Understudy / SecondSelf

Multi-tenant voice-AI roleplay training SaaS for sales reps: lifelike AI buyers that push back, then line-by-line rubric-based scoring on what the rep actually said. Three-act studio (author → rehearse → review) plus manager dashboard, with a scenario compiler, swappable LLM (DeepSeek default), Supabase/Postgres multi-tenancy with Row-Level Security, agentic onboarding via MCP, and a drop-in LiveKit voice worker. All 9 build phases complete; monorepo (Next.js 15 + React 19 frontend, FastAPI backend).