I like the idea of contracts with the corps. Maybe acting as a sort of Agenda or Role card like in AGOT or L5R.
I can see at least 3 or 4 different "skills" that could be used: Netspace/running, combat skill, streetwise, and influence.
There are at least 3 factions: NAPD, 14K, and Los Scorpiones. They could probably think up 1-3 more depending on how many they want.
I think 5 factions could be good, Maybe add the Corps as a sort of minifactions that you can use via contracts.