A bumpless hybrid organic glass interposer. One or more high density pattern (HDP) routing layers are placed on a functional, thin, carrier, separate from the intended organic substrate patch or package. The HDP layer(s) is/are then attached to the substrate package. The interposers achieve electrical connections between the HDP layer and underlying routing layer of the substrate package by utilizing a self-align dry etch process through landing pads connected to the HDP routing.