than independent design sign-off.