[Malak Falco]

Lexicanum has had nothing really to offer on how ranks are determined or really the specific rankings within each subsection other than Magos being one of the upper levels, then you have the fabricator-general and other elite of the elite sorts.

Pretty sure it follows general monastic conventions but there are the inevitable twists and turns and such to cloud the worky bits from non-mechanicus followers.

 

[BrotherArcadius]

I'm pretty sure it goes like this:
Fabricator-General
The Ruling Priesthood (Techpriests):
Magos
Logis
Genetor
Artisan
The Ordinary Priesthood (Techpriests):
Electro-priest
Enginseer
Rune Priest
Transmechanic
Lexmechanic
Servitor

 

[Oldenhaller]

there's a list in the dark heresy main rulebook

 

[Androxine Vortex]

there's a list in the dark heresy main rulebook

Would there be a way for you to post it? This would actually really help me out.