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Kastle

AI voice agents for mortgage servicing

fintechSan Francisco, CA1-50SeedOnsiteFounded 2024Salary transparent
About

Kastle builds AI voice and SMS agents that automate borrower interactions like payment collection, loan qualification, and servicing inquiries for mortgage lenders and servicers. They integrate with existing loan servicing systems, telephony, and payment processors to execute actions, ensure regulatory compliance, and reduce call center costs. This enables 24/7 service, faster resolutions, and scalable operations without increasing headcount.

Tech stack
PythonJavaTypeScriptKubernetesPyTorchTensorFlowLangChainEvent-Driven Architecture
Open roles 8

Founder's Office

Acts as a force-multiplier in the Founder's Office, driving cross-functional execution on GTM, product ops, customer delivery, and internal initiatives for an AI lending startup. Requires high-agency operator mindset, structured thinking, strong writing, and 3-7 years in ops/consulting/fintech.

San Francisco, CABusiness OperationsOn-site3+ YOEExcelKpi Design

AI Trainer (Part-time)

Part-time AI Trainer annotates mortgage conversation data, provides feedback on AI responses, and tests system quality for mortgage servicing calls. Requires 5+ years mortgage customer service experience and industry knowledge.

30 – 30United StatesAI ResearchRemote5+ YOEQrpcAi Training

Agent Product Manager

Owns end-to-end deployments of AI voice agents for mortgage lenders, partners with executives on AI roadmaps and compliance, translates customer needs to engineering, and drives adoption and retention. Ideal for technical PMs or solutions engineers with enterprise deployment experience.

140k – 180kSan Francisco, CAProduct ManagementOn-siteAIAgentic AI

Staff AI Engineer

Builds and deploys fine-tuned LLMs and AI agents for real-time voice interactions in consumer lending, ensuring compliance and scalability. Requires 2+ years production ML/AI experience with Python, PyTorch/TensorFlow, and LLM frameworks.

180k – 250kSan Francisco, CAML EngineeringOn-siteLLMsPython

Enterprise Account Executive

Enterprise Account Executive drives sales of AI voice agents to large financial institutions, navigating complex enterprise cycles, winning RFPs, and building pipelines in mortgage lending. Requires 6+ years sales experience, quota attainment in B2B SaaS, and startup background.

San Francisco, CAAccount ExecutiveOn-site6+ YOEMEDDICOutreach

Founder Intern (now and Summer 2026)

Founder Intern works directly with founders on all aspects of an AI consumer lending startup, shipping products, handling operations from support to engineering, and operating autonomously in a high-intensity environment. Requires being very technical and relentlessly resourceful.

100k – 100kSan Francisco, CAFullstack EngineeringOn-siteEntry levelSalesGrowth

Forward Deployed Engineer

Forward Deployed Engineer embeds with key customers to build and deploy production AI agents for mortgage lending workflows, integrating backend/full-stack code with customer systems while owning the full development lifecycle and customer relationships. Requires 1+ years engineering and customer-facing experience with Python/Java proficiency.

140k – 200kSan Francisco, CASolutions ArchitectureOn-site1+ YOEJavaAPIs

Founding Engineer

Architects and owns core backend systems for real-time AI voice agents in consumer lending, focusing on low-latency performance, scalability with Kubernetes, and self-improving AI. Requires strong Python backend expertise and distributed systems knowledge.

130k – 200kSan Francisco, CABackend EngineeringOn-siteAI/MLPython