Software Engineer - Intern

Kastle

San Francisco💼 Internship🗓 2026-08-07 → 2026-09-26

Core

Building production software and AI Agents for consumer lending and mortgage operations at major banks.

Role type

Software Engineer Intern

Builds

AI Agents processing payments and originating loans for national banks

Domain

Fintech / Consumer Lending / AI

Deliverable

production ML models | product features

Required skills

Python, Java, Go, JavaScript, TypeScript, C++, web development, APIs, databases, cloud platforms

Responsibilities

Ship agent capabilities in production, contribute to evals and QA harnesses, integrate voice and language models, sit in on customer calls, contribute to technical documentation

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About Kastle

Kastle is building the AI employee for consumer lending. We work with some of America's largest banks and mortgage lenders, helping them scale their contact center and compliance operations using autonomous AI Agents that process payments, originate loans, and help customers get a world class experience during the biggest financial decisions of their lives. **We've processed over $1 billion in transactions** and are backed by Y Combinator and Commerce Ventures. If you are interested in building AI that is applied in the real world where precision, reliability, and performance matter and redefi