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Staff AI Engineer

Kastle -
San Francisco, CA

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Job Details

Full-time
$180,000 - $250,000 a year

Qualifications

AI platforms (beyond public GPTs)

Full Job Description

About Kastle

Kastle is building AI operating system for consumer lending, starting with mortgage. We work with some of America's largest mortgage lenders, helping them scale their contact center and compliance operations using AI-driven voice agents. Backed by Y Combinator, Commerce Ventures, and executives from Snapdocs, Google, and WePay, we are redefining lending with AI.

About the Role

As a Founding Applied AI Engineer, you'll be instrumental in building the technical foundation of Kastle's AI platform. You'll fine-tune large language models, design AI workflows for highly regulated enterprises, and ensure our voice agents deliver precise, compliant, and effective borrower interactions.

This role is ideal for an engineer who is passionate about applied AI, eager to solve real-world challenges, and excited to build the technical foundation of an early-stage AI startup.

What You'll Do

AI Model Integration: Fine-tune and deploy LLMs for real-time voice-based borrower interactions
Prompt Engineering: Design and iterate on prompt strategies to optimize AI performance and compliance
Evaluate LLMs and AI Agents: Build high quality evals using our proprietary datasets to benchmark AI agent performance and run experiments
Custom AI Solutions: Train and implement domain-specific AI models for consumer lending
Scalability & Compliance: Ensure AI solutions meet regulatory standards (FDCPA, RESPA, TILA) and scale efficiently
Data Pipelines & APIs: Build robust AI-driven workflows that integrate seamlessly with loan servicing platforms
Continuous Optimization: Monitor performance metrics and continuously improve agent quality and borrower experience

What We're Looking For

2+ years building and deploying ML/AI systems in production environments
Strong proficiency in Python and deep learning frameworks (TensorFlow, PyTorch)
Experience with LLM orchestration frameworks (LangChain, LlamaIndex, or similar)
Track record of shipping AI products that real users depend on
Strong product mindset and ability to translate business requirements into AI solutions
Excellent communication skills to collaborate across product, engineering, and compliance teams

Why join Kastle

Build what banks run on: Your code powers real borrower interactions at top-10 mortgage lenders—live in production from day one

Act like a founder: High ownership and autonomy with direct input on product, technical direction, and company culture

Learn fast: Daily customer exposure with rapid feedback loops—see your work deployed within days

Strong upside: Competitive salary, meaningful early-stage equity, and relocation support

Great team: Work alongside founders and engineers from Verkada, NVIDIA, Apple, Intuit, and Redfin.

Compensation Range: $180K - $250K

Apply Now

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Staff AI Engineer

Senior Developer Advocate

Generative AI & Machine Learning Engineer

Missionforce - Senior/Lead Forward Deployed Engineer (FDE), Public Sector

Senior Engineer - Agentic AI

Senior MLOps Engineer, LLMOps

Staff MLOps Engineer, LLMOps

Senior or Staff AI Infrastructure Engineer

Agent Engineer - US Remote

Staff Software Engineer, Agent Engineering - US Remote

Senior or Staff ML Systems Engineer, LLMs

AI Agent Engineer - US Remote

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