Founder Intern (now and Summer 2026)

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.

You Will

• 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.

Ideal Candidate

• 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.