Low-profile circuit board assembly

Devices and methods for constructing low-profile, minimal-thickness electronic devices using existing production techniques are disclosed in this application. An electronic component and interposer form a sub-assembly. The sub-assembly is placed in an aperture in a circuit board with the interposer providing interconnections between the electronic component and the circuit board. The circuit board is coupled to the electronic component at least by one or more fluidic channels included in the interposer. The sub-assembly placed in the aperture in the circuit board as described herein conceals the thickness of the integrated circuit within the thickness of the circuit board, reducing overall thickness.