[enjoykaz]

The no-mixing part is what got me. If "viking" was just a job open to anyone, you'd expect genetic mixing in the burial sites. But Swedish groups went east, Danes south, Norwegians west — distinct genetic clusters throughout.

So it was a job, but one you apparently got by being born in the right place

[bazoom42]

Don’t take “job” literally. It wasn’t centralized in any way. It just meant if you had the resources you could build a ship, hire some henchmen, and go raiding. It is not surprising Swedes went East, Nowegians Northwest etc - just look at a map.