Baustoffprüfer (m/w/d)

Conduct and evaluate geotechnical laboratory and field tests to support soil mechanics proofs, including sieve analyses and load plate tests. Oversee earthworks in road construction projects through independent and external supervision according to ZTV E-StB and ZTV SoB-StB standards. Perform drilling operations such as small pile driving and sounding tests, alongside constructing groundwater monitoring sites. Collect environmental samples from soil, water, and air, as well as materials for demolition investigations. Contribute to expert opinions and geotechnical reports. Requires proven qualification as a construction material inspector or equivalent, valid Class B driver's license, and experience in the specified field. Based in Cologne, this role offers flexible working hours and mobile work options within a family-owned engineering group focused on environmental protection and circular economy.