Embodiments of the present disclosure are directed towards techniques and configurations for integrated circuit package assemblies including a glass solder mask layer and/or bridge. In one embodiment, an apparatus includes one or more build-up layers having electrical routing features and a solder mask layer composed of a glass material, the solder mask layer being coupled with the one or more build-up layers and having openings disposed in the solder mask layer to allow coupling of package-level interconnect structures with the electrical routing features through the one or more openings. Other embodiments may be described and/or claimed.