Founder Intern (now and Summer 2026)

Kastle; San Francisco (CA); On-site; USD 20,664 - 27,552; Full time

Job summary

Kastle in San Francisco is seeking a motivated intern to start ASAP. As an intern, you will be part of a dynamic, fast-paced environment working directly with the founders and a small team. Your role involves shipping real products and tackling various tasks across business functions. The ideal candidate is resourceful, technically skilled, and can start quickly. Join Kastle to help automate workflows in the financial services industry with AI. Email us to express your interest and include 'Founder Intern' in the subject line.

Qualifications

• Relentlessly resourceful and learns fast.
• Cares about quality and is very technical.
• Can start next week.

Responsibilities

• Ship real products.
• Touch every part of the business.
• Handle difficult tasks with autonomy.

Skills

Resourcefulness

Technical skills

Fast learner

Job description

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.

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.

About Kastle

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