Siena AI is an autonomous customer service platform built for commerce, designed to bring human empathy into AI-driven support. Siena's AI agents resolve customer conversations end-to-end across email, chat, SMS and social channels, handling order questions, returns, subscriptions and product inquiries while matching a brand's tone and voice. Founded by Lisa Popovici and Andrei Negrau, the San Francisco-based company positions itself as an empathic, brand-personalized alternative to generic support bots for e-commerce and DTC brands. Siena raised a $4.7M seed round in November 2023 backed by investors including Sierra Ventures, and has grown total funding to roughly $11M as demand for autonomous commerce CX agents accelerated through 2024.