Invariants is a specialized geotechnical engineering company based at Dhaka, Bangladesh. Sub-soil investigation, pile load testing (Compressive, tensile/uplift and horizontal), plate load testing (PDA), Sonic Logging and Low-strain dynamic testing of pile (PIT) are among the major scope of works. The company maintains a laboratory of its own. Field works are performed by experienced geotechnical personnel with the help of world class precision equipment. Invariants started geotechnical works by setting up of a laboratory in 1990’s and expanded its scope of work with the growing demand in the discipline of pile load testing and pile integrity testing for buildings, bridges and other civil engineering structures. From the mid-nineties with the help of well-trained and experienced engineers it took the country’s leading role in the field of geotechnical engineering discipline. Ever since, the company started to grow up earning reputation for its quality services and commitment. The company is run by engineers having vast experience at home and abroad in the relevant discipline.