Founding Engineer

Benefits

Parental leave

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Non-birth-parent leave

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Family-building benefits

• Fertility benefits: Not verified
• Adoption assistance: Not verified
• Surrogacy assistance: Not verified

Mental health support

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Relocation assistance

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Childcare support

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Learning budget

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Verification

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Salary

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401(k) match

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Market context

U.S. role benchmark (BLS OEWS)

$116,543 U.S. median for this role

Projected growth (BLS Employment Projections)

+9.8% - Much faster than average

Matched to SOC 15-1252 - Software Engineering aggregate by role bucket.

Source: U.S. Bureau of Labor Statistics, OEWS, May 2024 and Employment Projections, 2024-2034.

Role

Role function

Engineering From the posting source checked Jun 20, 2026

Seniority

Staff Plus From the posting source checked Jun 20, 2026

Work mode

Onsite From the posting source checked Jun 20, 2026

In-office days

5 days From the posting source checked Jun 20, 2026

Schedule

Shift type

Not verified

Weekend work

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Company

Equity

Offered From the posting source checked Jun 20, 2026

Application

Cover letter

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Assessment

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Deadline

Not stated

Where they hire

State eligibility is not yet verified.

About this role

Founding Engineer San Francisco | OnSite ABOUT KASTLE Kastle is building the AI operating system for consumer lending. We partner with some of America's largest mortgage lenders to transform their contact centers and compliance operations with AI voice agents. Backed by Y Combinator, Commerce Ventures, and executives from Snapdocs, Google, and WePay, we're redefining how millions of borrowers interact with financial institutions and how lenders operate at scale. This is a rare chance to join at the ground floor of a company already plugged into large-scale customers and real production use cases. WHAT YOU'LL DO - Architect and own core systems that power real-time AI voice and compliance workflows - Push performance boundaries, delivering sub-700ms latency leveraging event driven architecture and parallel processing - Deploy, operate, scale, resilient systems using Kubernetes and distributed sub-systems - Build a self-improving AI system that improves with every customer interaction and human feedback - Ship fast, ship right from whiteboard design to live production in bank environments. WHY JOIN KASTLE? - Build what banks run on: Your code won't sit in a sandbox, it'll power real borrower interactions at scale. - Act like a founder: High ownership, autonomy, and input on product, tech, and culture. - Learn fast: Daily exposure to customers and their feedback loops. - Strong upside: Competitive salary, meaningful early-stage equity, and a front-row seat to building a category-defining company. - Great team: Work side-by-side with a world-class founding team from Verkada, NVIDIA, Apple, and Redfin. WHAT YOU BRING - Strong

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