This is unusually broad, hands-on applied-AI work: you''ll own an LLM agent runtime and the full stack around it, including the tool layer that lets it act over Gusto''s systems, the Rails/GraphQL backend, the advocate-facing frontend, and the eval system that keeps it trustworthy while it touches live customer accounts. Here''s what you''ll do day-to-day: Design and build across the Otto platform, including the runtime and agent graph, the tool/action layer, the Rails/GraphQL backend, and the advocate-facing experience, owning a meaningful slice end-to-end.