Founder Intern (now and Summer 2026)

Posted Yesterday
Be an Early Applicant
San Francisco, CA, USA
In-Office
Internship
Artificial Intelligence • Fintech • Software • Financial Services
The Role
Work directly with founders at an AI-driven fintech startup to ship products and support all functions (engineering, growth, operations, sales, customer support). Operate autonomously on vague prompts, build systems, tackle unglamorous tasks, and move quickly in a high-paced, in-person San Francisco environment.
Summary Generated by Built In
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!

Skills Required

  • In-person in San Francisco
  • Available to start immediately / can start next week
  • Very technical
  • Relentlessly resourceful
  • Learns fast and moves quickly
  • Cares about quality
  • Ability to operate with extreme autonomy in an unstructured, high-paced environment
  • Willingness to handle the hardest, most boring, least glamorous tasks
  • Can take vague prompts and turn them into working systems independently or by rallying others
  • Comfortable working directly with founders and cross-functional teams
Am I A Good Fit?
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The Company
768 Employees
Year Founded: 1972

What We Do

Kastle AI is an AI platform for consumer lending and servicing that provides an AI operating system to automate borrower interactions, ensure compliance, and reduce costs for mortgage lenders. Using AI voice agents, the platform integrates with existing contact centers and payment systems to modernize operations without disruption, managing high-volume phone calls from loan inquiry to payoff.

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