Founder Intern (now and Summer 2026) at Kastle (San Francisco, CA)
Kastle· San Francisco, CA·
Role details
Work type
Onsite
Employment
Full-Time
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!
Why work at Kastle
- Culture: Early-stage YC startup with a small, high-agency team (10 people). Founders have strong product/engineering backgrounds (Redfin, Verkada). Emphasis on building mission-critical AI for a regulated industry.
- Work policy: Based in San Francisco (185 Channel Street). Likely in-office given the early stage and need for close collaboration.
- Notable perks/engineering culture: Opportunity to work on proprietary inference technology, compliance engine, and real-time AI systems. Roles span applied AI, forward deployment, and product management. High ownership and impact from day one.
- Growth trajectory: Rapid headcount growth (66% YoY), multiple open roles, and strong market traction suggest significant career growth potential.