Startups · AI

Founder Intern (now and Summer 2026)

Kastle · San Francisco · On-site

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About Kastle

One platform that keeps originations, fulfillment, and servicing moving 24/7, built for regulated work and connected to the systems you already use. Backed by Y Combinator.

About the role

We’re looking for an intern to start asap , in person in San Francisco. As an intern, this will be the most intense, competitive, and transformative experience of your life. You’ll work directly with the founders and a small team of exceptionally smart, driven peers who are building the operating system for consumer lending.

What they're looking for

  • Relentlessly resourceful
  • Learns fast, moves faster
  • Cares about quality
  • Very Technical
  • Can start next week
  • If that’s you, email us: founders at kastle dot ai. Just tell us why you’re a fit and add “Founder Intern” in subject. Keep it short. We’ll know
More about this role

We’re looking for an intern to start asap , in person in San Francisco.

As an intern, this will be the most intense, competitive, and transformative experience of your life. You’ll work directly with the founders and a small team of exceptionally smart, driven peers who are building the operating system for consumer lending.

Ship real products.

Touch every part of the business from customer support, growth, operations, engineering, and sales.

Work directly with founders and unblock them

Handle the hardest, most boring, least glamorous tasks — without flinching.

Operate with extreme autonomy in an unstructured, high-paced environment.

Take vague prompts like “build something that helps the company grow” and turn them into working systems — on your own, or by rallying others to help.

Relentlessly resourceful

Learns fast, moves faster

Cares about quality

Very Technical

Can start next week

If that’s you, email us: founders at kastle dot ai. Just tell us why you’re a fit and add “Founder Intern” in subject. Keep it short. We’ll know.

Kastle is automating manual workflows for the financial services industry using AI agents. We work with the largest mortgage lenders in America and are...

Read the full posting on Kastle's site ↗

Intern

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