Last November we were doing a ferrying flight in an Airbus 319. It was the second leg of the day, we were cleared initialy to FL340 even though we requested 380 as there was a 77W same route opposite direction at FL350.
As we visually cleared the traffic, I called ATC to advise them we were clear.
They instantly cleared us to climb. The PF managed the climb, quick as a flash.
I didnt have enough time to react nor realise, we hit the wake turbulence about 200ft in our climb and it was bad! Wings banked almost 20degrees to the left then to the right. I thought the AP would flip off but it remained on. Quite impressive ! I fly near the ITCZ almost on a daily basis and I can tell you i've never hit such strong turbulence before.