Only ingage him when he's low. He can disarm you and make you an easy prey for his damage dealers. He also make your shield useless so you can't use your regeneration card. Try to simply avoid him and focus on the backlines.Hes slow and hasnomobility
No matter if enemy Fernando is an Aggressive Nando or a Defensive Nando, even one good Wrecker dealer can easily disrupt both of these strategies. You reduce his teamwork, self sustain and disrupt abilities.
Nearly every Barik out there has a healing card in their loadout. It provides him a heavy sustain. Cauterize is an all around counter that also works against him very well in that aspect, even without a healer on enemy team!
when he jumps up in the air try to hook him down, he can do a lot more when he is above averyone. also he doesnt have any escape ability left after that.