Kastle
Kastle is an artificial intelligence company in San Francisco, United States, founded in 2024. It has raised $26.8M across 3 rounds, most recently a $24.0M Series A in September 2026.
AI agents for mortgage servicing
- Headquarters
- San Francisco, California
- Employees
- 1–10
- Founded
- 2024
- Business Model
- B2B
- Website
- kastle.ai
- Total Funding
- $26.8M
- Last Round
- $24.0M Series ASep 2026
- Rounds
- 3
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 3 funding rounds and 4 investors for this company. The full record is or through the API.
About
Kastle is an AI voice agent for mortgage servicing. We help servicers collect payments, verify new borrowers, and qualify new loan inquiries over the phone. Rishi and Nitish met at UIUC where they graduated with degrees in systems engineering and computer science. Rishi was the founding Product Manager for Redfin’s Mortgage Marketplace at 22 and grew the business from $3M to $6M in revenue in 9 months. Nitish patented Verkada’s motion search system and was the youngest tech lead at the company at 23. While building Redfin's Mortgage Marketplace Rishi realized traditional lenders didn't have the infrastructure to service online inquiries and were losing customers. Nitish and Rishi are building Kastle to help traditional financial services companies better interface with their customers.
Summary
It lists 1–10 employees. It has raised $26.8M in total across 3 rounds, most recently a $24.0M Series A round in Sep 2026. Investors include Y Combinator, Commerce Ventures and Insight Partners.
Tech & App Stack
6 technologies & apps tracked
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Funding History
Sep 2026
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Funding: Pre-Seed through Series A. Amounts, valuations, and investors where available.
Investors
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