Sierra raised $950 million in a funding round led by Tiger Global Management and Google Ventures, valuing the AI customer service startup at over $15 billion including the investment.

The three-year-old company builds conversational AI agents for managing client relationships and customer service operations.

Tiger Global Management and Google Ventures co-led the round, though Sierra did not disclose other participating investors or the specific breakdown of the funding structure.

The valuation represents a significant jump for the startup, which has focused on enterprise AI agents that can handle complex customer interactions across multiple channels.

Enterprise AI agents gain traction

Sierra competes in the rapidly expanding market for AI-powered customer service automation, where companies like Decagon and traditional providers are vying for enterprise contracts.

The funding comes as businesses increasingly deploy AI agents to handle routine customer inquiries, reduce support costs, and improve response times.

Sierra's platform allows companies to create AI agents that can understand context, maintain conversation history, and escalate complex issues to human representatives when needed.

The startup has not disclosed specific customer numbers or revenue figures, but the substantial valuation suggests strong enterprise adoption of its agent technology.

Sierra plans to use the funding to expand its engineering team and accelerate product development as demand for AI customer service solutions continues to grow across industries.