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Kastle

Kastle

San Francisco, CA

AI voice agents for mortgage servicing

12 open roles
Fintech1-50SeedFounded 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

12
Kastle

Software Engineer - Intern

KastleSan Francisco, CA

Build and ship production software and AI agents for banking and lending customers, contributing to agent capabilities, evaluation systems, integrations, and internal tools. The internship requires programming fundamentals and project experience, with exposure to the full software development lifecycle.

Salary not listedOn-siteEntry levelFullstack Engineering
Kastle

Senior Product Manager, Originations

KastleSan Francisco, CA

Own end-to-end product for AI origination agents at a YC-backed fintech. Partner with customers and AI engineers on roadmap, deployments, adoption, evals, and autonomy decisions for mortgage/lending vertical. Requires 4+ years PM experience and hands-on LLM work.

200k – 250k/yrOn-site4+ YOEProduct Management
Kastle

AI Deployments Lead

KastleSan Francisco, CA

Lead end-to-end strategic deployments of AI lending agents for banks and mortgage lenders. Partner with customers on adoption, debug agent behavior using logs/prompts/evals, implement prompt/logic changes, drive expansions, and shape product direction in a high-stakes compliance environment. Requires 4+ years customer-facing experience and hands-on LLM/agent expertise.

200k – 250k/yrOn-site4+ YOESolutions Architecture
Kastle

Mortgage Originations Process Specialist

KastleSan Francisco, CA

Serve as the mortgage origination domain expert, mapping end-to-end workflows, systems, and edge cases to train and measure AI voice agents. Requires 5+ years operational experience as a processor/underwriter/originator with LOS platforms like Encompass/Empower and technical aptitude for APIs and data schemas.

Salary not listedOn-site5+ YOEOther
Kastle

Founder's Office

KastleSan Francisco, CA

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.

Salary not listedOn-site3+ YOEBusiness Operations
Kastle

AI Trainer (Part-time)

KastleUnited States

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 – 30/hrRemote5+ YOEAI Research
Kastle

Agent Product Manager

KastleSan Francisco, CA

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 – 180k/yrOn-siteProduct Management
Kastle

Staff AI Engineer

KastleSan Francisco, CA

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 – 250k/yrOn-siteML Engineering
Kastle

Enterprise Account Executive

KastleSan Francisco, CA

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.

Salary not listedOn-site6+ YOEAccount Executive
Kastle

Founder Intern (now and Summer 2026)

KastleSan Francisco, CA

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 – 100k/yrOn-siteEntry levelFullstack Engineering
Kastle

Forward Deployed Engineer

KastleSan Francisco, CA

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 – 200k/yrOn-site1+ YOESolutions Architecture
Kastle

Founding Engineer

KastleSan Francisco, CA

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 – 200k/yrOn-siteBackend Engineering