Cascade AI, a Seattle-based startup, has raised a $3.75 million seed round led by Gradient, Google's AI-focused venture fund.Cascade AI has developed an AI assistant to answer HR questions related to benefits, bonuses, leave, retirement, and more.The assistant automates over 50% of HR support operations, providing productivity gains for HR teams.Cascade AI is exploring ways to enhance the assistant's capabilities and serves organizations with more than 1,000 employees.