Giulio Rebuffo, former CTO of Erigon, has joined the Ethereum Foundation to focus on applied AI and client development. Rebuffo announced the new role on X, stating he will collaborate with the foundation's technical team and management. Rebuffo previously led the development of Caplin, Erigon's built-in consensus client, and contributed to Erigon's implementation of the Ethereum Merge. His move signals continued investment in bridging AI capabilities with Ethereum infrastructure development.