Shovel/Bolter Vet
 Veteran Build - Warhammer 40k: Darktide 

Quick guide below

The strat:

You engage hordes and more frail specialist (flamers, grenadiers etc) with the shovel. Abuse heavy hits, in my experience light attacks provide better single target damage (higher rending/armor piercing). Assist yourself with grenades to speed things up and lighten the pressure on yourself.

Whip out the bolter when something serious happens (beeline of carapace enemies, beeline of ragers, cluster of machinegunners etc). You can also use bolter to quickly get rid of incoming horde. Bolter can do impressive amounts of stagger to help your allies get out of the trouble. Be cautious with ammo though - you are gonna be stealing alot of it anyway. That said, absolutely do assist yourself with grenades.

To make a full use of your skills, try not to toggle between weapons too often (weapons specilist buffs).

The strong:

Everything. You have autonomous on demand toughness regen (aka shout). You have great horde control and damage with your melee. You have a powerful damage outburst with ranged. Stamina is great, dodges are pretty good... It is all you may want in a build.

The weak:

When you ambushed and have no space to move - you are most likely dead. Use grenades, shout, block to get you out. But this is the main endangering situation to you.

Also you are a machine that turns ammo into corpse starch. Prepare to be taking at least half of the ammo drops from across the map.