A new flexible modular foundation system is developed and patented in Turkey, USA and Europe which can be used as shallow foundation, deep foundation, tie beam, pile, retaining structure and similar civil engineering applications. The flexible foundation system is composed of alternating rigid blocks and flexible plates with a large hole at the center which are connected to each other with an anchor cable. The anchor cable is tensioned to the desired force with a tensioning mechanism which allows the rigidity of the pile to be tuned. The interfaces between the rigid blocks and the flexible plates are predetermined failure planes. The normal force applied by the anchor cable is the basis of the friction force at the interface which provides the vertical and horizontal capacity. The large number of interfaces along the pile/column system provides lateral capacity at each elevation. The main contribution of the invention is the connection system of the piles/columns to each other at the desired elevations using geogrids. When the spacing between the piles/columns is zero, larger sections with high moment of inertia is obtained preserving the flexibility of the system and increasing the resilience.