Given my failure to make a shaman/decker I figured I'd try and work out what roles go together. So here's what I have so far in primary/secondary format. Feel free to correct if I'm wrong.
Shaman/Face
Decker/Rigger
Decker/physical adept
Face/sniper
Street Sam/mage
Rigger/Sniper
Mage/decker (mage primary) is very hard to pull off even as a hermetic but decker/mage (decker primary) is a lot easier if you use your actions on decking stuff, with magic as buff/backup/"passive" (summoning, support stuff + sustaining, instead of spellslinging).
It's important to keep in mind that not all shamans have to be faces, and not all faces have to be shamans (Sams can do it quite well).
Decker/rigger actually is not easy due to the wide variety of skills needed. And both decks and good RCCs are expensive (setting aside the expense of the control rig). Drones and vehicles can be expensive. So it really depends. Deckers can usually make great First Aid healers though with their high Logic.
Decker/physad works pretty well since powers are almost entirely passive.
Face/sniper I don't think is a great combo, I don't think a sniper hanging back will be able to do the cool stuff with Leadership or Intimidation at that kind of range. The skillsets don't match well unless the face also does B&E and would have Con, Disguise, Impersonation.
As an aside, the "sniper" is...a skill set that is valuable (stealth and longarms) paired with an archetype (the loner who hides high above and shoots in ambush from long range, after staking out a blind) that is largely impractical on runs. Most shadowrun combat, in my experience, occurs at short-range, frequently indoors, and it is the players who are usually ambushed, not the enemies. Not to say the sniper archetype doesn't have value sometimes, just that it usually doesn't work out the way most people envisions hen they think "sniper." Sniper rifles are still incredibly useful at short-range firefights, if bulky enough for concealability to be an issue.
Street sam/mage: hahaha noooooo. Sams are dependent on losing Essence for power vs mages are dependent on having high Essence....yeah that's a big no. However, if you're a Mystic Adept gish, you might have the right idea with the right pairing of spells and PP.
Rigger/sniper: same issues with snipers in general, except in the case where your actual "sniper" is a flying drone or four, that's more viable...until your drones get shot down, but that's the perpetual issue with the rigger. I'm not the most up on riggers and Remote Control vs Jumped In being better.