I'm an "Apple Digital Masters" (formerly "Mastered for iTunes") certified mastering engineer, with main focus is tonal balance, dynamics and overall soundquality - not about participating in the loudness war (which is so last decade anyway).
I work with a hybrid setup of hardware and software, in a proper acoustically treated room.
I believe in enhancing the sound while staying true to the original vibe.
I stay up to date on the various streaming/download platforms standards, to make sure your music gets the best possible playback quality across all services.