---
title: 'Software Engineer - Intern at Kastle'
canonical: 'https://feeny.ai/job/software-engineer-intern-kastle-san-francisco-25ekajcm3kk7'
type: 'job'
last_seen: '2026-09-05'
---

# Software Engineer - Intern at Kastle

- **Company:** Kastle
- **Location:** San Francisco, CA
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-08-07
- **Last confirmed live:** 2026-09-05
- **Apply:** https://jobs.ashbyhq.com/kastle/6f32db51-de45-472f-a9c8-d9419d3634ee

## Job description

## ABOUT KASTLE

Kastle is building the AI employee for consumer lending. We work with some of America's largest banks and mortgage lenders, helping them scale their contact center and compliance operations using autonomous AI Agents that process payments, originate loans, and help customers get a world class experience during the biggest financial decisions of their lives. We've processed over $1 billion in transactions and are backed by Y Combinator and Commerce Ventures. If you are interested in building AI that is applied in the real world where precision, reliability, and performance matter and redefine access to credit across the world, apply below.

## ABOUT THE ROLE

We're looking for a Software Engineer Intern who is excited to build products that are used by millions of users every month. As an intern, you won't spend your summer fixing minor bugs or working on isolated projects—you'll work alongside experienced engineers to design, build, and ship production software and AI Agents that is deployed at some of the world’s largest banks.

You'll join a small, fast-moving team where you'll have real ownership, receive frequent feedback, and learn how software is built from idea to deployment.

If you're curious, enjoy solving difficult problems, and want to grow as an engineer by building meaningful products, we'd love to meet you.

## WHAT YOU'LL DO

- Ship agent capabilities that run in production at national banks and servicers
- Contribute to evals and QA harnesses that catch failure modes and makes reliable AI scale in production
- Work with the latest voice and language models — latency, interruption handling, grounding, tool use — and integrate them into enterprise environments
- Sit in on real customer calls and learn directly from executives and how AI gets deployed in the real world
- Contribute to technical documentation and internal tooling.

## WHAT WE'RE LOOKING FOR

- Currently pursuing or recently completed a Bachelor's / Master's / Bootcamp degree in Computer Science, Software Engineering, or a related field.
- Strong programming fundamentals in at least one language such as Python, Java, Go, JavaScript, TypeScript, or C++.
- Experience building personal projects, coursework, hackathon projects, or previous internships.
- Familiarity with web development, APIs, databases, or cloud platforms is a plus.
- Strong problem-solving skills and attention to detail.
- Comfortable working in a collaborative, fast-paced environment.
- Eager to learn, ask questions, and continuously improve.

## BONUS POINTS

- Experience building agents that operate in realtime settings
- Interest in consumer lending, banking, or financial services

## WHAT YOU'LL GAIN

- A rare opportunity to contribute to a company that will redefine an entire industry
- Hands-on experience building software used by real customers.
- Mentorship from experienced engineers.
- Exposure to the full software development lifecycle—from planning to production.
- Opportunities to own meaningful projects and present your work.
- A collaborative team environment focused on learning, growth, and impact.

## About Kastle

## Core Business
- **Primary industry**: Consumer lending / Mortgage servicing technology (Fintech)
- **Target customers**: FDIC-insured banks, independent mortgage banks (IMBs), and large consumer lenders (B2B, Enterprise)
- **Mission or purpose statement**: To help traditional financial services companies better interface with their customers by automating high-volume phone calls with compliant AI agents.

## Products & Services
- **Avery (Servicing Agent)**: AI voice agent that handles borrower inquiries, payment collection, escrow questions, and loss mitigation. Integrates with ICE’s MSP system.
- **Collections Agent**: Automates payment reminders, engages delinquent borrowers early, and recovers past-due accounts.
- **Compliance Agent**: Monitors and scores every interaction against regulations (FDCPA, TILA, UDAAP, RESPA, TCPA) for 100% QA coverage.
- **Loan Officer Assistant**: Qualifies new loan inquiries and automates pre-qualification calls.
- **Sentinel (QA & Compliance Agent)**: Real-time monitoring and automated scorecards for borrower calls and servicing documentation.
- **Agent Builder**: Allows lenders to turn SOPs into AI agents using natural language, with no-code configuration.
- **Platform features**: Omnichannel support (voice, SMS, email, chat), simulation testing, transparent observability, and integration with existing contact center, payment processor, and LMS systems.

## Market Standing
- **Valuation**: Not disclosed (private startup)
- **Key Metric**: Total funding of $510,000 (Pre-seed round led by Y Combinator, June 2024)
- **Notable Investors/Partners**: Y Combinator (lead), ICE Mortgage Technology (integration partner)
- **Growth Signals**:
  - Headcount: 10 employees (+66.7% YoY)
  - Won LendingTree’s 2024 Innovation Challenge (Nov 2024)
  - Featured in a16z’s February 2025 fintech newsletter on voice AI
  - Integration with ICE’s MSP servicing system (April 2026)
  - Most deployed AI voice agents in the mortgage industry (per website)
  - Active job postings: 8 positions, with 300% yearly increase in listings

## Competitive Advantages
- **Purpose-built for compliance**: Pre-trained on key lending regulations (FDCPA, TILA, UDAAP, RESPA, TCPA) with a proprietary Compliance Engine.
- **Enterprise-grade integrations**: Direct connectivity with ICE’s MSP (the dominant mortgage servicing system) and other core systems.
- **Fast time to value**: Go-live in days with out-of-the-box agents that map to existing workflows.
- **Transparent AI**: All responses are fully explainable with built-in reasoning, enabling audit-ready operations.
- **Battle-tested track record**: Claims to have the most deployed AI voice agents in the mortgage industry, with proven metrics (70% lower cost per call, 40% lower handle time, 90%+ CSAT).

## Strategic Focus
- Deepening integrations with core mortgage systems (e.g., MSP) to reduce friction for large lenders.
- Scaling the AI agent workforce across the full lending lifecycle (origination, servicing, collections, compliance).
- Expanding from voice to true omnichannel (SMS, email, chat) and adding more pre-built agent types.
- Growing the enterprise customer base among FDIC-insured banks and IMBs.

## Why Work Here
- **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.

## Sources
1. [kastle.ai](https://www.kastle.ai/)
2. [ycombinator.com](https://www.ycombinator.com/companies/kastle)
3. [linkedin.com](https://www.linkedin.com/company/kastleai)
4. [cbinsights.com](https://www.cbinsights.com/company/kastle)
5. [ycombinator.com/jobs](https://www.ycombinator.com/companies/kastle/jobs)

## Other roles at Kastle

- [Head of Sales](https://feeny.ai/job/head-of-sales-kastle-san-francisco-d0xkyqh7a74w) — San Francisco, CA
- [Senior Product Manager](https://feeny.ai/job/senior-product-manager-kastle-san-francisco-w8f083jn8y91) — San Francisco, CA
- [AI Deployments Lead](https://feeny.ai/job/ai-deployments-lead-kastle-san-francisco-dk0d9gy0kw3b) — San Francisco, CA
- [Mortgage Originations Process Specialist](https://feeny.ai/job/mortgage-originations-process-specialist-kastle-san-francisco-cpcar50m80p4) — San Francisco, CA
- [Founder's Office](https://feeny.ai/job/founder-s-office-kastle-san-francisco-cfysxyhxtfnp) — San Francisco, CA
- [AI Trainer (Part-time)](https://feeny.ai/job/ai-trainer-part-time-kastle-remote-gawt2gvp2g56)
- [Agent Product Manager](https://feeny.ai/job/agent-product-manager-kastle-san-francisco-2mq46j3a94ka) — San Francisco, CA
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- [Enterprise Account Executive](https://feeny.ai/job/enterprise-account-executive-kastle-san-francisco-h9mz7tqdf5ww) — San Francisco, CA
- [Founder Intern (now and Summer 2026)](https://feeny.ai/job/founder-intern-now-and-summer-2026-kastle-san-francisco-fk1x0epnjmnc) — San Francisco, CA