Nexus, a Brussels-founded AI agent deployment platform backed by Y Combinator, has raised $4.3 million in a seed round led by General Catalyst. The startup, which operates from Brussels and San Francisco, aims to streamline the time between a business idea and a working deployment, using a self-service platform and dedicated engineering and enablement teams to handle integration, rollout, training, and ongoing optimisation. The funding will be used for product development, go-to-market expansion, and growing the implementation team.