The post process in recording acoustic music is often referred to as mixing, as this process happens after recording the musicians. In electronic music the workflow is usually quite different, and in this context the term “post processing” would typically not refer to the actual mixing process but rather what is applied to the resulting mix-down.
With today’s increasing amount of music software and musicians creating electronic music in their homes, post production is often done by the musicians themselves. There are professional options in abundance too. Some dedicated music academies have celebrated electronic music producers teaching music production courses. For example, the famous English house producer D. Ramirez teaches audio post production at SubBass Academy of Electronic Music.
The process typically involves equalization, audio level compression, multi-band audio compression, and limiting. This process somewhat overlaps but should not be mistaken for the term mastering, as post production is usually performed on a per-song basis, whereas mastering is aimed at preparing an entire list of songs for a specific media type.