More personnel changes at Revolut are in motion, as a key member of the leadership team leaves for Barclays, and two former Amazon staffers join the London-headquartered neobank, including a new chief operating officer. TechCrunch understands that Chris Sing, Revolut’s head of regulatory compliance is leaving to take up the position as Barclays’s new chief of staff to the group chief compliance officer. He joined Revolut in December 2018 and has spent a little under two years at the multi-unicorn fintech. In a gamekeeper-turned-poacher styled career move, prior to Revolut,…