Senior Applied AI Engineer jobs in United States
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Kastle (YC S24) · 4 hours ago

Senior Applied AI Engineer

positionSan Francisco, CA
timeFull-time
remoteOnsite
seniorityMid, Senior Level
money$180K/yr - $250K/yr
date2+ years exp

Kastle is building an AI operating system for consumer lending, focusing on mortgage solutions. They are seeking a Founding Applied AI Engineer to build the technical foundation of their AI platform, fine-tuning large language models and ensuring compliance in borrower interactions.

Artificial Intelligence (AI)Financial ServicesMortgageReal EstateSaaS
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H1B Sponsor Likelynote

Responsibilities

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

Qualification

PythonDeep Learning FrameworksLLM Orchestration FrameworksAI Model IntegrationCustom AI SolutionsProduct MindsetCommunication Skills

Required

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

Benefits

Meaningful early-stage equity
Relocation support

Company

Kastle (YC S24)

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Kastle is a workflow automation tool for mortgage lenders and servicers.
dateFounded in 2024
location
San Francisco, California, USA
people-size11-50 employees
web-link
https://www.kastle.ai

H1B Sponsorship

Kastle (YC S24) has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)

Funding

Current Stage
Early Stage
Total Funding
$0.5M
Key Investors
Y Combinator
2024-06-01Pre Seed· $0.5M
Company data provided by crunchbase